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3-D Progressive Seismic Inverstion for Porosity Modeling
November 2004 Presentation in PDF Format
Fullerton Clear Fork Field

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Figure 2

3-D Seismic and Inversion Porosity Model

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Figure 17

Integrated Geological and Engineering Characterization of
Fullerton Clear Fork Field in Andrews County, Texas
Seismic Attribute Analysis and Inversion

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.


Reservoir Petrophysics

Sequence Stratigraphy and Facies

Rock Fabrics and Petrophysical Classification

3-D Reservoir Modeling and Simulation

Structural Controls on Reservoir Development

For more information, please contact Steve Ruppel, principal investigator. Telephone 512-471-2965; e-mail stephen.ruppel@beg.utexas.edu.

January 2004