environmental impact assessment...
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142 IDA, Phase-II, Cherlapally, Hyderabad500 051
[email protected], www.vimta.com
(NABET - QCI Accredited, NABL Accredited & ISO 17025 Certified Laboratory,
Recognized by MoEF, New Delhi)
Prepared by :
November, 2016
Sponsor :
M/s. Oil and Natural Gas Corporation Ltd.Assam & Assam Arakan Basin,
Cinnamara, Jorhat 785 704
ENVIRONMENTAL IMPACT ASSESSMENT STUDIES FOR
THE PROPOSED DRILLING OF 8 EXPLORATORY WELLS IN PML AREAS
OF NAS BLOCK IN SIBSAGAR DISTRICT, ASSAM
FINAL REPORT
M/s. Oil and Natural Gas Corporation Ltd. Assam & Assam Arakan Basin,
Cinnamara, Jorhat - 785704
ENVIRONMENTAL IMPACT ASSESSMENT STUDIES FOR
THE PROPOSED DRILLING OF 8 EXPLORATORY WELLS IN PML AREAS OF
NAS BLOCK IN SIBSAGAR DISTRICT, ASSAM
For and on behalf of VIMTA Labs Limited
Approved by : M. Janardhan
Signature :
Designation : Head & Vice President (Env)
Date : November , 2016
The report has been prepared inline with the prescribed TORs issued vide No.
F.No.J-11011/343/2014-IA II (I) dated 22nd June, 2015 of Ministry of Environment
and Forests, New Delhi.
This report has been prepared by Vimta Labs Limited with all reasonable skill,
care and diligence within the terms of the contract with the client,
incorporating our General Terms and Conditions of Business and taking
account of the resources devoted to it by agreement with the client.
PREFACE
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
Table of Contents
VIMTA Labs Limited, Hyderabad TC-1
Table of Contents ________________________________________________________________ Chapter Title Page ________________________________________________________________
Table of Contents TC-1 List of Figures TC-4 List of Tables TC-5 1.0 Introduction 1.1 Purpose of the Report C1-1 1.2 Identification of Project & Project Proponent C1-1 1.3 Brief Description of the Project C1-2 1.4 Scope of the Study C1-16 2.0 Project Description 2.1 Introduction C2-1 2.2 Type of Project C2-1 2.3 Need for Exploratory Drilling C2-1 2.4 Project Location and Layout Details C2-1 2.5 Size or Magnitude of Operation C2-3 2.6 Proposed Schedule for Project Approval and
Implementation C2-8 2.7 Technology and Drilling Process Description C2-8 2.8 Details of Project Utilities C2-11 2.9 Post Drilling Operations Abandonment and Restoration C2-16 2.10 Sources of Pollution C2-17 2.11 Qualifications, Skills and Training Practice C2-21 3.0 Baseline Environmental Status
3.1 Introduction C3-1 3.2 Hydrogeology and Geomorphology C3-1 3.3 Land use Studies C3-10 3.4 Soil Characteristics C3-16 3.5 Meteorology C3-20 3.6 Ambient Air Quality C3-32 3.7 Water Quality C3-38 3.8 Noise Level Survey C3-46 3.9 Ecological Studies C3-50 3.10 Demographic and Socio-economic need based assessmentC3-64
4.0 Impact Assessment and Mitigation Measures 4.1 Impact Assessment C4-1 4.2 Anticipated Impacts from the Project C4-2 4.3 Environment Management Plan C4-23 4.4 Monitoring Environmental Performance C4-30 4.5 Emergency Response and Contingency Planning C4-31
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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VIMTA Labs Limited, Hyderabad TC-2
Table of Contents (Contd.) ________________________________________________________________ Chapter Title Page ________________________________________________________________
4.6 Waste Management Plan C4-37 4.7 Drilling Site Restoration Plan C4-38 5.0 Analysis of Alternatives 5.1 Alternative for Technology C5-1 5.2 Alternatives for Project site C5-1 6.0 Environmental Monitoring Programme 6.1 Introduction C6-1 6.2 Environmental Monitoring and Reporting Procedure C6-1 6.3 Reporting Schedule of the Monitoring Data C6-3 6.4 Infrastructure for Monitoring of Environmental Protection Measures C6-3 6.5 Environmental Costs C6-4 6.6 Audit and Review C6-4
7.0 Additional Studies 7.1 Public Consultation C7-1
7.2 Risk Assessment C7-1 7.3 Recommendations to Mitigate Risk/Hazards C7-11 7.4 Disaster Management Plan C7-12 7.5 Emergency Response Action C7-18 7.6 Emergency Response Procedures C7-19 7.7 End of Emergency C7-36 7.8 Communications C7-37
8.0 Project Benefits 8.1 Improvement in the Physical Infrastructure C8-1 8.2 Improvement in the Social Infrastructure C8-1 8.3 Employment Potential C8-2 9.0 Administrative Aspects
9.1 Operational Philosophy C9-1
9.2 Health Safety and Environment C9-2 9.3 Environmental Organization and Personnel C9-4
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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VIMTA Labs Limited, Hyderabad TC-3
Table of Contents (Contd.) ________________________________________________________________ Chapter Title Page ________________________________________________________________
10.0 Summary and Conclusion
10.1 Location Details of the Project C10-1 10.2 Importance of the Proposed Project C10-2 10.3 Details of Exploration Drilling Operations C10-2 10.4 Baseline Environmental Status C10-3 10.5 Impact Assessment C10-5 10.6 Environment Management Plan C10-7 10.7 Environmental Monitoring Program C10-9 10.8 Risk Assessment and Disaster Management Plan C10-9 10.9 Project Benefits C10-9 10.10 Administrative Aspects C10-10 10.11 Conclusions C10-10
11.0 Disclosure of Consultants
11.1 Introduction C11-1 11.2 Vimta Labs Limited C11-1
List of Annexures
Annexure-I Terms of Reference Letter and Compliance Annexure-II Applicable Environmental Standards Annexure-III Methodology for Sampling and Analysis Annexure-IV Forest Clearance Letter Annexure-V Land use Pattern Annexure-VI Ambient Air Quality Levels Annexure-VII Demographic Details Annexure-VIII Emission Calculations Annexure-IX Public hearing minutes of the meeting Annexure-X Pool Fire Calculations Annexure-XI Secondary Data for Risk Analysis Annexure-XII Existing CSR Budget Annexure-XIII Corporate Environment Policy
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
Table of Contents
VIMTA Labs Limited, Hyderabad TC-4
List of Figures ________________________________________________________________ Figure Title Page ________________________________________________________________
1.1 Index Map C1-5 1.2 Topographic Map NAS Block in Sibsagar District C1-6
1.3 Google Map Showing Well Locations in NAS Block C1-7 2.1 Typical Layout of Well Site C2-5 2.2 Drilling Rig C2-10 2.3 Drilling Fluid Circulation System at Typical Rig C2-15 2.4 Typical Section View of Drilling Cut and Drill Mud
Collection Pit C2-20
3.2.1 Hydrogeology Map of Sibsagar District C3-5 3.2.2 Seismic Zone Map of India C3-8 3.2.3 Flood Hazard Map of Sibsagar District C3-9
3.3.1 Satellite Imagery of the Study Area C3-14 3.3.2 Landuse Imagery of Study Area C3-15 3.4.1 Soil Sampling Locations C3-17 3.4.2 Photographs of Soil Sampling C3-18 3.5.1 IMD Golaghat Pre Monsoon Season C3-25 3.5.2 IMD Golaghat Monsoon Season C3-26 3.5.3 IMD Golaghat Post Monsoon Season C3-27 3.5.4 IMD Golaghat Winter Season C3-28 3.5.5 IMD Golaghat- Annual Windrose C3-29 3.5.6 Site Specific Windrose Winter Season C3-31 3.6.1 Air Quality Sampling Locations C3-35 3.6.2 Photographs of Ambient Air Quality Sampling C3-36 3.7.1 Water Sampling Locations C3-40 3.7.2 Photographs of Surface & Ground water sampling C3-41 3.8.1 Noise Monitoring Locations C3-47 3.8.2 Noise Monitoring Photographs C3-48 3.9.1 Ecological Sampling Locations C3-54 4.1 Short Term 24 hourly GLCs of SO2 C4-10 4.2 Short Term 24 hourly GLCs of NOx C4-11 4.3 Noise Level Contours C4-19
