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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:
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
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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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