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Public Briefing
February 6, 2013 Napoleonville, LA
2/6/2013 1
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Shaw Changing to CB&I
• The Shaw Group, Inc. is being acquired by CB&I • Shaw E&I, Inc. is a wholly owned subsidiary
of The Shaw Group, Inc., therefore, Shaw E&I will be a wholly-owned subsidiary of CB&I
• Transaction expected to close mid Feb 2013 • Transaction will not inadvertently impact
the Shaw team or services being provided
CB&I (NYSE: CBI) engineers and constructs some of the world’s largest energy infrastructure projects. With premier process technology, proven EPC expertise, and unrivaled storage tank experience, CB&I executes projects from concept to completion.
2
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ORW Transition to TBC
• Directive 4 of Amendment 4 requires TBC to take over operation and maintenance of the Observation Relief Wells (ORWs) 1 through 4
• ORWs 1, 2 and 4 operations and data collection to be turned over to TBC with Shaw oversight
• ORW-3 transition to TBC pending property access
2/6/2013 3
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Current Progress • Reduce methane in MRAA
– Indoor and sub-slab monitoring – Shallow Geoprobe wells – Venting
• Active 3D seismic potentially images hydrocarbons vs water – Stability of the disturbed rock (collapse) zone and void spaces – Passive Seismic data showing fluid flow and “burps” – Active 3D Seismic 2007 and 2013 survey – Geomechanical modeling
• Stability of western side of NSD and adjacent caverns – Passive Seismic data showing microseismic earthquakes – Vertical Seismic Profiling (VSP) – Geomechanical modeling
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Shaw Team Additions
• Don Marlin – Petroleum Geophysicist – Independent evaluation of 3-D seismic – Quantifying/mapping/characterizing oil and gas
reservoirs contributing to sinkhole
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Donald J. Marlin, CPG • Certified Professional Geologist, Certified Petroleum Geophysicist, Board
Certified Geoscientist. Consulting to the State of Louisiana to make an independent review of the 3D seismic data.
• Bachelor’s and Master’s degrees in Geology from LSU Baton Rouge. • 30 years experience in Gulf Coast. Authored papers on SE Louisiana
subsurface /surface geology, 3D Seismic applications for environmental & groundwater reconnaissance, and 3D Seismic project management.
• Consulted for numerous exploration companies, state and university agencies, landowners, and individuals.
• Involved in the design, acquisition, processing, interpretation, and development drilling for numerous 2D & 3D seismic programs.
• Worked resulted in successful drilling of wells in the US and abroad.
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Marlin’s major 3D activity 1992 – present versus Bayou Corne
Bayou Corne ~0.42 sqmi
Bayou Corne ~0.42 sqmi
Note: Marlin’s 2D / Subsurface activity in 1980’s not shown
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January 2013 : Study historical well data and tie to 2007 3D seismic subset to create a pre-sinkhole subsurface model:
8
N
1970-1982
1930-1960
1984-1986
2000-2002
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9
1 of 3 PRE-SINKHOLE STRUCTURAL
CROSS-SECTIONS
Salt Wall
2/6/2013
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Salt Wall
Detail Of
Section
REPUBLIC #1 HECI #1 OXY #3 Cavern
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Salt Wall
Detail Of Section
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Major Shale barriers
Major Faults Sinkhole
Salt Wall
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Salt Wall
Depleted Reservoir
Sinkhole
Other PHS Other PHS Other PHS Other PHS Other PHS Other PHS Other PHS Other Possible Hydrocarbon Source (PHS)
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Path Forward
• Obtain new April 2013 data for independent study. • Integrate and revise January 2013 study data. • Assess differences in the volumes to look for changes. • Identify O&G reservoirs that could source the sinkhole. • Quantify O&G reservoirs. • Estimate time to depletion of reservoirs. • ASSIST WITH ROADMAP TO RECOVERY FOR AREA
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ROCK MECHANICS MODELING AND PASSIVE SEISMIC MONITORING
Dr. Will Pettitt
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Current Situation • What do we know?
– Sinkhole size and shape.
– Amount of debris filling the cavern.
– Size and shape of the cavern.
– Gas behavior in the near surface.
– Some information on site geometry and rock properties.
• What do we NOT know? – Size and shape of the
Disturbed Rock Zone (DRZ).
– Behavior of the DRZ at depth.
– Good geometry of the salt dome wall.
– Effect of DRZ on western edge of the salt dome.
– Rock properties through the sedimentary layers.
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Statistical Analysis for Final Sinkhole Size
Sophisticated computer modeling is examining all this in greater detail….
