A CASE STUDY OF AMPLITUDES IN DRAINED PAY: THE EI-330 LF SAND
PETER B. FLEMINGS, ANDREW R. HOOVER, TUCKER BURKHART, STEVEN E. NELSON, 1996. "A CASE STUDY OF AMPLITUDES IN DRAINED PAY: THE EI-330 LF SAND", 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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The LF sand is the largest single producer in the Eugene Island Block 330 Field. Strong seismic amplitudes are associated with downdip portions of this sand, although the sand is interpreted to have been drained before the Shell 1992 seismic survey was shot. An integrated analysis suggests that these amplitude anomalies are due to static rock properties, and are not indicative of bypassed pay. Downdip, the sand has a 25’ thick high velocity cap which has low oil saturations. Whole core of this zone is very fine grained, poorly sorted, clay rich, and contains two (~1 ft.) calcite-cemented intervals. In this downdip zone, the LF sand top correlates to a strong peak in the seismic wave form. Synthetic seismograms also predict a peak in the seismic wave form at the sand top. Updip, the LF sand does not have a high velocity cap but does have low hydrocarbon saturations. In this zone, the sand top is correlative with a trough in the seismic wave form as is predicted from synthetic seismograms. These results emphasize the importance of integrating wireline, core, and seismic analyses in the search for bypassed hydrocarbons and reveal the complexities inherent in predicting the acoustic response of reservoir production.