--> ABSTRACT: Diagenetic Controls on Primary and Secondary Porosity in Valley-Fill Marine Sandstones--Misener Formation, North-Central Oklahoma, by Dennis Prezbindowski, Richard D. Fritz, and Bill M. Francis; #91022 (1989)

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Diagenetic Controls on Primary and Secondary Porosity in Valley-Fill Marine Sandstones--Misener Formation, North-Central Oklahoma

Dennis Prezbindowski, Richard D. Fritz, Bill M. Francis

The Devonian Misener formation in north-central Oklahoma consists of a series of discontinuous sandstone and shale bodies deposited in erosional topographic lows on the post-Hunton unconformity surface of north-central Oklahoma. Paleontological, mineralogical, and sedimentological evidence supports a marine valley-fill depositional setting including both channel and nonchannel facies. Abrupt changes in sandstone thickness and reservoir properties are characteristic of Misener sandstones. These sandstones were episodically deposited, fine upward and commonly interfinger with an equivalent shale facies. The basal contacts of the Misener sandstone bodies are erosional with the inclusion of shale, phosphate, and sandstone clasts in a medium-grained, dolomitic quartzarenite sandstone. A combination of primary and secondary porosity makes Misener sandstone reservoirs prolific hydrocarbon producers.

Reservoir porosity is best developed in the poorer sorted, medium-grained, dolomitic quartzarenites of the channel facies. A mixed-mineralogy sandstone is critical to the preservation of primary porosity as well as the development of later secondary porosity. Well-sorted, fine-grained quartzarenite sandstones (nonchannel) have been extensively quartz cemented and represent a nonreservoir facies. Early dolomitization in the mixed-mineralogy sandstones prevented quartz cementation from preserving primary porosity. Sandstones containing preserved primary porosity served as preferential pathways for the movement of subsurface fluids. These fluids generated secondary porosity by the selective dissolution of glauconite, phosphate, and lithic grains. Significant posthydrocarbon diagenesis in the form of bitumen precipitation, dedolomitization, and calcite cementation has occurred in the water leg of several Misener sandstone reservoirs.

AAPG Search and Discovery Article #91022©1989 AAPG Annual Convention, April 23-26, 1989, San Antonio, Texas.