Sinkhole Diameter Most Likely = 734 ft
Worst Case = 1398 ft
Sinkhole Depth Most Likely = 144 ft Worst Case = 346 ft
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Disturbed Rock Column
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1000 ft well – Shallow geophone string – under design
and installation Surface seismic stations – 6x USGS stations replaced with
6x TBC stations
450 ft well – Shallow geophone string -
installed
Oxy 1 Microseismic Array – under design and installation
Passive Seismic – Map
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New Seismic Stations
Photograph courtesy of Dario Baturan, Nanometrics Inc.
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Seismic Activity at Bayou Corne • Active vs Passive – active seismic uses a “man-made”
source (e.g. 3D seismic survey, VSP) whereas passive seismic listens to “natural” sounds from the sub surface.
• MEQs – Micro-earthquakes are associated with small scale rock movements, usually on fractures and joints.
• VLPs – Very Long Period events are associated with gas and/or fluid movements through voids and fissures.
• January 19th sink hole event provides an example. Current helicorders at http://folkworm.ceri.memphis.edu/heli_temp/
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Micro-earthquake Event Rates
Background Activity 0 to 10 events per day
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VLP Event Rates
0
10
20
30
40
50
60
70
80
90
8/6/2012 9/6/2012 10/6/2012 11/6/2012 12/6/2012 1/6/2013
Freq
uenc
y, #
/day
Date
VLP Detections Per Day Note: Limited data for Jan
16-17 due to weather issues affecting the
stations. Preliminary results from Weston Geophysical and Julie Shemeta (MEQ Geo Inc.)
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Buried Surface Array
450 ft Shallow Array
Oxy 1 Microseismic Array
Temporary and Permanent Deployment
Positioned in salt between approx. 800 – 2400 ft depth
(To Be Determined)
1000 ft Shallow Array (To Be Determined)
Oxy 1
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Oxy 1 Microseismic Objectives • Objectives of microseismic (MS) monitoring
(passive seismic) in well Oxy 1: – More accurately determine the positions of the
observed micro-earthquakes and their relation to the rock disturbed zone;
– Observe if micro-earthquakes are occurring at depths greater than 2500 ft depth, and, if so, image their relation to the Oxy 3 cavern.
21-Jan-2013
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Temporary Microseismic Array
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Oxy3 Oxy2
Oxy9
Oxy1
Napoleonville Salt Dome
Looking Northeast
Sedimentary Rock Outside the Salt Dome
Ground Surface
Temporary microseismic array (approx. position)
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Example Location of Microseismicity
Example from an oil field monitoring job in east Texas
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Example Microseismic Imaging
Example from an oil field monitoring job in east Texas
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Helicorder Showing Truck Traffic
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Technical Update
• Amendment 5 revised directives • Gas venting • Oxy 3 cavern data and cavern stability
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Revised Amendment 5 Directives
• Original directives called for two 6000 foot wells
• Revised directive – 3D seismic survey by end of April to image
collapse zone and ID gas horizons – Installation of seismic array in Oxy 1 cavern well to
listen in salt – Drilling and sampling 1000 foot core well west of
sinkhole for rock mechanics testing for model inputs
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Why Revisions?
• Get data we need sooner • Get 3D seismic data for comprehensive
evaluation of collapse zone • Get answers faster to ongoing gas and stability
questions and issues • Evaluate data obtained and make
recommendations as needed
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Gas in Aquifer and Venting
• Venting since mid-November with ~6.4 million cubic feet flared
• Obvious pressure and gas column reductions in vicinity of ORW-01/02 area
• Know how to install and operate wells to remove gas from Mississippi River Alluvial Aquifer (MRAA)
• Tetra-Tech implementing a large-area system • Determined some limitations of PDK logs in
defining gas in MRAA
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Areas of Gas and Disturbed Rock
• Still seeing pressures in Geoprobe wells even where MRAA gas pressures have declined
• Observed about 20 new bubble sites–mostly on west side of sinkhole around perimeter of modeled disturbed rock column
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Vent Well Flow Rate
0
10
20
30
40
50
60
70
80
Nov-12 Dec-12 Jan-13 Feb-13 Mar-13
Flow
Rat
e (c
fd)
ORW-01 ORW-02 ORW-04 TBC RW #1
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Vent Well Pressures
0
10
20
30
40
50
60
Nov-12 Dec-12 Jan-13 Feb-13 Mar-13
Flow
ing
Wel
lhea
d Pr
essu
re (p
si)
ORW-01 ORW-02 ORW-04
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Venting Operations
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Master valve
Choke Flow
reco
rder
Orifice plate Flare stack
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Proposed MRAA Vent Wells Areas of Gas Mitigation
