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The AAPG/Datapages Combined Publications Database

Abilene Geological Society

Abstract


Strawn and Canyon Sands: Depositional Systems, Exploration Models and Completion Techniques, 1983, pages 1-86.

Strawn and Canyon Depositonal Systems, Sedimentation History and Exploration Models for the Concho Platform-Eastern Shelf of North-Central Texas

Part I of Lecture Notes - Outline of Topics Presented

by

Arthur W. Cleaves
Oklahoma State University

 

Late Desmoinesian (Strawn) and Missourian (Canyon) Depostional Systems of the Eastern Shelf, North-Central Texas

Part II of Lecture Notes

by

Arthur W. Cleaves

Oklahoma State University
Stillwater, OK

and

Albert W. Erxleban

Tenneco Oil Exploration and Production
Houston, TX

ABSTRACT

Terrigenous clastic and carbonate facies making up the upper half of the Strawn Group and the entire Canyon Group (Pennsylvanian System) were deposited within the Fort Worth Basin and on the adjacent Concho Platform (Eastern Shelf) of North-Central Texas. Twelve cycles involving deltaic progradation and marine transgression serve to subdivide the outcrop and subsurface stratigraphic sections into mappable genetic units. For the upper Strawn, net sandstone isolith maps indicate the presence of four deltaic depocenters, two carbonate banks, one carbonate platform, and an embayment-strandplain complex. Higher, in the Canyon Group, there is one principal deltaic depocenter, a fan-delta system, a shelf edge-slope complex, as well as the bank and platform carbonate build-ups. Variations in the rate of subsidence for the Fort Worth Basin, Knox-Baylor Trough, Concho Platform, and the Red River Uplift, combined with the beginning of subsidence to form the Midland Basin, were responsible for the lithofacies geometry of individual depositional systems.

When rapid tectonic subsidence ended in the Fort Worth Basin during the Middle Desmoinesian, Strawn deltas prograded across the filled basin and out onto the gradually subsiding Eastern Shelf of the Midland Basin. The predominant deltaic units that accumulated on the shelf comprise thin, multilateral, high-constructional lobate and elongate systems; maximum sandstone isolith thickness per genetic interval does not exceed 140 feet. In contrast, high-constructional systems of the middle Strawn that were deposited in the Haskell depocenter of the Knox-Baylor Trough and in the Bowie depocenter (at the northwestern margin of the Fort Worth Basin) formed linear, multistoried sandstone bodies involving more than 200 feet of net sandstone per genetic interval. In the Missourian the Bowie was predominantly a site of arkosic, fan delta sedimentation.

 

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