7.1 Objectives of Risk Assessment C7-4 7.2 Methodology of MCA Analysis C7-5 7.3 Flow Chart for Evaluation of Consequences during the
Release of Flammable or Toxic Chemical C7-8 7.4 Emergency Classification C7-14 7.5 Contingency Plan for Onshore Blowout (Drilling Rig) C7-20 7.6 Typical Schematic of BOP Stack C7-23 9.1 Organizational Structure for Environmental Management C9-6
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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VIMTA Labs Limited, Hyderabad TC-5
List of Tables
Tables Title Page
1.1 Block Coordinates C1-3 1.2 Tentative Well Locations C1-4 1.3 Environmental Setting of Well GKBS (1 Km Radius) C1-8 1.4 Environmental Setting of Well GKBS (1-Km Radius) C1-9 1.5 Environmental Setting of Well MKAD (1 Km Radius) C1-10 1.6 Environmental Setting of Well NGAB (1-Km Radius) C1-11 1.7 Environmental Setting of Well DGAJ (1 Km Radius) C1-12 1.8 Environmental Setting of Well LKBB (1 Km Radius) C1-13 1.9 Environmental Setting of Well CHAQ (1 Km Radius) C1-14 1.10 Environmental Setting of Well CHAR (1 Km Radius) C1-15 1.11 Environmental Attributes and Frequency of Monitoring C1-18 2.1 Tentative Well Locations C2-2 2.2 Salient Features of the Proposed Exploratory Drilling wells in NAS Block of Assam C2-3 2.3 Typical Water Requirements per Well Site C2-4 2.4 Details of DG Sets C2-6 2.5 Constituents of Water Based Mud (WBM) C2-6 2.6 Special Additives and Their Functions in Water Based Mud C2-7 2.7 Composition and Parameters of Water Based Drilling Mud C2-7 2.8 Hole Size and Casing Details C2-9 3.2.1 The Dynamic Groundwater Resources of Sibsagar District As On 31.03.2011 C3-4 3.2.2 Significant Earthquakes in Assam C3-6 3.2.3 Flood History of Assam C3-7 3.3.1 Landuse Pattern in the Study Area C3-10 3.3.2 Landuse /Land Cover Classification System C3-12 3.3.3 Land Use Break Up of the Study Area C3-13 3.4.1 Details of Soil Sampling Locations C3-16 3.4.2 Soil Analysis Results C3-19 3.4.3 Standard Soil Classification C3-20 3.5.1 Sensitivity of Meteorology Monitoring Equipment C3-21 3.5.2 Climatological Data Station IMD, Golaghat (1951-1980) C3-22 3.5.3 Summary of the Meteorological Data Generated at Site C3-30 3.6.1 Details of Ambient Air Quality Monitoring C3-33 3.6.2 Summary of Ambient Air Quality Results C3-37 3.7.1 Details of Water Sampling Location C3-39 3.7.2 Surface Water Quality C3-43 3.7.3 Ground Water Quality C3-45 3.8.1 Details of Noise Monitoring Location C3-49 3.8.2 Noise Levels in the Study Area C3-49 3.8.3 Ambient Noise Standards C3-50 3.9.1 Forest Blocks within Study Area C3-51 3.9.2 Details of Proposed Oil Drilling Locations C3-52 3.9.3 Details of Terrestrial Ecological Sampling Locations C3-52 3.9.4 Plant Species Recorded in Block Area C3-55 3.9.5 List of Agricultural Crops C3-58 3.9.6 List of Fauna around the Project area C3-59 3.9.7 Details of Aquatic Sampling Locations C3-62
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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VIMTA Labs Limited, Hyderabad TC-6
List of Tables (Contd)
Tables Title Page
3.9.8 List of Phytoplankton Species Identified from Study Area C3-63 3.9.9 List of Zooplankton Species Identified from Study Area C3-63 3.9.10 List of Species of Fishes Found in the Study Area C3-63 3.10.1 Distribution of Population in the study area C3-65 3.10.2 Distribution of Population by Social Structure C3-66 3.10.3 Distribution of Literate and Literacy Rates C3-66 3.10.4 Occupational Structure C3-67 3.10.5 Educational Facilities in the Study Area C3-68 3.10.6 Health Facilities in the rural villages of the study area C3-69 3.10.7 Drinking water facility in the rural villages of the study area C3-70 3.10.8 Communication Infrastructure on the NAS block area C3-70 3.10.9 Availability of power supply in the NAS block area C3-71 4.1 Summary of Impact Assessment: Soil and Landuse C4-4 4.2 Details of DG Sets C4-7 4.3 Emission Characteristics Model Inputs C4-8 4.4 Predicted 24 Hourly Short Term Incremental Concentrations C4-8 4.5 Resultant Concentrations due to Incremental GLCs C4-9 4.6 Summary of Impact Assessment: Water Resources C4-15 4.7 Input Data for Noise Modeling C4-17 4.8 Predicted Noise Levels C4-18 4.9 Noise Exposure Levels & Its Effects C4-18 4.10 Summary of Impact Assessment: Flora and Fauna C4-21 4.11 Summary of Environmental Management Actions C4-32 6.1 Schedule of Environmental Monitoring C6-2 7.1 List of Major Hazards C7-3 7.2 Occupational Hazards C7-3 7.3 Damage due to Peak over Pressure C7-6 7.4 Damage due to Incident Radiation Intensities C7-6 7.5 Input Data for Consequence Analysis C7-7 7.6 Summary of Consequence Analysis for Jet Fire Scenario at Well C7-9 7.7 Probability of Ignition for Leaks of Flammable Fluids C7-10 7.8 The Adnoc Individual Risk Assessment Criteria C7-10 7.9 Recommendations to Mitigate Blow out Risk/Hazards C7-11
142 IDA, Phase-II, Cherlapally, Hyderabad500 051
[email protected], www.vimta.com
(NABET - QCI Accredited, NABL Accredited & ISO 17025 Certified Laboratory,
Recognized by MoEF, New Delhi)
Prepared by :
November, 2016
Sponsor :
M/s. Oil and Natural Gas Corporation Ltd.Assam & Assam Arakan Basin, Dhansiri Bhavan,
Cinnamara, Jorhat - 785704
ENVIRONMENTAL IMPACT ASSESSMENT STUDIES FOR
THE PROPOSED DRILLING OF 8 EXPLORATORY WELLS IN
PML AREAS OF NAS BLOCK IN SIBSAGAR DISTRICT, ASSAM
EXECUTIVE SUMMARY
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-1
1.0 EXECUTIVE SUMMARY
Oil and Natural Gas Corporation Limited (ONGC) proposes to carryout
exploratory drilling in PML areas of North Assam Shelf (NAS) block in Sibsagar
district, Assam. Out of the proposed 8 exploratory drilling wells, 2 exploratory
drilling wells falls in Charali ML area, 4 exploratory drilling wells falls in Geleki, SE
Geleki & Mekeypore-Santak-Nazira ML area and 2 exploratory drilling wells in
Lakwa ML area of Sibsagar district, Assam.
As per the Environment Impact Assessment (EIA) Notification dated 14th
September, 2006, the proposed exploratory drilling project falls under Category
A of Activity Type 1(b). The EIA Report is prepared considering the TOR received
from MoEF vide letter reference F.No. J-11011/343/2014-IA II (I) dated 22nd
June, 2015.
This EIA Report is prepared inline with the ToR issued by MoEF&CC and addresses
the anticipated environmental impacts of the proposed project and proposes the
mitigation measures for the same for obtaining Environmental Clearance (EC)
from MoEF&CC, New Delhi. The report covers the primary data collected during
15th January 2016 to 8th April 2016 representing partly winter and pre monsoon
season.
1.1 Project Description
1.1.1 Location Details of the Project
Charali Mining Lease (ML) is one of the important oil producing fields of ONGC
situated in Sibsagar District of Assam. The area of this lease is 51.63 km2. This
ML area forms the part of North Assam shelf and had been producing
hydrocarbons for more than three decades from Barails and Tipams. A 20 years
ML was obtained with effect from 20.03.1999 (Ref: MOPNG, Govt. of India, Letter
No. O-12012/94/2002-ONG/D-IV, dated 29th April-2002) and is valid upto
19.03.2019. So far, 46 numbers of wells (including exploratory wells and
development wells) have been drilled in this field with depths ranging from 2400
m to as deep as 4000 m.
Geleki and its satellite fields Mekeypore, Santak & Nazira are some of the
important oil producing fields of ONGC situated in Sibsagar District of Assam.
These areas form the part of North Assam shelf and had been producing
hydrocarbons for more than three decades from Barails and Tipams.
