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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Detection of Bypassed Pay Using Time-Lapse Log Analysis, San Andres Formation, Central Vacuum Unit, New Mexico
Abstract
Central Vacuum Unit, the site of this study, produces oil and gas from Permian reservoirs in the San Andres and overlying Grayburg Formations. The San Andres reservoir is composed of stacked cyclic shallow-marine carbonates deposited in a ramp setting. Pervasive dolomitization, fracturing, and subsequent plugging of porosity with anhydrite cements have contributed to reservoir complexity. Time-lapse log analyses using resistivity logs, injectivity profiles, and porosity-resistivity overlays have been used to detect bypassed pay and characterize flow units. Commercial rates of production have resulted from frac jobs performed in bypassed pay zones.
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