secure energy for america udw forum june 22 & 23, 2010 dw-2001: geophysical modeling for...
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Secure Energy for America
UDW Forum June 22 & 23, 2010
DW-2001: Geophysical Modeling for Studying Acquisition and Processing Methods in the Deepwater Gulf of Mexico
• Reduce GOM exploration and development risk
• Relevant and challenging simulated datasets
improve survey acquisition design
imaging and processing research
joint inversion studies
• Advance state-of-the art in numerical simulation
• Industry forum for subsalt geophysical issues
Goals
• Build on success of SEAM Phase I “Subsalt”
• Extend earth model for Vs and resistivity
• Acoustic Absorbing Upper Surface (AUS) simulation
• Non-seismic simulations:
Gravity
Electromagnetic and Magnetotelluric
• Elastic simulation
• Anisotropic TTI simulation
Scope of Work
Salt Model
60 GOM Blocks15 km deep
Model Overview
Structural Features– complex salt body with rugose top, root, overhangs– 9 horizons that extend across the entire model– 12 radial faults arrayed under salt near to salt root– 1 overturned sediment raft proximate to salt root– 2 internal sutures in salt and a heterogeneous salt cap
Stratigraphic Features– 13 turbidite fan and braided channel reservoirs – fine layering - 10m x 10m x 10m grid cells – geophysical parameters derived from rock properties
Rock PropertiesVshale, Porosity, Fluids,Sat, Pressure, …
Geophysical ParametersVp, Vs, Dn, Cij, Q, Resistivity
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
Geophysical modeling from parameters
Interest groups on this end:Imagers, Tomographers, Processors
Interest group on this end:Reservoir characterization and Monitoring
Modified from Joe Stefani; Chevron
Simulation rooted in Rock Properties
Vp Model Profile
Turbidite Reservoirs
Example of turbidite fans in Pleistocene, Middle Miocene and Lower Miocene. Color indicates sand to shale ratio.
Braided Channel Reservoirs
Example of braided channels in Pliocene and Upper Miocene. Statistical features of the channels (length, width, thickness, sinuosity, Vshale) from real world measurements
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
From Joe Stefani; Chevron
• No free-surface multiples
• 9,000 acoustic shots: grid and 4km wide swath
• Up to 450,000 traces per shot
• Simulation complete – awaiting QC
• Applications:
• Direct evaluation of imaging algorithms
• Evaluation of de-multiple algorithms*
Absorbing Upper Surface Simulation
* when combined with Phase I acoustic free surface dataset
AUS Acquisition Plan
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
600 m grid – 2793 shots
4 km swath – 6209 shots
White = reservoir thickness
Free Surface and AUS Comparison
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
Quality Assurance with Benchmark Code
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
• Gravity (full tensor) complete
• Earth model extended for resistivity parameters
• Rv and Rh relative to bedding
• CSEM 3D simulation
• Lawrence Berkeley National Lab for benchmark
• acquisition parameters established
• vendor bid request in preparation
• Magnetotelluric simulation
Non-Seismic Simulations
Txx
Tyy
TxzTxy
Tyz
Tzz
Gz
Free-air anomalies at 150 m levelbackground density 2.2 g/cm3
From Neda Bundalo; Marathon
Gravity Simulation
15
EM Parameters Rh and Rv
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
CSEM Acquisition Plan
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
From Michael Frenkel; EMGS
• 3D acquisition
• 5 azimuth source lines on each receiver side
• 10 km line offset
• Vs parameterization near complete
• Compute intensive
• Acquisition trade-offs under evaluation
• Sandia National Lab contracted for benchmarks
• Vendor capability under development
• SEAM project providing incentive
Elastic Simulation
Vs derived from Log and Petrophysical Data
Vs Model
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
Vs to Vp Comparison
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
• TTI – Tilted Transverse Isotropy
• Immediate industry need
• Contract extension nearly finalized
• TTI parameterization of SEAM earth model
• Up to 10,000 TTI acoustic shots
• Delivery, August 2011
TTI Anisotropic Simulation
NEW!
23 Industry Participants
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
~ 11 km long by ~3 km wide
RPSEA UDW Forum June 22, 2010
Peter [email protected]
Office: 918-497-5518
DW-2001 Update