3-D AVO AS A PRIMARY TOOL FOR RESERVOIR CHARACTERIZATION IN THE DEEP WATER GULF OF MEXICO
FRANCIS O. ROLLINS, CHARLES M. SKIDMORE, 1996. "3-D AVO AS A PRIMARY TOOL FOR RESERVOIR CHARACTERIZATION IN THE DEEP WATER GULF OF MEXICO", Stratigraphic Analysis Utilizing Advanced Geophysical, Wireline and Borehole Technology for Petroleum Exploration and Production, Jory A. Pacht, Robert E. Sheriff, Bob F. Perkins
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3-D reflection seismic surveys have been reprocessed as 3-D AVO volumes for the purpose of aiding exploration in the deep water Gulf of Mexico. By manipulation of the separate AVO range volumes, reservoir details were revealed which were not present on the conventionally stacked data. The high degree of variability in lithology and thickness in deep water deposits can have an impact on the AVO response in the reservoir intervals. These variations, while present in the unstacked data, are often stacked out or smeared beyond recognition in the post-stack volume. By using 3-D AVO, channel and levee/overbank complexes were identified not previously apparent in the stacked volume. AVO responses are often more sensitive to fluid type in the highly permeable and stratigraphically variable sands of the deep water. Amplitude anomalies from conventional stacked 3-D data may not indicate true fluid properties of the reservoir. 3-D AVO volumes may be utilized to better evaluate the fluid variations. On one prospect, the 3-D AVO displayed better conformity of the seismic amplitude to structure; decreasing AVO suggested the possibility of wet sands in a downdip area which displayed a stacked data amplitude. Interpretation was enhanced with 3-D AVO in zones where multiples were a problem; this was a somewhat unexpected benefit of 3-D AVO. This new information will be essential in determining the placement of additional exploration wells as well as influencing potential production scenarios.