ONGC has received Mining Lease of these areas from MOPNG, Govt of India for
exploring and producing hydrocarbons. The Mining Lease (ML) areas with their
respective validity are given below:
1. Geleki ML (Area: 27.94 sq.km, with effect from 16.08.1990 to 15.08.2030)
2. SE Geleki ML (Area: 20.5 sq.km, with effect from 30.01.2006 to 29.01.2026)
3. Mekeypore-Santak-Nazira ML (Area: 77.0 sq km, with effect from 30.01.2006
to 29.01.2026)
Lakwa Mining Lease (ML) contains important oil producing fields of ONGC situated
in Sibsagar District of Assam. The area of this lease is 172.49 square kilometers.
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-2
This ML area forms the part of North Assam shelf and has been producing
hydrocarbons for more than three decades from Barails and Tipams. A 20 years
ML has been obtained with effect from 29.09.2008 and is valid upto 28.09.2028.
So far, 681 numbers of wells (including exploratory and development wells) have
been drilled in this mining lease with depths ranging from 2259 m to as deep as
5113 m.
The area has undulating terrain with tea gardens. Elevation of the block varies
from 101 m to 104 m. The block coordinates are given in Table-1. Tentative well
coordinates are as given in Table-2.
TABLE-1
BLOCK COORDINATES
Sr. No ML Name Boundary Points Well Coordinates (WGS-84)
Latitude Longitude
1 Geleki ML (27.94 sq.km)
I 2604920.06 9404406.54
Z 2604911.88 9404143.98
Y 2604750.92 9404028.25
U 2604637.32 9404014.88
V 2604625.87 9404135.07
W 2604646.31 9404415.45
2 SE Geleki ML (20.5 sq.km)
A 2604614.8 940390.00 B 2604415.0 940390.00 C 2604400.0 940400.00 D 2604415 940410.00 E 2604515 940430.00 F 2604636.72 940430.00 G 2604631.59 9404219.62 H 2604543.24 9404056.71 I 2604537.5 9403930.71 J 2604628.68 9403942.21 A 2604614.8 940390.00
3 MK-SN-NZ-ML (77.00 Sq.Km)
Part-I (12.00 Sq.km)
A 2605713.88 9404316.45 B 2605713.84 9404430.0 C 2605330.00 9404330.0 D 2605327.46 9404041.61 E 2605647.00 9404326.45 A 2605713.88 9404316.45
Part-II
(57.00 Sq.km)
F 2605430.00 940470.00 G 2605230.00 940480.00 H 2604722.00 9404415 I 2604920.06 940446.54 J 2604911.88 9404143.98 K 260500.00 9404132.23 F 2605430.00 940470.00
4 Charali ML (51.63 Sq.Km)
A 2605619.90 9403935.68 B 2605622.50 94039.40.86 C 2605831.00 94039.38.86 D 2605903.57 9404322.83 E 2605647.00 9404326.45 F 2605327.46 9404041.61 G 2605310.28 9403808.36
5 Lakwa ML (172.49 Sq.Km)
A 2705957.75 9404317.57
B 2700016.00 9404541.00
C 2700112.75 9404601.29
D 270050.00 9405433.50
E 270050.00 9405638.00
F 2700001.25 9405559.86
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-3
Sr. No ML Name Boundary Points Well Coordinates (WGS-84)
Latitude Longitude
G 2605908.00 9405411.86
H 2605904.00 9405242.71
I 2605836.75 9405209.50
J 2605836.50 9405050.00
K 2605750.50 9404701.71
L 2605713.75 9404701.00
M 2605713.88 9404316.50
TABLE-2
TENTATIVE WELL LOCATIONS
Sr. No Proposed
Location
Well Coordinates (WGS-84) Nearest Village District
Latitude Longitude
1 GKBS 26o4531.82N 94o4005.54E Existing Geleki Block
Sibsagar,
Assam
2 GKBT 26o4741.65N 94o4304.71E Moran Gaon, Mouza - Athkhel
Sibsagar, Assam
3 MKAD 26o5203.991N 94o4647.221E Village Sundar Pukhuri Hulal gaon, Mouza - Juktoli
Sibsagar, Assam
4 NGAB 26o4945.130N 94o4600.093E Village Harkina Mouza Athkhel
Sibsagar, Assam
5 DGAJ 26o5814.69N 94o4634.70E
Village -Jojoli Gaon, Mouza Silakuti/Mahmora
Sibsagar, Assam
6 LKBB 27o0141.296N 94o4953.111E Village Kotoky Papong Mouza - Khaloighugura
Sibsagar, Assam
7 CHAQ 26o5612.73N 94o4111.13E Mothiasiga, Mouza - Juktoli, Sibsagar.
Sibsagar, Assam
8 CHAR 26o5751.849N 94o4023.018E Village Kurulakatia Mouza Meteka, Bongaon ,Sibsagar, Assam
Sibsagar, Assam
The study area map showing the block location and exploratory drilling well
locations are shown in Figure-1.
The details of environmental setting of the project block area are given below.
There is a reserve forest block (Geleki RF) within the study area.
The major water bodies in the project block area are Deopani nadi & Jhansi river
The project block is connected through National Highways NH-61 and Tuli railway station, Nemtiah railway station, Santak railway station and Nazira
railway station to rest of the region;
No archaeologically important places are present within project block as per Archaeological Survey of India (ASI) records; and
The block area falls under Seismic ZoneV as per IS: 1893 (Part-1) 2002.
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-4
FIGURE-1
TOPOGRAPHIC MAP NAS BLOCK IN SIBSAGAR DISTRICT
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-5
1.1.2 Importance of the Proposed Project
India is not among the major producers of crude oil, as it doesnt have much oil
reserves. Therefore, India generally depends on imports of crude oil from other
countries. There is a heavy imbalance between oil production and consumption in
India. The Indian government is encouraging exploration and production of oil
and gas to a great extent. This would primarily allow India to tap its own
resources there by reducing its import bill.
Discovery of viable hydrocarbon reserves in the state can boost the states
economic development to a great extent. The proposed exploration project is thus
of immense significance for the state.
1.1.3 Details of Exploration Drilling Operation
It is proposed to drill eight exploratory wells in the delineated area selected
through seismic survey to identify and establish hydrocarbon potential. The
proposed project intends to identify the presence of hydrocarbon prospects
through exploratory drilling and to delineate and quantify hydrocarbon pools in
discovered fields through appraisal drilling. The wells will be drilled upto a target
depth of about 3500 m by using water-based drilling mud only.
1.1.4 Infrastructure Requirement
Project Cost: The estimated cost of the proposed exploration well drilling per each
well would be approximately Rs. 40 Crores and total of Rs. 320 crores for eight exploratory drilling wells
Land Requirement: Minimum land required at each well site during drilling will be
125 m x 125 m, i.e., 1.56 ha. On an average, the land requirement at each well
site, including site facilities and camp site is considered as 1.5-2.25 ha. The land will
be acquired on a temporary basis and adequate compensation as per the guidelines
of local administration will be provided.
Power Requirement: The total power requirement at the drilling site will be 2250
KVA. The power requirement in the drilling site will be catered through Diesel
Generator (DG) sets. The power requirement will be met by 3 Nos of 750 KVA DG
sets at drilling site. Stand by DG set arrangement of 750 KVA at drilling site will be
made.
Water Requirement: Water is basically required for preparing drilling mud and for
meeting domestic needs of the campsite. Typically, the water consumption for each
well ranges from 20-25 m3/day for a short period of 4-5 months. However, the
drilling and domestic water requirement would depend on the time required to
drill the well, which is primarily dependent on the proposed depth.
Man Power: The drill site construction would be done largely employing local
labour. At each drill site construction, local employment will be generated for
about 30 person/shift of 12 hrs. in two shifts.
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-6
1.2 Description of the Environment
Environmental baseline data survey has been carried within the entire NAS block,
during 15th January 2016 to 8th April 2016 covering winter and partly pre-
monsoon season covering
1.2.1 Land Use Studies
The land use pattern of the NAS block has been studied by District Census Hand
Books and satellite images. It is observed that no forest land falls under the block
area and 3.56 % of the land falls under cultivable waste land. On the other hand,
59.44 % of land falls under unirrigated area. The area not available for cultivation
is about 7.75 % forms the bulk of the land use.
1.2.2 Soil Quality
The soil samples were tested at 11 locations during winter season covering
various land uses. It has been observed that the pH of the soil ranged from 7.18
8.01 indicating that is slightly alkaline to moderately alkaline in nature. The
electrical conductivity was recorded as 175 S/cm to 358 S/cm. The organic
carbon content in the study area observed as 0.25 % to 0.72 %, which the soil
falls under medium to on an average sufficient category. The phosphorus values
ranged between 19.5 58.7 kg/ha. The nitrogen values ranged between 24.5
59.6 kg/ha. The potassium values ranged between 85.1 168.7 kg/ha.
