Abstract

Advanced shale distribution analysis was conducted on ten triple combo-logs throughout seven separate deep-water marine reservoirs of varying environments of deposition in Lobster Field of Ewing Bank 873. Conventional and sidewall core photos and data, laser particle sieve analysis, thin section photographs, X-ray diffraction analysis, and scanning electron microscopy were integrated to determine shale type within these reservoirs. By identifying spatial distribution of varying shale type, an enhanced reservoir model may be constructed to aid in reservoir development.

Shale may be distributed in reservoirs in multiple types (laminar, dispersed, and/or structural), which will variably affect reservoir performance. By utilizing high-resolution conventional slabbed core and thin section photographs, intervals which exhibit multiple shale types may be flagged and analyzed. By doing this, a more accurate reservoir model will be constructed that will aid in the evaluation and allow for a better understanding of these mature reservoirs.