block 43b - onshore oman - oman bid round · 3 block ownership history over its history block 43b...
TRANSCRIPT
1
Block 43B - Onshore Oman
SUMMARY
Block 43B is an 11,967 km2 area located along the coastal area of Oman north of the Hajar
Mountains. This is an unexplored region, both geographically and stratigraphically. Block 43B
has time-equivalent formations with the interior of Oman but these have not been explored
in any depth.
The known formations located in the block are well-displayed in outcrop. Those that are the
most likely reservoirs are thick and comparable in rock properties to oil-bearing formations
in the interior of Oman. In the subsurface within the block these potential reservoir rocks
have had gas shows.
Conventional gas is the main play type across the block. Oil is also possible since this block’s
burial was not as deep as those to its south. While there have been no discoveries (only two
wells have been drilled here) there are several prospects mapped across the block.
2
3
BLOCK OWNERSHIP HISTORY
Over its history Block 43B has had several owners, the primary ones being Petroleum
Development (Oman) and Amoco. Other companies which have owned this block are:
Hawasina, LLC
MOL
Only two wells have been drilled. The first was drilled in 1985 by Amoco: the Barka-1. The last
well, the Hawasina-1, was drilled by MOL. The last owner of the block was MOL.
AVAILABLE DATA
1,200 km of 2D seismic data
Block seismic base map, satellite image map and infrastructure map
Gravity data
Data for two wells
Seismic and well location base map
STRATIGRAPHY
4
Oman chronostratigraphic chart (GTS 2012 dates incorporated)
5
The stratigraphic section that occurs within this block is predominated by Tertiary age
carbonates and clastics. The Eocene and Paleocene formations are the most significant
potential reservoirs. The Miocene through Pleistocene section has a complex stratigraphic
architecture. This section is potential reservoir. The Campanian age Al Khwad Formation is a
possible reservoir.
From a chronostratigraphic point of view the section within Block 43B is equivalent to the
post-Fars, Fars, Hadhramaut and Aruma groups.
Stratigraphic column for Block 43B
6
Stratigraphic relationships for Block 43B. The base of the Al Khwad Formation is an unconformity.
In some areas this formation may sit directly upon ophiolites, as shown here.
Based on outcrop and seismic analyses the entire stratigraphic section from Campanian
through Holocene is characterized by numerous unconformities. These are directly related to
two controlling factors:
Post-Cretaceous structuring due to tectonic plate interactions.
Sea level variations due to Tertiary age glacial episodes.
In addition to the unconformities the block covers the northern platform edges for several
thick intervals. Vertical build-ups and progradational clinoforms occur along these edges.
Platform-edge mounding and clinoforms within the Seeb Formation.
OUTCROP AND ANALOGS
The Maastrichtian through Holocene sedimentary section is accessible and well-exposed in
the mountains around Muscat. These provide a clear representation of the overall lithologies
7
and stratigraphic successions expected to occur within the block. The specific formations that
outcrop around Muscat are:
Undifferentiated Holocene, Pleistocene and Pliocene sediments
Seeb Formation
Rusayl Formation
Jafnayn Formation
Al Khwad
The outcrop belts extend to Wadi Tiwi, westward along the coast from Muscat.
DISCOVERIES
There have been no discoveries within the block. Gas shows were encountered throughout
the carbonate units in the Barka-1.
PROSPECTS
Several prospects have been mapped within the Seeb Formation. These occur along the
coastal portion of the block.
PLAY SUMMARY
Conventional gas is the main play type across the block. Oil is also possible since this block’s
burial was not as deep as those to its south.
TRAP
Predominantly 2-way dip-closed, fault-bounded anticlines. Stratigraphic traps associated with
reefs have been identified in adjacent blocks and are expected to occur within this block.
Platform-edge mounding and progradation are visible on seismic within the block (see
previous figure). Elsewhere in Oman, such as in the Natih and Shuaiba formations, such
geometries result in successful stratigraphic traps.
8
SW to NE seismic line (4BAR-06/08) illustrating structure. Evidence of thrusting visible as are antithetics which create fault-bounded closures.
RESERVOIR
Reservoirs include stable, shelf limestones in the Seeb and Jafnayn formations, sandstones
and conglomerates in Pliocene through Holocene deposits and limestone-dominated clastics
in the Pliocene and Pleistocene deposits. Clastics in the Al Khwad Formation may also be of
reservoir quality. The Seeb and Jafnayn formations have good reservoir quality with high
porosity as well as permeability.