1.2.3 Meteorology
On-site monitoring was undertaken for various meteorological variables in order
to generate the site-specific data. The data generated is then compared with the
meteorological data generated by nearest India Meteorological Department (IMD)
stations located at Golaghat. The meteorological data generated at the monitoring
site when compared with the data recorded at nearest IMD station, it is observed
that the data generated at the site is broadly in comparison with regional
meteorology, except for minor variations.
1.2.4 Ambient Air Quality
To establish the baseline status of the ambient air quality in the study area, the
air quality was monitored at 11 locations during partly winter and partly pre-
monsoon season of 2016. Out of the eleven locations the minimum and maximum
concentration for PM10 were varied between 30.0 to 51.8 g/m3 during the study
period which are well within the NAAQ standard i.e 100 g/m3.
The minimum and maximum concentration for PM2.5 were varied between 12.6 to
17.2 g/m3 during the study period which are well within the NAAQ standard i.e
60 g/m3 .The concentration of SO2 were varied between 10 to 16.5 g/m3 during
the study period which are well within the NAAQ standard i.e 80 g/m3.The
concentrations of NOx were varied between 12.1 to 20.8 g/m3 during the study
period which are well within the NAAQ standard i.e 80 g/m3.
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-7
The minimum and maximum concentration for CO were varied between 185-296
g/m3 during the study period which are well within the NAAQ standard i.e 2000
g/m3.
The minimum and maximum concentration for total hydrocarbons, methane
hydrocarbons and non-methane hydrocarbons during the study period were
observed as 195 to 300 g/m3, 99 to 164g/m3 and 70 to 137 g/m3 respectively.
The concentrations of VOCs were below the detectable limits in all the locations
during the study period. From the analysis of the monitored data, it infers that the
air quality levels in the study area are of fairly good quality and comply with the
National Ambient Air Quality Standards.
1.2.5 Water Quality
The baseline water quality status in the region is established by analyzing about 7
ground water samples and 6 surface water samples during study period.
The physico-chemical and biological analysis revealed that most of the parameters
in ground water samples are well within the permissible limits when there is no
alternative choice as per IS: 10500. The physico-chemical and biological analysis
revealed that all the parameters in surface water samples are well within the
prescribed limits of IS: 10500 limits.
1.2.6 Ambient Noise Levels
The noise monitoring has been conducted at 11 locations, covering residential,
commercial and silence zones in the study area. A review of this data indicates that
at all the locations, the noise level was found within the permissible limits of CPCB.
1.2.7 Ecological Environment
An ecological survey in the study area was conducted particularly with reference to
the listing of species and assessment of the existing baseline ecological (Terrestrial
and Aquatic ecosystem) conditions in the study area. There are no reserved forest
and national park present inside the block area.
Hoollongapar Wildlife Sanctuary is located at 23 Km in WSW direction from the
block boundary. The sanctuary has an area of 2098.62 ha. The sanctuary area is
endowed with medicinal herbs and wide variety of plants and characteristic fauna in
the sanctuary is the presence of Holoock gibbon and apart from the presence of
elephants and other reptilian species such as phyons.
Distance wise and direction from the cluster of the drilling wells from the
Hoolongapar Gibbon Wildlife Sanctuary. Gibbons are endangered species, as per
wildlife protection act 1972 listed in Schedule I species and are only apes found in
India.
During the floristic survey, a total of 128 plant species were recorded which
consists of 83 tree species, 23 shrub species, 17 herb species, 4 climbers and 1
parasites were recorded from the study area.
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-8
1.2.8 Socio-Economic Environment
The configuration of male and female indicates that the males constitute about
51.09% and females to 48.91% of the total population as per 2011 census
records. The study area on an average has 957 females per 1000 males.
In the study area, as per 2011 census, 1.72 % of the population belongs to
Scheduled Castes (SC) and 1.68 % to Scheduled Tribes (ST).
The percentage of literates to total population is 81.97 %. As per census records
the total work participation in the project study area is 41.27% and the non-
workers constitute 58.73 % of the total population respectively. The distribution
of workers by occupation indicates that the non-workers are the predominant
population. The main workers to the total workers are 60.66% and the marginal
workers constitute to 39.34% to the total workers.
1.3 Anticipated Environmental Impacts
The identification and assessment of impacts over the various environmental
attributes in the region due to the proposed exploratory drilling activities in the
project block have been discussed followed by mitigative measures and
environmental management plan for the potential impacts due to the proposed
project activities.
The proposed exploratory drilling activities will last for 4 to 5 months and hence
the impact due to the project are temporary and reversible in nature and will be
localised.
1.3.1 Impact on Topography and Land Use
Considering the small foot print area required during the drilling, only marginal
impact due to change in land use is anticipated and there is no topographical
change is envisaged.
1.3.2 Impact on Climate
Impact on the climatic conditions from the drilling will not be significant.
Considering the quantum of exit gas and the short duration of flow, the impact on
the local or global climate will be insignificant.
1.3.3 Impact on Air Quality
The potential sources of air emissions at the well sites will be as follows:
Dust from earth works (during approach road and site preparation); Emissions from DG sets; Emissions from possible flaring during well testing; and Emissions from vehicles
During the short period of site preparation, mechanical shovels and earthmovers
will be used for vegetation clearance, cut and fill and other site leveling activities.
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-9
However, these activities will be only temporary and the impact to ambient air
quality would be within the close proximity of well site.
The gaseous emissions from the DG set will be controlled by efficient combustion
of fuel in the DG set. The flaring of oil and gas during well testing is a short
duration activity (about 14-21 days). The dimensions of the typical flaring pit
would be approximately 25 m x 10 m x 2 m deep will be used. The setting out of
the flare pit will be done in a manner to direct the flame away from any pockets
of cultivation / existing green cover. Wherever required, special precautions will
be taken to minimize the impact on the local environment and habitat.
1.3.4 Impact on Surface Water and Groundwater Quality
Approximately 15-20 m3/day of wastewater and 8 m3/day of sewage would be
generated from each well site. Water based non-toxic biodegradable fluids with
inhibitive and encapsulative characteristics are proposed to be used as drilling
mud for minimizing any long term impact on groundwater quality.
Additionally, the drilling mud collection and recirculation pond is lined with
impervious layer to prevent seepage and loss of drilling fluid into the subsoil.
Further, proper casing installation and cementing of well will ensure least
groundwater contact. The clarified wastewater will be treated in packaged
treatment plant located at the well sites to meet norms specified by CPCB and
ASPCB. The sewage will be discharged into septic tanks and then to subsoil
through soak pits.
1.3.5 Impact on Noise Levels
The maximum predicted noise level at about 100 m from the boundary of the drill
site is about 52.0 dB (A). The ambient noise levels at most of the places in the
region are within the CPCB standards. Since, the drilling operations last for only
120-150 days at each location, impact of the noise due to the proposed
exploratory drilling will be insignificant on the community and will be minimized
after 100 m from drilling well site boundary.
1.3.6 Ecological Impacts
Impact on the ecology of the study area will vary with the proximity of the
habitats from the drilling locations. However, the impacts are of temporary
nature, which will last for few days at each drill location during the exploratory
drilling activities and will thus allow subsequent recovery after the activities
stops.
1.3.7 Demography and Socio-Economics
Although the level of existing communications and support services in the area
are considered adequate based on the population density, establishment of the
proposed project would further strengthen the road network and access to some
of the remote areas with all-weather roads would be of distinct beneficial impact.
The overall impact is considered to be positive.
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-10
Impact on health due to emissions and noise from drilling activity has been
assessed to be minimal. In addition employees working at the drill site would be
provided protective devices like ear plugs/ear muffs for ensuring minimum impact
on human health.
For most potential drilling sites in the exploration area, it should be possible to
avoid impact on existing arable land. By following the compensation procedures
and by observing common courtesy, impacts on existing use and benefit rights
holders can be minimized.
1.4 Environment Management Plan
1.4.1 Removal of Equipment and Materials
After completion of the drilling activities, the well will be capped with a wellhead
in place, but all other equipment and materials will be removed from the site. The
site would be returned to its original form in most environment friendly manner.
All empty drums, wastes, used and unused drilling fluids, fuel and lubricants will
be removed from the drilling site. Water supply and effluent discharge hoses and
associated equipment will be removed. The access road(s) would be reinstated.
1.4.2 Decommissioning upon Abandonment
In the event that no economic quantities of hydrocarbons are found, a full
abandonment plan will be implemented for the drilling sites in accordance with
the applicable Indian petroleum regulations. The well will be capped and the land
would be handed over back to the owners in the original form.
