Abstract
Core studies were undertaken to determine the facies relationships, continuity, and areal distribution of pay zones in the Denver unit, San Andres reservoir (operated by Shell Western Exploration and Production Inc.). Examination of slabs and thin sections from more than 4,000 ft of core from 19 wells provided the basis for detailed log correlation and zonation of the reservoir over the entire Denver unit. Core examination revealed a classic example of a shoaling-upward sequence where the original sedimentary environments clearly influenced the development and distribution of porosity. The resultant, highly stratified reservoir model evolved because of an interdisciplinary engineering effort to describe the reservoir geometry.
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