--> --> Abstract: 4D Seismic Reservoir Monitoring: What is the Role of Geology?, by D. E. Lumley, R. A. Behrens, and M. Levy; #90937 (1998).
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Abstract: 4D Previous HitSeismicNext Hit Reservoir Monitoring: What is the Role of Geology?

LUMLEY, DAVID E., RONALD A. BEHRENS, MARJORIE LEVY; Chevron Petroleum Technology Co.

Summary

4D Previous HitseismicNext Hit reservoir monitoring can be defined as “time-lapse 3D Previous HitseismicNext Hit surveys acquired and analyzed repeatedly at the same site, multiple times during the life of a producing reservoir, to image dynamic changes in reservoir properties related to fluid flow.”

However, 4D Previous HitseismicNext Hit is not simply a trivial extension of 3D Previous HitseismicNext Hit. There are significant differences in cost/benefit analysis, signal-to-noise issues, interpretability, and information content. Furthermore, while interpretation of 3D Previous HitseismicNext Hit data is essentially a static geology characterization issue, the interpretation of 4D Previous HitseismicNext Hit is essentially a dynamic fluid-flow monitoring issue. Therefore, whereas 3D Previous HitseismicNext Hit provides a strong link between geology and geophysics to help build a reservoir model suitable for predicting fluid flow, 4D Previous HitseismicNext Hit shifts the emphasis to geophysics and engineering to directly map, not predict, fluid-flow data in the inter-well space. This can lead to the false impression that the role of geology may be greatly diminished in 4D Previous HitseismicNext Hit monitoring, compared to 3D Previous HitseismicNext Hit characterization. in the extreme, a misleading perspective may be that, since the geology is not time-varying between Previous HitseismicNext Hit surveys, the geology will subtract out altogether in 4D Previous HitseismicNext Hit difference data. This poses a real challenge to geologists to step forward and define the role of geology in 4D Previous HitseismicTop studies. Our presentation will address various aspects of this challenge.

AAPG Search and Discovery Article #90937©1998 AAPG Annual Convention and Exhibition, Salt Lake City, Utah