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The AAPG/Datapages Combined Publications Database

West Texas Geological Society

Abstract


The Permian Basin: Providing Energy for America, 1999
Pages 55-61

Significance of Intraformational Unconformities in the Morrow Formation of the Permian Basin

Louis J. Mazzullo

Abstract

The tectonic history of the Morrow Formation in the Permian Basin involved numerous syngenetic and post-depositional uplift and exposure events which locally profoundly modified its siliciclastic reservoir section. These multiple events created numerous internal stratigraphic truncations or discontinuities. Consequently, stratigraphic correlations of pay sandstones and reservoir trends in the Morrow are often difficult, even between closely-spaced wells. Intraformational unconformities or re-activation surfaces are easily missed with conventional mapping and may be very important when tracing a sandstone reservoir across a field area or in regional reservoir trend analysis. Presumptions made regarding depositional environments and reservoir trends based on log correlations alone can be misleading, and can result in either missed opportunities or dry holes.


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