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PDK Logs-Industrial Water Wells • PDK logging technology may or may not be capable of
identifying gas with a high degree of confidence in all wells surveyed (False negative—gas there but don’t see it)
• Dependent on several factors: – Construction of the well – casing size, diameter, presence of
cement, multiple strings – Insufficient gas saturations in the formation due to timing of
logging and/or lithology (permeability) – Geometry of logging tool within the well casing (against casing
so not reading fluid in casing instead of formation) • PDK logs evaluated as having no gas in the wellbores with
multiple strings of casing should not be interpreted as absolute as seen in the observations of the Oxy WW#2 and WW#3 as compared to TBC core hole and TBC-RW-1
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Oxy WW#2 and WW#3
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Oxy WW#2 and WW#3
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PDK Logs and Vent Well Performance
• Recent logs in ORW-01, ORW-02, and ORW-04 showed no obvious gas column in wells
• All 3 wells are still venting gas at 2 to 7 mcfd with between 10 and 25 psi FWHP (flowing wellhead pressure)
• Conclusion: Below a certain gas saturation in pore space in aquifer, the PDK log cannot detect presence of gas
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Path Forward on Vent Wells
• Need to install several vent wells in community • Making good progress on how to do it • TBC installing many new vent wells • Operate with standard chokes and flow meters • Collecting data needed to evaluate performance • Gas can be present even if not observed in PDK
logs • Dr. Charles Faust (Tetra-Tech) developing
comprehensive overall gas mitigation model
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Sinkhole December and January
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Sinkhole Cross-Sections
South to North West to East
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Cavern Stability
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Caverns Included in Stability Assessment
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Cross-sections Through Caverns
West-East
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South-North
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Conceptual Model Update • Sinkhole “burps”
• Strong indication of voids that fill with gas and then release
• 1/19/13 burp event indicated that large gas bubble unlikely to reach surface as one bubble
• Sinkhole changes and Oxy 3 pressures reflect disturbed rock zone changes
• Seismic tremors—two types • Rock movement • Gas moving thru voids
• Vertical seismic profiles (VSP) completed in Oxy 1, 2, and 3A
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View looking North From 3D Geologic Model
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Dec. 2012 Cavern Pressure Declining
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Oxy 3A Pressure 2013
200
300
400
500
600
700
800
900
1000
1100
1200
1/12
1/19
1/26
2/2
2/9Pr
essu
re (p
si)
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1/19 Burp Event
Increase to 1150 psi
400 psi increase Hydrocarbon removal
Non-operational pressure fluctuations appear to be related to VLP seismic events
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Oxy 2 Pressures During 1/19/13 Seismic Event
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Cavern In-Filling Rate
• Vertical depths plotted (not measured depths)
• Major fill event of 100’ from 1/17/2013 to 1/31/2013—related to seismic activity
• Roof of cavern at 3400’ vertical depth
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4092 4085
4043 4033
4026 4022 4013
4002 3997
3987
3944
3844 3830
3880
3930
3980
4030
4080
9/29 10/29 11/29 12/29 1/29
VERT
ICAL
DEP
TH (F
EET
BELO
W G
ROU
ND
SURF
ACE)
DATE
OXY 3 CAVERN FILL DEPTH & FILL RATE
248 ft over 124 d 2.0 ft/d
(1,450,000 bbls or 302,000 cy)
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Oxy 3 Cavern Summary
• Oxy 3 cavern is again in communication with disturbed rock column
• Not making much gas but still making liquid hydrocarbon
• Oxy 3 pad damaged in 1/13 to 1/19 seismic events—Respec doing stability evaluation
• Approximately 400 feet to fill in before cavern full • Lack of observed seal pressure response in Oxy 2
during 1/19 seismic events positive indication of adjacent cavern stability at present
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Path Forward • Reduce methane in MRAA
– Ventilation, indoor and sub-slab monitoring – Shallow Geoprobe wells to monitor shallow pressure – Know how to reduce gas volumes and pressures in MRAA and large-area system being
installed
• Stability of the disturbed rock zone and void spaces – Passive seismic data show micro-earthquakes and fluid flow – Sinkhole changing with each survey – Active 3D seismic survey and VSP’s of three caverns – Geomechanical modeling
• Evaluating stability of western side of dome – Analysis of ongoing seismic events with upgraded passive seismic array systems
including salt seismic monitoring – Active 3D Seismic imaging of disturbed rock zone – Rock mechanics modeling with site data from core hole
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Questions?
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