delta front mass wasting and its potential effects on oil ... · delta front mass wasting and its...
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U.S. Department of the Interior
U.S. Geological Survey
Delta Front Mass Wasting and its
Potential Effects on Oil and Gas
Infrastructure
Jason D. ChaytorU.S. Geological Survey, Woods Hole Coastal and Marine Science Center, Woods Hole, MA
BOEM ITM 2017 - New Orleans, LA
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Acknowledgements
Wayne E. Baldwin, William Danforth, Charles Worley, Eric Moore, Seth
Ackerman, Alex Nichols, Emile BergeronUSGS, Woods Hole
Michael Miner & Melanie DamourBOEM
Samuel J. Bentley & Kehui XuLouisiana State University
Nic Allen and the crew of the R/V Point Sur
Examples of data shown in this presentation are preliminary and subject to change as processing is completed. The
USGS will release these data in accordance with USGS Fundamental Science Practices at a date to be determined.
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Mudflow Hazards of the MRDF
• Hazards to oil and gas infrastructure from hurricane-induced mudflows on the
Mississippi River Delta Front are well known and have been studied, at times
extensively (e.g., Coleman, Prior, Garrison, etc.), over the last few decades.
• Wave-induced Cyclic loading of failure pre-conditioned seafloor during
Hurricanes Camille, Ivan, and Katrina triggered mudflows which damaged or
destroyed platforms, wells, and pipelines.
• Key Questions:
1. Are these mudflows triggered under non-hurricane conditions? Is seafloor
movement episodic only or does part/all of the system constantly
deforming. Which areas are currently moving?
2. What is the long-term history of mudflows? Can this be used to identify
areas of increased hazard potential.
3. What role do environmental factors such as sediment availability and
biogenic gas production and release play in maintaining the mudflow system?
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Mudflow Hazards of the MRDF
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Mudflow Hazards of the MRDF
Coleman, Prior and Garrison, 1980
Hitchcock et al., 2006
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Mudflow Hazards of the MRDF
NOAA High-resolution bathymetry datasets
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Survey Equipment
Vessel: R/V Point Sur
Bathymetry
- Dual-head Reson T20-P (220-300 kHz, 1024 beams, 160-
165 degrees)
- Applanix POS/MV Surfmaster (PPK solutions)
- Head-mounted Applied Microsystems surface SVP
- ODIM/Brooke Ocean MVP 30
- AML MinoxX profiler
Seismic
- Sig 1200 Mini-sparker (300J)
- Applied Acoustics S-Boom (700J)
- Applied Acoustics Single-plate
AA251 Boomer
- Edgetech 512i (Chirp)
- 32-channel solid-state GeoEel
streamer (1.5625 m channel
spacing)
512i
S-Boom/
Mini-sparker32-channel
Streamer
Applanix DGPS
T20P
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5-Day Survey Coverage
Bathymetry
• 600 km of high-resolution
multibeam bathymetry/acoustic
backscatter/water column data in
survey and transit modes
Seismic
• MCS - 240 km of boomer
- 300 km of mini-sparker
• 425 km of 512i Chirp
Sound Velocity
• 74 MVP sound velocity profiles
Landsat 8 (05/28/2017)
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Southwest Pass Survey Site
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SW Pass Survey Site
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SW Pass Mixed Water Mass
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SW Pass Mixed Water Mass
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SW Pass Seismic
Line SW6: S-Boom MCS
Line SW12: Mini-sparker MCS
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SW Pass Seismic
512i Chirp Line 24
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SW Pass Seismic
SE NW
SW NE
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SW Pass Seismic
SE NW
SW NE
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SW Pass Seismic
SW NE
Compressed and
oversaturated Biogenic gas release?
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Deep Water Survey Site
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Deep Water Survey Site
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Deep Water Survey Site
Sparker MCS Line DW4
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Deep Water Survey Site
512i Chirp Line 52
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Deep Water Survey Site
Sparker MCS Line DW26
Sparker MCS Line DW26 - migrated
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Deep Water Survey Site
Sparker MCS Line DW12
NNWSSE
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SS Virginia
SS Virginia
Mudflow Lobe
SS Virginia
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SS Virginia
SS Virginia
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Thank You
Questions?