electrical resistivity investigation of gas hydrate ... · shear wave seismology, marine seismic...
TRANSCRIPT
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Electrical Resistivity Investigation of Gas Hydrate Distribution in
Mississippi Canyon Block 118, Gulf of Mexico
Prime RecipientJohn A. Dunbar
Baylor UniversityDepartment of Geology
Waco, Texas
DOE Award NumberDE-FC26-06NT42959
NETL Project ManagerFrances Toro
September 18, 2007
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Bottom-Towed Direct Resistivity Profilingfor Hydrate Exploration
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Project Status Phase 1: Evaluate DCR Method for Reconnaissance Surveys
Task 1: Build Ocean-Bottom Resistivity System─ Budget: $88 k of $138 k Federal funds spent/committed─ Schedule: One quarter behind─ Complete and test system Fall 2007
Task 2: DCR Survey of MC 118─ Conduct survey during winter 2008─ Process and interpret data during spring 2008
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Project Organization
Baylor University, Waco, Texas (John Dunbar)Shear wave seismology, marine seismic acquisition, sub-bottom profiling and electrical methods.
Geophysical data acquisition, processing, and interpretation.
Advanced Geosciences, Inc., Austin, Texas (Mats Lagmanson)Commercial DCR systems for engineering, mining, and environmental applications.
Electronic components for DCR system.
Specialty Devices, Inc., Wylie, Texas (Paul Higley)Electrical/ocean engineering, marine acoustics, deep-sea ROVs.
Assembly of ocean-bottom DCR system, field deployment.
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John DunbarProfessional Background
• BS & MS Virginia Tech, 1973-79: Gravity and Heat Flow
• Arco Research, Plano, 1979-84: Shear Wave & Marine Seismology
• PhD UT Austin, 1984-88: Basin Subsidence, LithosphericDynamics, Marine Geophysics
• Shell Research, Bellaire, 1988-94: Basin & Structural Modeling
• Baylor University, Waco, 1994 - : Sub- bottom Acoustic and Resistivity Profiling
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Shallow Marine DCR System
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Example Inverted DCR Sections from Lake Whitney, Texas
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Alternate Paths to the “Holy Grail”of Marine Gas Hydrate Exploration
• Goal– Geophysical method for reliably mapping the concentration of
hydrates within the stability zone
• Seismic methods– Full waveform seismic inversion– AVO– Deep-towed and ocean-bottom reflection systems– Refraction tomography
• Electrical methods– Controlled source EM– Direct current resistivity?
Johnson and Max, The Leading Edge, May 2006
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Mechanical Versus Electrical Response to Hydrate Saturation
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What Electrical Methods Bring to the Table
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Controlled Source EM Verses Direct Current Resistivity
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Near Surface EM and DCR Instruments
Geonics EM31 AGI Super Sting
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Controlled Source EM Vs DC Resistivity
www.WesternGeco.com
CSEM Source & Receiver
DCR Source & Receiver
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Requirements for Commercial Hydrate Exploration System
• Map hydrate concentration
• Penetration to 1 km
• Continuous acquisition at 4 to 5 knots
• 3D coverage for exploration
• 4D coverage for production
• True 3D tomographic imaging
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Phase 1: Ocean-Bottom DCR Reconnaissance Survey
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DCR System Components
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Instrument Pressure Housing DesignBellamare, Inc., La Jolla, California
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Deep-Tow Seismic Grid, Vent Area MC 118
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Massive Gas Hydrate Outcrop at MC 118
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Conceptual Model of MC 118Methane – Hydrate System
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Deep-Tow, ~Pole-Dipole, CRP Geometry
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AGI’s Remote Control Interface Via RS232 Emulation
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Synthetic Model Test: 200 m Thick, Low Saturation Layer
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Synthetic Model Test: Low Saturation Layer Plus High Saturation Sill
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Synthetic Model Test: Low Saturation Layer Plus High Saturation Plug
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Proposed and Preferred DRC Survey Footprints
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Instrument Deployment and Line Change
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Instrument Retrieval and Line Change
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Phase 2: Long-term Fixed Monitoring
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Commercial-Scale Exploration DCR System
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Commercial-Scale 4D, DCR Monitoring System
SpecificationsStatic 3D array100s of channels1000s of electrodesImage on daily basis