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Rock Physics Special Interest Group

Sponsored by SIG: Rock Physics

Wednesday 17-Sep-08 5:30 PM to 6:30 PM CDT

CGG Veritas, Visualization Center, 3rd floor

10300 Town Park Dr
Houston TX 77072
Google Maps | Hotels Near | Yahoo! Maps | Weather Forecast

Speaker Ran Bachrach and Per Avseth

Event Description

Rock Physics modeling of Unconsolidated Sands:  Accounting for Non-Uniform Contacts and
Heterogeneous Stress Fields in the Effective Media Approximation with applications to
Hydrocarbon Exploration

We show that by treating the contact stiffness as a variable, one can extend the effective
medium approximation used to obtain elastic stiffness of a random pack of spherical grains. 
More specifically, we suggest calibrating the effective media approximation based on
contact mechanics by incorporating non-uniform contact models. 

The simple extension of the theory provides a better fit to many laboratory and field
 experiments and can provide insight to the micromechanical bonds associated with
unconsolidated sediments. 

This approach is motivated by repeated observations of shear-wave measurements in
unconsolidated sands where observed shear-wave velocities are lower than predicted
by the Hertz-Mindlin contact theory. 

We present in detail the calibration process for well-log data from a North Sea well
penetrating a shallow gas discovery and a deepwater well in the Gulf of Mexico.
Finally, we demonstrate the benefit of using this model
for AVA analysis of shallow sand targets in exploration and reservoir studies

 

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Ronny Hofmann Ezequiel Gonzalez
   

Rock Physics Special Interest Group

Sponsored by SIG: Rock Physics

Wednesday 17-Sep-08 5:30 PM to 6:30 PM CDT

Speaker Ran Bachrach and Per Avseth

Biography

   Ran Bachrach received his BSc. from Tel-Aviv University in Geophysics and
planetary Sciences in 1993 and a Ph.D. in Geophysics
with Ph.D. minor in Civil Engineering from Stanford University in 1998. 
Ran Taught applied geophysics at Michigan State University
until 2002 when he started working with WesternGeco and Schlumberger.
Ran is currently managing the New Technologies
team of WesternGeco's integrated solutions group. 
Ran's research interests are in Rock physics,
Seismic-Geomechanics integration, reservoir characterization
and fracture detection, high resolution seismic and mechanics
of soft sediments.

 

Rock Physics Special Interest Group

Sponsored by SIG: Rock Physics

Wednesday 17-Sep-08 5:30 PM to 6:30 PM CDT

CGG Veritas, Visualization Center, 3rd floor

10300 Town Park Dr
Houston TX 77072
Google Maps | Hotels Near | Yahoo! Maps | Weather Forecast

Rock Physics Special Interest Group

Sponsored by SIG: Rock Physics

Wednesday 17-Sep-08 5:30 PM to 6:30 PM CDT

 
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17-Sep-08 5:30 PM
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17-Sep-08 5:30 PM
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