--> Abstract: The Upper Morrowan Petroleum System in the Anadarko Basin and Hugoton Embayment, Jim Puckette, Adam DeVries, Aaron Rice, #90097 (2009)

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The Upper Morrowan Petroleum System in the Anadarko Basin and Hugoton Embayment

Jim Puckette1,   Adam DeVries2,   Aaron Rice3

1Oklahoma State University,   2Chesapeake Energy Corporation,  3Samson Resources

The upper part of the Morrowan Series in the Anadarko Basin and Hugoton Embayment represents a petroleum system with two distinct sediment-dispersal systems: (1) a southward-flowing fluvial-dominated one and (2) a northward-prograding fan-delta complex adjacent to the Wichita-Amarillo Uplift. Both systems produce large volumes of petroleum. The southern or Wichita system consists of northward-prograding fan-delta and fine-grained deltaic complexes that were sourced primarily from the sedimentary and igneous rocks exposed during the Wichita orogeny. The northern system consists of a series of southward-flowing fluvial-dominated tracts whose drainage basin encompassed an area including the Transcontinental Arch, Central Kansas Uplift and the Front Range/Apishapa/Sierra Grande Uplifts. The rising Wichita-Amarillo Uplift shed large volumes of coarse-grained clastic debris. Mississippian carbonates sourced chert gravels. Erosion into the core of the uplift supplied igneous rock fragments and quartz. Distal finer-grained gravels and channel-filling sands were separated by and often encased in organic-rich marine mud deposited by cyclic periods of coastal flooding. Sediments of the northern shelf system were derived primarily from softer sedimentary rocks that cropped out within the drainage basin. Basement rocks exposed on the uplifts were sources of quartz and igneous rock fragments, but these areas were relatively small. Sediments of the northern system were mud dominated and sand transported down valleys during lowstands was dispersed in the Morrowan sea. Subsequent transgression trapped sand in these valleys as they flooded. Continued sea-level rise ultimately covered valleys with organic-rich mud that became source beds for petroleum accumulations.

 

 

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