Abstract: Vermilion Block 16 Field--Study of Irregular Gas Reservoir Performance Related to Nonuniform Sand Deposition

W. L. Seal, J. A. Gilreath

Sands deposited in a deltaic environment may contain numerous nonconnected reservoirs in what appears to be a blanket sand. If multiple reservoir situations are not recognized and appropriate production plans formulated, significant hydrocarbon reserves will be left in untapped reservoirs.

The Vermilion Block 16 field is a case history of such a situation. The initial bottom-hole-pressure maps provided the first indication of the existence of multiple reservoirs within apparent blanket sands. The next step was a study utilizing dipmeters and other logs designed to divide each sand into as many stratigraphic units as possible.

This information was combined with performance data and reserves were reassessed. As a result of this study, subsequent workovers and new wells have been completed in reservoirs which heretofore may have been considered depleted.

AAPG Search and Discovery Article #90978©1975 GCAGS-GC Section SEPM Annual Meeting, Jackson, Mississippi