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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.

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Presentation on theme: "Secure Energy for America UDW Forum June 22 & 23, 2010 DW-2001: Geophysical Modeling for Studying Acquisition and Processing Methods in the Deepwater Gulf."— Presentation transcript:

1 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

2 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

3 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

4 Salt Model 60 GOM Blocks 15 km deep

5 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

6 Rock Properties Vshale, Porosity, Fluids, Sat, Pressure, … Geophysical Parameters Vp, Vs, Dn, Cij, Q, Resistivity Seismic Waves P, S, qP,S, atten/disp; EM response, Gravity AVO reflectivity inversion for elastic parameters Elasticity inversion for rock/reservoir properties Elastic parameter modeling from 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

7 Vp Model Profile

8 Turbidite Reservoirs Example of turbidite fans in Pleistocene, Middle Miocene and Lower Miocene. Color indicates sand to shale ratio.

9 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 From Joe Stefani; Chevron

10 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

11 AUS Acquisition Plan ~ 11 km long by ~3 km wide 600 m grid – 2793 shots 4 km swath – 6209 shots White = reservoir thickness

12 Free Surface and AUS Comparison ~ 11 km long by ~3 km wide

13 Quality Assurance with Benchmark Code ~ 11 km long by ~3 km wide

14 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

15 T xx T yy T xz T xy T yz T zz GzGz Free-air anomalies at 150 m level background density 2.2 g/cm 3 From Neda Bundalo; Marathon Gravity Simulation 15

16 EM Parameters Rh and Rv ~ 11 km long by ~3 km wide

17 CSEM Acquisition Plan ~ 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

18 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

19 Vs derived from Log and Petrophysical Data

20 Vs Model ~ 11 km long by ~3 km wide

21 Vs to Vp Comparison ~ 11 km long by ~3 km wide

22 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 23 Industry Participants ~ 11 km long by ~3 km wide

24 RPSEA UDW Forum June 22, 2010 Peter Pangman ppangman@seg.org Office: 918-497-5518 DW-2001 Update


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