SEAL
Locally seals within the limestone units are probably thin but continuous shales/marls. On a
more regional scale shaly units within the Rusayl Formation, marls within the Jafnayn and
Seeb formations and Batinah Group marls and shales could serve as effective seals. The
potential sealing intervals are visible in outcrop and contribute to the overall flat-iron patterns
in the mountains near Muscat.
SOURCE
9
The Early Eocene rocks are considered a primary source. Paleocene and Maastrichtian rocks
may also contain source rocks. Numerous possible migration pathways exist along bedding
and faults.
MOVING FORWARD
Proceeding further takes you out of the public area. Doing so gives you access to the raw data
as well as the ability to order interpretation-ready and evaluation packages. There are 4 steps
for moving forward.
Step 1: MEERA Subscription for the bid round
MEERA is the software platform being used by the MOG. It allows users to view data
live and interactively from anywhere in the world. For more information on this
platform please view the LDR video.
The subscription permits general access and allows viewing of the data packages.
The system is the official point of contact with the MOG and will be used for
Interaction with the MOG, including clarification requests.
Bid submissions
Award notifications
Step 2: MOG raw data viewing and purchase
These data can be viewed live from anywhere in the world via the MEERA platform.
Acquiring the raw data is simple. These data can be downloaded directly or can be
provided on digital media for a selected destination.
There is a large amount of raw data for this block. These data include seismic lines,
well documents and gravity data. Following is a brief summary listing for seismic and
well data.
Seismic data: Results from 11 2D surveys in segy.
BHP90BA: 19 lines
MOL06REG1: 26 lines
MOL06REG3: 3 lines
MOL07REG1: 175 lines
MOL08REG1: 219 lines
MOL10YNQ1: 39 lines
MOL11YNQ1: 6 lines
REP11MA_1: 5 lines
REP11MA_2: 4 lines
SDO96BA_1: 39 lines
10
UNK50BA_2: 16 lines
Those surveys possessing a high number of lines may contain a smaller number of total
lines which have been processed in several ways.
Well Data: Not all wells contain the same types of data. Most have log data and many
have a series of well documents. Some wells also have core data.
Barka-1
Hawasina-1
Step 3: Target Oilfield Services’ interpretation-ready package viewing and purchase
Target Oilfield Services has prepared an interpretation-ready Petrel project. The Petrel
project contains all seismic data and MOG raw well data.
Step 4: Target Oilfield Services’ evaluation package viewing and purchase
Target Oilfield Services has completed a comprehensive block interpretation. This
interpretation has rectified data errors and inconsistencies. It places the block within
a regional context and incorporates Target's extensive knowledge of Oman's geology
and reservoirs. Intended to aid in block analysis the evaluation package provides a
significant advantage to anyone trying to assess this block.
The evaluation package for Block 43B contains the following.
A geological evaluation report for the block.
o Reviews and updates/corrects stratigraphy across the block.
o Contains a sedimentological study for the entire Fars through Huqf
interval.
o Reviews and provides details on the geologic structures within the
block.
o identifies existing and additional prospects within the block.
Well log data
o Edited, spliced and QC log files for wells
o Interpreted logs for wells
Fault interpretations of the 2D seismic data for the following horizons.
o Miocene Unconformity
o Top Oligocene
o Top Seeb Formation
o Top Jafnayn Formation
Multi-horizon TWT and depth interpretations of the 2D seismic data.
o Miocene Unconformity
o Top Oligocene
o Top Seeb Formation
o Top Jafnayn Formation
11
Data are in digital format and can be provided as:
o Downloadable data in standard digital formats.
o A complete Petrel project containing the wells, well logs, seismic data
and interpretations.
o A complete Kingdom project containing the wells, well logs, seismic
data and interpretations.
MINISTRY INFORMATION
When available the standard MOG data to be provided include:
All 2D and 3D seismic data within the block boundaries
Gravity data associated with the block
Well files for all wells in the block (note: these may not exist for all wells)
Cultural data: Infrastructure, etc.
Surface topography maps
Contact:
Suleiman Saif Al Ghuniami
Director of Petroleum Concessions
Ministry of Oil and Gas
Tel +968 24640526
Fax +968 24602541
E-mail: [email protected]
TARGET OILFIELD SERVICES INFORMATION
Contact: