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The AAPG/Datapages Combined Publications Database

North Texas Geological Society

Abstract


Basins of the Southwest, Vol. II [Papers presented at the 10th Annual Meeting of the Southwest Section, AAPG], 1968
Pages 53-67

Oils from Yeso Reservoirs and their Basinal Equivalents

B. B. Belt, E. H. McGlasson

Abstract

Yeso rocks of late Leonardian age have contributed a high percentage of the oil produced in the Permian Basin.

The Yeso includes three different facies deposited in shelf, shelf-edge, and basin environments. The shelf facies is composed of bedded anhydritic dolomite and includes the Glorieta and Clear Fork Formations. The shelf-edge deposits, around the margins of the basin, consist of massive, biohermal dolomite; and the deposits in the Midland basin are dark shale, sandstone, siltstone, and dark limestone characterized by the Spraberry Formation.

The basinal sediments appear to be ideal petroleum source rocks and oils produced from basinal Yeso reservoirs are indigenous. Chemical analyses of Yeso oils from each environment show that the oils from the shelves and platform areas are chemically different from basinal oils. These differences are attributed to 1) a basinal source located adjacent to the shelf, 2) mixing with older oils and 3) to chemical reactions with the reservoir rocks. Relationships appear to exist between anhydrite in the reservoir rocks and sulfur, aromatics, and naphthenes in the oils.


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