1.4.3 Atmospheric Emissions
The combustion of diesel for power generation for the drilling and campsite
operation results in atmospheric emissions of SO2, NOx, CO, Particulates and
Hydrocarbons. Flaring during production testing is of 14 to 21 days duration and
atmospheric emissions are marginal.
There will be no sensitive receptors to the emissions of combustion products in
the vicinity of the proposed drilling operations apart from the crew of the drilling
rig. The impacts caused are therefore, considered to be negligible. Measures to
ensure minimal impacts include appropriate management of power generation
source to achieve fuel efficiency and therefore reduce emissions and use of low
sulphur diesel oil. Environmental monitoring is proposed during drilling and well
testing to ensure maximum combustion efficiency. Flaring towards any standing
vegetation will be avoided. In case if it is inevitable, a suitable barrier will be
erected to prevent any vegetation scorching due to direct heat radiation; and
prior to flaring, the critical equipment will be thoroughly tested.
1.4.4 Noise Environment
The modeling results show that the noise levels will attenuate to below
permissible levels within the drilling site boundary. The Generators will be
properly enclosed and the exhausts will be provided with silencers.
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-11
1.4.5 Management of Drilling Wastes
The major waste product of a drilling operation is the generation of rock cuttings
with residual mud adhering to the drill cuttings and spent drilling fluid. About 500
m3 of drill cuttings per well and 15 m3 spent drilling fluid would need to be
disposed off.
ONGC proposes to use internationally followed methodologies while drilling with
Water Based Muds (WBM). The mud will be reused after its separation from the
cuttings. A mud mixing tank will be set up at the drilling site with a collection
system so that any spill of chemicals will be collected.
The spilled oil may be reused in the mud preparation. The residual drilling fluids
will be reused in the drilling campaign to the maximum extent and the drilling
fluid which can not be further used will be discarded as per procedure.
1.4.6 Management of the Solid Wastes
Small amounts of solid wastes will be generated during normal operation at the
drilling rig. The wastes will be disposed on compliance with local and national
legislations. Spent waste oil will be stored in a secure paved area and disposed to
MoEF/ CPCB approved waste oil recyclers. Drill cuttings and sludge from drilling
mud to be buried within the impervious lined pit and covered with soil as part of
the site abandonment plan. Biodegradable waste arising from kitchen and
canteen activities to be scientifically composted and the bio-manure so generated
to be used for green belt development.
1.4.7 Management of Waste Disposal sites within Drill Site
The project proponent is committed to dispose the drill cuttings, drill mud and
wastewater generated during the drilling operations into the lined pits of various
sizes and undertaking plantation within the drill site particularly on the reclaimed
pits will be undertaken.
1.5 Environmental Monitoring Program
A detailed post project monitoring in respect of air, water, soil, landuse,
occupational noise, etc. to assess the changes has been evolved covering various
phases of project advancement. A network of sampling locations around the drill
site will be established. The monitoring will include the compliances to legal and
statutory controls imposed on the operation as well as other corporate
commitment to responsible environment management. Systems for monitoring
resource inputs (energy, chemical use, water, raw materials), equipment and
waste generation will also be set up. A detailed wastes management plan with
monitoring programme will be in place during various phases of activity.
1.6 Risk Assessment and Disaster Management Plan
The hazard potential of oil and gas and estimation of consequences in case of
their accidental release during drilling has been identified and risk assessment
has been carried out to quantify the extent of damage and suggest
recommendations for safety improvement for the proposed facilities. Risk
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-12
mitigation measures based on MCA analysis and engineering judgments are
incorporated in order to improve overall system safety and mitigate the effects of
major accidents.
An effective Disaster Management Plan (DMP) to mitigate the risks involved has
been prepared. This plan defines the responsibilities and resources available to
respond to the different types of emergencies envisaged. Training exercises will
be held to ensure that all personnel are familiar with their responsibilities and
that communication links are functioning effectively.
1.7 Project Benefits
The proposed exploration program will establish hydrocarbons in the block. The
development of the oil field will result in considerable growth of service sector and
will also generate new industrial and business opportunities in the area. Small
and medium scale industries may be developed as consequence.
The major benefits of the project include reduction of the oil import bill of the
nation as well as reduction of the imbalance in oil production and consumption.
The commercial development will also lead to investment in Assam, bringing oil
and gas revenues both to the State and to the Central Government. The presence
of ONGC in the region will substantially improves the socio-economic conditions of
the region.
The proposed exploration drilling programme is expected to generate local
employment for unskilled and semi- skilled people, for a period of approximately
4-5 months at each drilling site location. While this benefit is small by most
standards, it is a significant employment opportunity in the block.
1.8 Administrative Aspects
The basis of the operational philosophy is that the activities proposed in oil and
gas processing shall be operated in complete compliance with all applicable Laws,
Regulations, Standards and Permits, the Production Sharing Contract (PSC),
corporate policies, procedures, specifications, rules, standards and guidelines. In
order to achieve this, the proposed drilling sites will be maintained by technically
qualified and experienced people. Detailed procedures and plans will be
developed for each activity prior to operations start up. All persons on board the
drilling rig will be an experienced crew with valid qualifications.
The HSE department of ONGC is the nodal agency to coordinate and provide
necessary services on environmental issues during construction and operation of
the project.
1.9 Conclusions
The proposed exploratory drilling project has certain level of marginal impacts on
the local environment. However, the proposed project has significant beneficial
impact/effects in terms of providing the employment opportunities and various
CSR practices to be followed by ONGC. Growth and development, in harmony
with the environment, has always been the approach of ONGC.
Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam
Executive Summary
VIMTA Labs Limited, Hyderabad ES-13
The conclusions of EIA are:
The proposed project will meet the compliance requirements of various environmental regulations;
Adoption of environmental friendly Best Management Practices results in minimising the impacts on environment;
Community impacts of the project will be beneficial, as the project will generate significant economic benefits for the region;
The post drilling, commercial developmental activities of ONGC can reduce the import burdens of crude oil on the nation; and
With the effective implementation of the Environment Management Plan (EMP) during the planning, design, construction and operation phases, the
development and production project can proceed without significant negative
impact on the environment.
AA-ONN-2009/3 NELP-VIII (EIA)
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Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
Chapter-1 Introduction
VIMTA Labs Limited, Hyderabad C1-1
1.0 INTRODUCTION
Oil and Natural Gas Corporation Limited (ONGC) proposes to carryout
exploratory drilling in PML areas of North Assam Shelf (NAS) block in Sibsagar
district, Assam. Out of the proposed 8 exploratory drilling wells, 2 exploratory
drilling wells falls in Charali ML area, 4 exploratory drilling wells falls in Geleki, SE
Geleki & Mekeypore-Santak-Nazira ML area and 2 exploratory drilling wells in
Lakwa ML area of Sibsagar district, Assam.
This chapter describes the purpose of the report, identification of project and
proponent, brief description of nature, size, location of the project and importance
to the region and country. The chapter also describes the scope of the study,
details of regulatory scoping carried out as per Terms of Reference (TOR) issued
by Ministry of Environment Forest and Climate Change (MoEF&CC), New Delhi.
1.1 Purpose of the Report
As per Environmental Impact Assessment EIA Notification dated 14th September,
2006, exploration of oil & gas falls under category A of project activity 1(b)
requires prior Environmental Clearance (EC) to be obtained from MoEF&CC before
the commencement of ground activity.
The application for prior EC (Form-1 and Pre-feasibility Report) for the proposed
project has been submitted to MoEF&CC on 29th December, 2014 and same was
reviewed by the Expert Appraisal Committee (Industry II) held during 16th 17th
March 2015 in New Delhi to prescribe Terms of Reference (TORs) for the
preparation of EIA/EMP report. TOR has been issued by MoEF vide letter reference
F.No. J-11011/343/2014-IA II (I) dated 22nd June, 2015. A copy of the ToR letter,
along with its compliance is enclosed as Annexure-I.
This EIA Report is prepared inline with the ToR issued by MoEF&CC and addresses
the anticipated environmental impacts of the proposed project and proposes the
mitigation measures for the same for obtaining Environmental Clearance (EC)
from MoEF&CC, New Delhi. The report covers the primary data collected during
15th January 2016 to 8th April 2016 representing partly winter and pre monsoon
seasons. Public Hearing for the proposed 8 exploratory drilling wells project has been
conducted on 04th October, 2016 and 6th October, 2016 by Assam State Pollution
Control (ASPCB) in accordance with TOR and the public hearing proceedings and
action plan have been included in this final EIA report.
