Michael Fehler SEG Advanced Modeling Project
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Transcript of Michael Fehler SEG Advanced Modeling Project
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Using Simulation to Address Challenges of
Subsalt Imaging in Tertiary Basins with Emphasis on Deepwater Gulf of Mexico
(Paper 23566)
Michael FehlerSEG Advanced Modeling
Project
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SEG Advanced Modeling Project (SEAM)
Use numerical simulation to Reduce exploration and development risk through improvements to geophysical methods
Relevant and challenging datasets for testing Acquisition design New imaging methods Joint inversion methodologies
Advance state-of-the-art of numerical simulation
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How?• Earth Model representative of GOM DW
• 35km x 40km x 15km
• Cell size 20m x 20m x 10m
• Computer generated datasets
• Outputs look like real field data
• State-of-the-art simulation codes
• Over-sampled for acquisition testing
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Perspective View of SEAM Model
Figure courtesy C. Stork, Landmark Software and Services
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Scope of Work• Subsalt acoustic earth model and simulation
• Extend earth model for shear velocity, anisotropic resistivity
• Non-seismic simulations:-Gravity-Electromagnetic and Magnetotelluric
• Acoustic anisotropic TTI simulation
• Elastic simulation
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SEAM Model Geological Indicator Volume
Basement 1
Mother Salt 2
Cretaceous 3
Oligocene-Paleo 4
Lower Miocene 5
Middle Miocene 6
Upper Miocene 7
Pliocene 8
Pleistocene 9
Water 10
Inv. Lower Mio. 11
Inv. Olig-Paleog. 12
Inv. Cretaceous 13
Salt Suture 14
Salt 15
Hetero Salt 172
10
15
179
1312
11
148
34
5
6
7
1
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Rooting the Seismic Simulation to the Rock Properties Engages Several
Interest Groups
Rock PropertiesVshale, Porosity, Fluids,Sat, Pressure, Resis, …
Elastic ParmsVp, Vs, Dn, Cij, Q(and their reflectivities)
Seismic WavesP, S, qP,S, atten/disp; EM response, Gravity
AVO reflectivity inversionfor elastic parameters
Elasticity inversionfor rock/reservoir properties
Elastic parameter modelingfrom Rock properties
Seismic modeling fromElastic parameters
Interest groups on this end:Imagers, Tomographers, Processors
Interest group on this end:Reservoir characterization and MonitoringJoe Stefani, Chevron
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Model Properties are Derived from Log and Petrophysical Data
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Reservoirs in SEAM Phase I ModelCatalogue
Pleistocene 5 small turbidite fansPliocene 2 E-W trending braided channel
systemsUpper Miocene 2 N-S trending braided channels in
eastern halfMiddle Miocene 2 Large turbidite fans that
enter from NorthLower Miocene 2 Large turbidite fans that enter from
NorthVertically integratedReservoir thickness(white indicates
thicker reservoir)
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Turbidite and Stream Channel Reservoirs Defined Using
Geostatistics
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Several Geophysical Parameters
Defined Using Consistent Approach
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Model Testing to Design Acquisition
Tim Brice, WesternGeco
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Ensure the Quality of Numerical Simulations Through the Use of Benchmark Codes
Comparison of Productionand Benchmark Simulations
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SEAM PHASE I GRAVITY MODEL
Gravity at sea level calculated using GM-SYS 3D
gxx
gyy
gxzgxy
gz
gyz
gzz
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CSEM Simulation Data Shows
Sensitivity to
Reservoirs on East Side of Salt
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TTI Acquisition Plan• ~36,000 shots
• Vertical Seismic Profiles
on 4 wells
• Quality control
• Classic dataset extraction
• Acoustic anisotropic model; tilted axis of symmetry
• ~36,000 shots• ~440,000 surface receivers per shot
• Vertical Seismic Profiles in 4 wells
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Proposed Elastic Acquisition Plan
• ~12,000 shots
• ~460,000 surface receivers per shot
• Seafloor 4-component receivers
• Vertical Seismic Profiles in 4 wells
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Simulation Specifications and
Status
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Simulation Specifications and
Status
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SEAM Model Used for Studies of Wave
Phenomena
Finite Difference Simulation
Boundary Integral Simulation
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ConclusionsSEAM Phase I is providing geophysical data of unprecedented scale
Model is robust and easily extended for uses beyond current modeling effort Honor geology, rock, and reservoir properties
Numerical datasets available for use in studying acquisition, imaging, joint imaging for exploration and reservoir assessment Joint geophysical imaging approaches
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AcknowledgmentsResearch Partnership to Secure Energy for America for support (RPSEA Subcontract No. 07121-2001)
SEAM participating companies (www.seg.org/seam)
Participating company representatives to the SEAM Management Committee
SEAM Board of Directors