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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
from:
Chapter 15
Forward Modeling of Log Response in
Geopressured Formations Reveals Valuable
Insights to the Various Pore-Pressure Prediction Techniques
J. C. Rasmus
Schlumberger Product Center,
Sugar Land, Texas
ABSTRACT
A forward model for log response in a geopressured shale is developed. The state of compaction,
lithology, water depths, salinity profiles, compaction coefficients, and clay characteristics are all user
modifiable. Effective-stress relationships for geopressured shales that are currently widely practiced in
the industry all assume constant log response is indicative of constant porosity and, therefore, constant
effective stress. This modeling reveals that, although the porosity of a geopressured shale may remain
constant for a constant effective stress, its log reponse does not. Therefore, this chapter illustrates that
any effective-stress technique that uses the log response directly cannot be used to accurately compute
the effective-stress state of the shale. Instead, the log response must first be characterized in terms of
lithology, salinity profile, fluid moduli, water depth, and compaction coefficients. The modeling shows
that this is much more critical for resistivity than 
velocity
measurements.
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