Two
3-D seismic surveys and a loose grid of 2-D seismic lines of varying
vintage and quality are available at Fullerton field. In addition
to interpreting these data for reservoir geometry and structure,
we have performed some advanced processing on the 3-D survey (Figure
2) in the southern portion of the field. After 90°-phasing and
high-frequency data enhancement, we performed progressive seismic
inversion to create a volume that should be useful for predicting
porosity in areas of limited well control or poor-quality wireline
logs.
In this advanced
processing technique, a wireline-log characterization of acoustic
relationships between reservoir and nonreservoir lithofacies is
used and neural network techniques and model-based seismic inversion
are applied to the seismic volume to (1) remove wavelet effect,
(2) predict impedance and porosity, and (3) incorporate a seismic-based
porosity model into a high-frequency sequence stratigraphic model
and flow model. Emphasis has been on how to optimize the lithological
tie between wireline logs and seismic data and how to seamlessly
integrate high-resolution well interpretation into seismic inversion
to improve model resolution. Preliminary seismic inversion (Figure
17) results from part of the 3-D survey located in the central part
of Fullerton field show how porosity can be predicted at a high
resolution using this technique. |
