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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Use of
Well
Logs in Seismic Reservoir Characterization
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By
Rock Solid Images,
Houston, Texas
Seismic reservoir characterization, also known as reservoir
geophysics, has evolved over the past several years into a
multi-disciplinary, business-critical function in most ED&P
organizations. Sheriff defines reservoir
geophysics as “The use of geophysical
methods to assist in delineating or
describing a reservoir or monitoring
the changes in a reservoir as it is produced.”
Reservoir geophysics is applied
across a wide spectrum of the oilfield
life cycle from discovery and early
development to tertiary recovery. One
critical part of this process is careful
analysis
and understanding of petrophysical
properties from
well
logs and
core data (seismic petrophysics).
This presentation will illustrate why seismic petrophysics is so important and will show how carefully constructed synthetic models can help the geoscientist interpret acoustic and elastic impedance inversion from seismic data.
Seismic petrophysics can be performed on single or multiple wells and consists of the following basic steps.
Geophysical Well
Log
Analysis
(GWLA)
- Collect and organize input data, reservoir conditions, and fluid properties
- Perform geophysical
log
interpretation for volume minerals, porosity, and fluids over entire
well
- Edit logs and perform mud filtrate invasion correction (as needed)
- Generate missing curves (for example shear wave velocity).
Rock Physics Modeling and Perturbations
Perturb reservoir properties using rock physics effective medium models and compute new Vp, Vs and density curves.
- Fluid Saturation
- Porosity
- Lithology
- Net/gross
Synthetics
Compute synthetic seismic traces for in-situ and modeled conditions. May also include:
- AVO response
- Acoustic impedance (AI) and elastic impedance (EI)
- Other seismic attributes as needed
Examples show the effects of mud filtrate invasion effects, wellbore
washouts and a bad Vshear log
on seismic
well
tie. An
example is also shown of how seismic
End_Page 27---------------
petrophysics can be used to interpret acoustic and elastic impedance
inversions for oil saturation and porosity in an on-shore
United States oil sand. The pricipal benefits of seismic petrophysics
are improved well
-to-seismic ties, improved calibration
of seismic attributes to reservoir properties, and more reliable
models of seismic response due to reservoir changes (vertically,
laterally and temporally). These models can improve interpretation
of 3D seismic data, especially acoustic and elastic impedance
inversion. This improved interpretation can reduce drilling risk,
enhance field productivity and ultimately increase asset value.
Note: This presentation is based on OTC paper 16921, May 2004.
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