1.2 Identification of Project and Project Proponent
Oil and Natural Gas Corporation Limited (ONGC) is a Public Sector Undertaking
(PSU) of the Government of India, under the administrative control of the Ministry
of Petroleum and Natural Gas. It is India's largest oil and gas exploration and
production company. It produces around 70% of India's crude oil (equivalent to
around 25% of the country's total demand) and around 60% of its natural gas.
With a market capitalization of over INR 2 trillion, it is one of India's most
valuable publicly-traded companies.
ONGC has been ranked 357th in the Fortune Global 500 list of the world's biggest
corporations for the year 2012. It is also among the Top 250 Global Energy
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
Chapter-1 Introduction
VIMTA Labs Limited, Hyderabad C1-2
Company by PLATTS. ONGC was founded on 14 August 1956 by the Indian state,
which currently holds a 69.23% equity stake. It is involved in exploring
hydrocarbons in 26 sedimentary basins of India, and owns and operates over
11,000 kilometers of pipelines in the country. Its international subsidiary, ONGC
Videsh currently has projects in 15 countries.
1.3 Brief Description of the Project
1.3.1 Nature of the Project
As per the Environment Impact Assessment (EIA) Notification dated 14th
September, 2006, the proposed exploratory drilling project falls under Category
A of Activity Type 1(b).
The proposed project intends to identify the presence of hydrocarbon prospects
through exploratory drilling and to delineate and quantify hydrocarbon pools in
discovered fields through exploratory drilling. The proposed project will basically
involve drilling of eight exploratory wells in the block.
1.3.2 Size of the Project
ONGC has identified eight well locations GKBS, GKBT, MKAD, NGAB, DGAJ, LKBB,
CHAQ and CHAR are included in present EIA study. It is proposed to drill eight
exploratory wells for the fulfillment of Minimum Work Program (MWP) and also to
evaluate potential of the entire block.
1.3.3 Project Site Details
1.3.3.1 Location of the Block
Charali Mining Lease (ML) is one of the important oil producing fields of ONGC
situated in Sibsagar District of Assam. The area of this lease is 51.63 km2. This
ML area forms the part of North Assam shelf and had been producing
hydrocarbons for more than three decades from Barails and Tipams. A 20 years
ML was obtained with effect from 20.03.1999 (Ref: MOPNG, Govt. of India, Letter
No. O-12012/94/2002-ONG/D-IV, dated 29th April-2002) and is valid upto
19.03.2019. So far, 46 numbers of wells (including exploratory wells and
development wells) have been drilled in this field with depths ranging from 2400
m to as deep as 4000 m.
Geleki and its satellite fields Mekeypore, Santak & Nazira are some of the
important oil producing fields of ONGC situated in Sibsagar District of Assam.
These areas form the part of North Assam shelf and had been producing
hydrocarbons for more than three decades from Barails and Tipams.
ONGC has received Mining Lease of these areas from MOPNG, Govt. of India for
exploring and producing hydrocarbons. The Mining Lease (ML) areas with their
respective validity are given below:
1. Geleki ML (Area: 27.94 sq.km, with effect from 16.08.2010 to 15.08.2030)
2. SE Geleki ML (Area: 20.5 sq.km, with effect from 30.01.2006 to 29.01.2026)
3. Mekeypore-Santak-Nazira ML (Area: 77.0 sq km, with effect from 30.01.2006
to 29.01.2026)
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
Chapter-1 Introduction
VIMTA Labs Limited, Hyderabad C1-3
Lakwa Mining Lease (ML) contains important oil producing fields of ONGC situated
in Sibsagar District of Assam. The area of this lease is 172.49 square kilometers.
This ML area forms the part of North Assam shelf and has been producing
hydrocarbons for more than three decades from Barails and Tipams. A 20 years
ML has been obtained with effect from 29.09.2008 and is valid upto 28.09.2028.
So far, 681 numbers of wells (including exploratory and development wells) have
been drilled in this mining lease with depths ranging from 2259 m to as deep as
5113 m.
The area has undulating terrain with tea gardens. Elevation of the block varies
from 101 m to 104 m. Index Map is shown in Figure-1.1. The block coordinates
are given in Table-1.1. Tentative well coordinates are as given in Table-1.2.
TABLE-1.1
BLOCK COORDINATES
Sr. No ML Name Boundary
Points
Well Coordinates (WGS-84)
Latitude Longitude
1 Geleki ML (27.94 sq.km)
I 2604920.06 9404406.54
Z 2604911.88 9404143.98
Y 2604750.92 9404028.25
U 2604637.32 9404014.88
V 2604625.87 9404135.07
W 2604646.31 9404415.45
2 SE Geleki ML (20.5 sq.km)
A 2604614.8 940390.00 B 2604415.0 940390.00 C 2604400.0 940400.00 D 2604415 940410.00 E 2604515 940430.00 F 2604636.72 940430.00 G 2604631.59 9404219.62 H 2604543.24 9404056.71 I 2604537.5 9403930.71 J 2604628.68 9403942.21 A 2604614.8 940390.00
3 MK-SN-NZ-ML (77.00 Sq.Km)
Part-I (12.00 Sq.km)
A 2605713.88 9404316.45 B 2605713.84 9404430.0 C 2605330.00 9404330.0 D 2605327.46 9404041.61 E 2605647.00 9404326.45 A 2605713.88 9404316.45
Part-II (57.00 Sq.km)
F 2605430.00 940470.00 G 2605230.00 940480.00 H 2604722.00 9404415 I 2604920.06 940446.54 J 2604911.88 9404143.98 K 260500.00 9404132.23 F 2605430.00 940470.00
4 Charali ML (51.63 Sq.Km)
A 2605619.90 9403935.68 B 2605622.50 94039.40.86 C 2605831.00 94039.38.86 D 2605903.57 9404322.83 E 2605647.00 9404326.45 F 2605327.46 9404041.61 G 2605310.28 9403808.36
5 Lakwa ML (172.49 Sq.Km)
A 2705957.75 9404317.57
B 2700016.00 9404541.00
C 2700112.75 9404601.29
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
Chapter-1 Introduction
VIMTA Labs Limited, Hyderabad C1-4
Sr. No ML Name Boundary
Points
Well Coordinates (WGS-84)
Latitude Longitude
D 270050.00 9405433.50
E 270050.00 9405638.00
F 2700001.25 9405559.86
G 2605908.00 9405411.86
H 2605904.00 9405242.71
I 2605836.75 9405209.50
J 2605836.50 9405050.00
K 2605750.50 9404701.71
L 2605713.75 9404701.00
M 2605713.88 9404316.50
TABLE-1.2
TENTATIVE WELL LOCATIONS
Sr. No Proposed
Location
Well Coordinates (WGS-84) Nearest Village District
Latitude Longitude
1 GKBS 264544.95N 944007.07E Existing Geleki
Block
Sibsagar,
Assam
2 GKBT 264745.65N 9443 03.90E Moran Gaon, Mouza Athkhel
Sibsagar, Assam
3 MKAD 265202.73N 944626.898E Village Sundar Pukhuri Hulal gaon, Mouza - Juktoli
Sibsagar, Assam
4 NGAB 264946.03N 94440.75E Village Harkina Mouza Athkhel
Sibsagar, Assam
5 DGAJ 2658 14.69N 944634.70E
Village -Jojoli Gaon, Mouza Silakuti/Mahmora
Sibsagar, Assam
6 LKBB 270141.296N 9449 53.111E
Village Kotoky Papong Mouza - Khaloighugura
Sibsagar, Assam
7 CHAQ 265612.73N 9441 11.13E Mothiasiga, Mouza - Juktoli, Sibsagar.
Sibsagar, Assam
8 CHAR 2657 51.849N 9440 23.018E
Village Kurulakatia Mouza Meteka, Bongaon ,Sibsagar, Assam
Sibsagar, Assam
The study area map showing the block location and exploratory drilling well
locations are shown in Figure-1.2. Google map showing block area with well
locations is given in Figure-1.3. The environmental setting of the block area
falling in NAS Block area is given in Table-1.3 to Table-1.10.
