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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Preserving Geology in Reservoir Modeling:
A Practical Application of Stochastic Modeling in
Heterogeneous Reservoirs
By
Smedvig Technologies, Inc.
Reservoir characterization is a difficult task, particularly with limited well data. For example, modeling a field with good
vertical
resolution
can present a problem if there are few wells,
even with a 3D seismic survey. This does not necessarily change
the demand for immediate detailed information because of
imposed deadlines for field development, limited time-windows
of rig availability, seasonal constraints, or foreign government
requirements. In the face of imposed deadlines, it is common to
find the geologic model poorly constructed or even bypassed in
lieu of a petrophysical model, the primary input to a reservoir
simulator. Many pitfalls lie in a hasty approach, and resulting
models are often less than satisfactory and the cause of a potentially
costly mistake.
Key to modeling sparse data is the judicious use of geostatistics,
blending both qualitative and quantitative information.
For example, quantitative information from wells can be used to
supply vertical
detail while seismic data and/or conceptual geologic
models can supply information about horizontal continuity,
geologic trends, or sequence stratigraphic constraints. The
result is a detailed 3D computer model that can be used for constructing
reservoir fluid flow studies and a plan for development.
While integrating the geological detail into the model takes time,
it is more efficient and less costly than running a corrected second
model. In this presentation, different methodologies are
demonstrated from actual case histories.
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