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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FIGURE-1.1
INDEX MAP
CHAQ CHAR
DGAJ
LKBB
MKAD NGAB
NAS Block CHAQ CHAR
DGAJ
LKBB
MKAD
GKBT
GKBS
NGAB
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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FIGURE-1.2
TOPOGRAPHIC MAP NAS BLOCK IN SIBSAGAR DISTRICT
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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FIGURE-1.3
GOOGLE MAP SHOWING WELL LOCATIONS IN NAS BLOCK
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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TABLE-1.3
ENVIRONMENTAL SETTING OF WELL GKBS (1 KM RADIUS)
Sr. No. Particulars Details
1 Well GKBS Location Village Existing Geleki Block
Mouza Ahtkhel
District Sibsagar
State Assam
2 Well site Coordinates Latitude : 2604544.95N Longitude : 940407.07E
3 Well Site Elevation above MSL 140 m above MSL 4 Geographical location in toposheet 83 J/9 5 Nearest representative IMD station IMD Golaghat (75 km, SW)
6 India Meteorological Dept. (IMD), Data-Golaghat
Annual Mean Max Temp 32.7C
Annual Mean Min Temp 15.5C
Annual Average Rainfall 1898.8 mm
Predominant wind direction
North West
Study Period Site specific
Mean Max Temp 32.4C
Mean Min Temp 5.9C
Average Rainfall 13.6
Predominant wind direction SE
7 Present land use at the site Industrial use. Land is already under possession of ONGC. (Forest clearance obtained and letter is enclosed as Annexure-IV)
8 Nearest highway NH-61 (5.7 km, SW) 9 Nearest railway station Tuli Railway station (5.9 km, SE) 10 Nearest airport Jorhat (50 km, WSW) 11 Nearest river Deopani nadi & Jhansi river (7.1 km, SW) 12 Nearest town Sibsagar (25 km, NNW) 13 Nearest major town with 2,00,000
population
NIL
14 Villages within 1 km radius NIL 15 Hills/valleys NIL 16 Nearest tourist place NIL 17 Archaeologically important places NIL 18 Protected areas as per Wildlife
Protection Act,1972 (Tiger reserve, Elephant reserve, Biospheres, National parks, Wildlife sanctuaries, community reserves and conservation reserves)
NIL
19 Reserved / Protected Forests Geleki RF 20 Seismicity Zone-V as per IS 1983 (Part-1) 2002
Note: All distances mentioned above are aerial distances
Source: Topo sheet No: 83 J/9, Google image and field visits
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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TABLE-1.4
ENVIRONMENTAL SETTING OF WELL GKBT (1-KM RADIUS)
Sr. No. Particulars Details
1 Well GKBT Location Village Moran Gaon
Mouza Athkhel
District Sibsagar
State Assam
2
Well site Coordinates Latitude : 26o4745.65N
longitude : 94o4303.90E 3 Well Site Elevation above MSL 100 m above MSL 4 Geographical location in
toposheet 83 J/9
5 Nearest representative IMD station
Golaghat (80.7 km, SW)
6 India Meteorological Dept. (IMD), Data- Golaghat
Annual Mean Max Temp 32.7C
Annual Mean Min Temp 15.5C
Annual Average Rainfall 1898.8 mm
Predominant wind direction
North West
Study Period - Site specific
Mean Max Temp 32.4C
Mean Min Temp 5.9C
Average Rainfall 13.6
Predominant wind direction
SE
7 Present land use at the site Single crop agricultural land 8 Nearest highway NH-61 (12.1 km, SW) 9 Nearest railway station Nemtiah Railway Station (10.8, NW) 10 Nearest airport Jorhat (54.6, WSW) 11 Nearest rivers Jhanzi river (12.2 km, SW) 12 Nearest town Sibsagar (22.6, NNW) 13 Nearest major town with
2,00,000 population Sibsagar (22.6, NNW)
14 Villages within 1 km radius Marangaon (0.9 km, NE) 15 Hills/valleys NIL 16 Nearest tourist place NIL 17 Archaeologically important places NIL 18 Protected areas as per Wildlife
Protection Act,1972 (Tiger reserve, Elephant reserve,
Biospheres, National parks,
Wildlife sanctuaries, community reserves and conservation reserves)
19 Reserved / Protected Forests NIL 20 Seismicity Zone-V as per IS 1983 (Part-1) 2002
Note: All distances mentioned above are aerial distances
Source: Topo sheet No: 83 J/9, Google image and field visits
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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TABLE-1.5
ENVIRONMENTAL SETTING OF WELL MKAD (1 KM RADIUS)
Sr. No. Particulars Details
1 Well MKAD Location Village Sundar Pukhuri Hulal gaon
Mouza Juktoli
District Sibsagar
State Assam
2 Well site Coordinates Latitude : 26o5202.73N Longitude : 94o4626.898E
3 Well Site Elevation above MSL 100 m above MSL 4 Geographical location in toposheet 83 J/13 5 Nearest representative IMD station Golaghat (90 km, SW)
6 India Meteorological Dept. (IMD), Data-Golaghat
Annual Mean Max Temp 32.7 C
Annual Mean Min Temp 15.5 C
Annual Average Rainfall 1898.8 mm
Predominant wind direction
North West
Study Period Site specific
Mean Max Temp 32.4C
Mean Min Temp 5.9C
Average Rainfall 13.6
Predominant wind direction
SE
7 Present land use at the site Single crop rain fed agricultural land 8 Nearest highway SH-1 (6.6 km, NW) 9 Nearest railway station Santak RS (1.5 km, ENE) 10 Nearest airport Jorhat (62 km, WSW) 11 Nearest river Dikhu river (Adjacent) 12 Nearest town Sibsagar (18.8, NW) 13 Nearest major town with 2,00,000
population Sibsagar (18.8, NW)
14 Villages within 1 km radius Sundar Pukhuri (0.6, W) 15 Hills/valleys NIL 16 Nearest tourist place NIL 17 Archaeologically important places NIL 18 Protected areas as per Wildlife
Protection Act,1972 (Tiger reserve, Elephant reserve, Biospheres, National parks, Wildlife sanctuaries, community reserves
and conservation reserves)
NIL
19 Reserved / Protected Forests NIL 20 Seismicity Zone-V as per IS 1983 (Part-1) 2002
Note: All distances mentioned above are aerial distances
Source: Topo sheet No: 83 J/9, Google image and field visits
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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TABLE-1.6
ENVIRONMENTAL SETTING OF WELL NGAB (1-KM RADIUS)
Sr. No. Particulars Details
1 Well NGAB Location Village Harkina Gaon
Mouza Athkhel
District Sibsagar
State Assam
2
Well site Coordinates Latitude : 26o4946.03N
Longitude : 94o440.75E
3 Well Site Elevation above MSL 105 m above MSL 4 Geographical location in
toposheet 83J/9
5 Nearest representative IMD station
Golaghat (84.7 km, SW)
6 India Meteorological Dept. (IMD), Data-Golaghat
Annual Mean Max Temp 32.7 C
Annual Mean Min Temp 15.5 C
Annual Average Rainfall 1898.8 mm
Predominant wind direction
North West
Study Period - Site specific
Mean Max Temp 32.4C
Mean Min Temp 5.9C
Average Rainfall 13.6
Predominant wind direction
SE
7 Present land use at the site Single crop agricultural land 8 Nearest highway SH-1 (7.4 km, NNW) 9 Nearest railway station Mezanga Railway station (7.5 km, NNW) 10 Nearest airport Jorhat (56.7 km, WSW) 11 Nearest rivers Namdang Nadi (1.3, W) 12 Nearest town Sibsagar (20 km, NNW) 13 Nearest city Sibsagar (20 km, NNW) 14 Nearest major town with
2,00,000 population Sibsagar (20 km, NNW)
15 Villages within 1 km radius Hari kinagaon (0.6 km, NW) 16 Hills/valleys NIL 17 Nearest tourist place NIL 18 Archaeologically important places NIL 19 Protected areas as per Wildlife
Protection Act,1972 (Tiger
reserve, Elephant reserve, Biospheres, National parks, Wildlife sanctuaries, community reserves and conservation reserves)
NIL
20 Reserved / Protected Forests NIL 21 Seismicity Zone-V as per IS 1983 (Part-1) 2002
Note: All distances mentioned above are aerial distances Source: Topo sheet No: 83 J/9, Google image and field visits
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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TABLE-1.7
ENVIRONMENTAL SETTING OF WELL DGAJ (1 KM RADIUS)
Sr. No. Particulars Details
1 Well DGAJ Location Village Jijoli Gaon
Mouza Silakuti/ Mahmora
District Sib sagar
State Assam
2
Well site Coordinates Latitude : 2658 14.69 N
Lognitude : 944634.70 E 3 Well Site Elevation above MSL 100 m above MSL 4 Geographical location in
toposheet 83 I/16
5 Nearest representative IMD station
Golaghat (94.1 km, SW)
6 India Meteorological Dept. (IMD), Data-Golaghat
Annual Mean Max Temp 32.7C
Annual Mean Min Temp 15.5 C
Annual Average Rainfall 1898.8 mm
Predominant wind direction North West
Study Period - Site specific
Mean Max Temp 32.4C
Mean Min Temp 5.9C
Average Rainfall 13.6
Predominant wind direction SE
7 Present land use at the site Single crop agricultural land 8 Nearest highway SH-1 (7.3 km, SSW) 9 Nearest railway station Mahutgaon railway station (2.2 km, ESE) 10 Nearest airport Jorhat 11 Nearest rivers Disang river (1.1 km, N) 12 Nearest town Sibsagar (12.5 km, W) 13 Nearest city Sibsagar (12.5 km, W) 14 Nearest major town with
2,00,000 population Sibsagar (12.5 km, W)
15 Villages within 1 km radius Dhitaj Pukhuri (0.5 km, E) 16 Hills/valleys NIL 17 Nearest tourist place NIL 18 Archaeologically important places NIL 19 Protected areas as per Wildlife
Protection Act,1972 (Tiger reserve, Elephant reserve, Biospheres, National parks,
Wildlife sanctuaries, community reserves and conservation reserves)
NIL
20 Reserved / Protected Forests NIL 21 Seismicity Zone-V as per IS 1983 (Part-1) 2002
Note: All distances mentioned above are aerial distances
Source: Topo sheet No: 83 J/9, Google image and field visits
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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TABLE-1.8
ENVIRONMENTAL SETTING OF WELL LKBB (1 KM RADIUS)
Sr. No. Particulars Details
1 Well LKBB Location Village Kotoky Papong
Mouza Khaloighugura
District Sibsagar
State Assam
2 Well site Coordinates Latitude : 270141.296N Lognitude : 9449 53.111E
3 Well Site Elevation above MSL 101 m above MSL 4 Geographical location in toposheet 83 I/16 5 Nearest representative IMD station Golaghat (103 km, SW)
6 India Meteorological Dept. (IMD), Data-Golaghat
Annual Mean Max Temp 32.7C
Annual Mean Min Temp 15.5C
Annual Average Rainfall 1898.8 mm
Predominant wind direction
North West
Study Period Site specific
Mean Max Temp 32.4C
Mean Min Temp 5.9C
Average Rainfall 13.6
Predominant wind direction
SE
7 Present land use at the site Plantation 8 Nearest highway NH-37 (14.2 km, NW) 9 Nearest railway station Lakwa railway station (2.8 km, SSE) 10 Nearest airport Jorhat (73.4 km, SW) 11 Nearest river Disang river (1.2 km, SE) 12 Nearest town Sibsagar (20 km, SW) 13 Nearest major town with 2,00,000
population Sibsagar (20 km, SW)
14 Villages within 1 km radius Bareogoan (0.7 Km, SW) 15 Hills/valleys NIL 16 Nearest tourist place NIL 17 Archaeologically important places NIL 18 Protected areas as per Wildlife
Protection Act,1972 (Tiger reserve, Elephant reserve, Biospheres, National parks, Wildlife sanctuaries, community reserves
and conservation reserves)
NIL
19 Reserved / Protected Forests NIL 20 Seismicity Zone-V as per IS 1983 (Part-1) 2002
Note: All distances mentioned above are aerial distances
Source: Topo sheet No: 83 J/9, Google image and field visits
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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TABLE-1.9
ENVIRONMENTAL SETTING OF WELL CHAQ (1 KM RADIUS)
Sr. No. Particulars Details
1 Well CHAQ Location Village Mothiasiga
Mouza Juktoli
District Sibsagar
State Assam
2
Well site Coordinates Latitude : 265612.73N
Longitude : 9441 11.13E
3 Well Site Elevation above MSL 100 m above MSL 4 Geographical location in
toposheet 83 J/9
5 Nearest representative IMD station
Golaghat (84.8 km, SW)
6 India Meteorological Dept. (IMD), Data-Golaghat
Annual Mean Max Temp 32.7C
Annual Mean Min Temp 15.5 C
Annual Average Rainfall 1898.8 mm
Predominant wind direction North West
Study Period - Site specific
Mean Max Temp 32.4C
Mean Min Temp 5.9C
Average Rainfall 13.6
Predominant wind direction SE
7 Present land use at the site Single crop agricultural land 8 Nearest highway NH-37 (8.2 km, NNW)
SH-1 (4.8 km, SE)
9 Nearest railway station Nazira railway station (4.8 km, SE) 10 Nearest airport Jorhat (55.1 km, SW) 11 Nearest rivers Dikhu river (1.9 km, NE) 12 Nearest town Sibsagar (7.6 km, NNW) 13 Nearest city Sibsagar (7.6 km, NNW) 14 Nearest major town with
2,00,000 population
Sibsagar (7.6 km, NNW)
15 Villages within 1 km radius Mothiasiga Gahairgoan (0.5 km, NE) 16 Hills/valleys NIL 17 Nearest tourist place NIL 18 Archaeologically important places NIL 19 Protected areas as per Wildlife
Protection Act,1972 (Tiger reserve, Elephant reserve,
Biospheres, National parks, Wildlife sanctuaries, community reserves and conservation reserves)
NIL
20 Reserved / Protected Forests NIL 21 Seismicity Zone-V as per IS 1983 (Part-1) 2002
Note: All distances mentioned above are aerial distances
Source: Topo sheet No: 83 J/9, Google image and field visits
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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TABLE-1.10
ENVIRONMENTAL SETTING OF WELL CHAR (1 KM RADIUS)
Sr. No. Particulars Details
1 Well CHAR Location Village Kurulakatia
Mouza Meteka, Bongaon
District Sibsagar
State Assam
2
Well site Coordinates Latitude 2657 51.849N Lognitude - 9440 23.018E
3 Well Site Elevation above MSL 100 m above MSL 4 Geographical location in
toposheet 83 J/9
5 Nearest representative IMD station
Golaghat (85.8 km, SW)
6 India Meteorological Dept. (IMD), Data-Golaghat
Annual Mean Max Temp 32.7C
Annual Mean Min Temp 15.5 C
Annual Average Rainfall 1898.8 mm
Predominant wind direction North West
Study Period - Site specific
Mean Max Temp 32.4C
Mean Min Temp 5.9C
Average Rainfall 13.6
Predominant wind direction SE
7 Present land use at the site Single crop agricultural land 8 Nearest highway NH-37 (4.6 km, NW)
SH-1 (8.3 km, SSE)
9 Nearest railway station Sibsagar railway station (4.2 km, NW) 10 Nearest airport Jorhat (55.6 km, SW) 11 Nearest rivers Dikhu river (0.4 km, E) 12 Nearest town Sibasagar (4.1 km, NW) 13 Nearest city Sibasagar (4.1 km, NW) 14 Nearest major town with
2,00,000 population Sibasagar (4.1 km, NW)
15 Villages within 1 km radius Maj Haloagaon (0.8 km, W) 16 Hills/valleys NIL 17 Nearest tourist place NIL 18 Archaeologically important places NIL 19 Protected areas as per Wildlife
Protection Act, 1972 (Tiger reserve, Elephant reserve,
Biospheres, National parks, Wildlife sanctuaries, community reserves and conservation
reserves)
NIL
20 Reserved / Protected Forests NIL 21 Seismicity Zone-V as per IS 1983 (Part-1) 2002
Note: All distances mentioned above are aerial distances
Source: Topo sheet No: 83 J/9, Google image and field visits
Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam
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1.3.4 Importance of the Project
Total crude oil import for FY 2014-15 was 189.43 MMT almost same as the
imports during FY 2013-14 (189.24 MMT; increase of 0.1%. However, import of
petroleum products (20.28 MMT) increased by 21 percent, mainly on account of
increase in import of LPG (26%), MS (58%), HSD (35%), Bitumen (80%), and
other products like - Aviation gas, Pet Coke (33%), etc.
Petroleum products export declined for the first time in last 15 years; registering
a decline of 6.2 percent mainly on account of decline in export of Naphtha, Fuel
oil, Bitumen, etc.
With total import (crude and petroleum products) combined with total products
export of 63.66 MMT translates to net import volume of 146 MMT for FY 2014-15.
Net import bill for crude oil during FY 2014-15 was 6,873.50 billion (US$ 112.75
billion) against 8,648.75 billion (US$ 142.96 billion) during FY 2013-14 a
decrease of 20.5 per cent in terms of the Indian Rupee and decrease of 21.13 per
cent in dollar value mainly on account of lower crude oil prices in the international
market.
Energy security has become one of the top three goals of the Indian
Government. The Indian Government is encouraging exploration and production
of oil and gas to a great extent. This would primarily allow India to tap its own
resources there by reducing its import bill.
Discovery of viable hydrocarbon reserves in the state can boost the states
economic development to a great extent. It would also catalyse influx of
industries in the stat