--> Abstract: Seismic Structure and Seismic Stratigraphy of the Giant Aneth Field and Its Satellite Fields of Southeast Utah, by J. F. Johnson and W. G. Groen; #90993 (1993).

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JOHNSON, JOHN F., and WILSON G. GROEN, Chuska Energy Company, Denver, CO

ABSTRACT: Seismic Structure and Seismic Stratigraphy of the Giant Aneth Field and Its Satellite Fields of Southeast Utah

Extensive seismic coverage in and around the greater Aneth field reveals much about the structure and stratigraphy of the Pennsylvanian Paradox Formation. The terminus of a northward-projecting nose of the Defiance uplift created a structural platform active throughout most of Late Pennsylvanian, and served as the foundation for the Aneth carbonate platform during upper Paradox deposition. Seismic and subsurface control demonstrate that the northwest-southeast-trending Four Corners lineament coincides with, and probably acted as, a control on salinity concentrations in the marine environment. Higher salinities northeast of the Four Corners lineament, along with the positive structural position of the platform, contributed to conditions favoring growth of algal mounds in the Aneth area during deposition of Desert Creek stage of Paradox Formation.

The Aneth field is a complex of coalesced algal mounds and associated facies covering 75 sq mi. Surrounding Aneth field are numerous satellite mounds (from under 30 to over 200 ac in size) that are identifiable with high-resolution common-depth-point seismic. Seismic expression of the algal mounds are characterized by one or more of the following: (1) isochron thickening of the Desert Creek unit; (2) isochron thinning of the overlying Ismay

unit; (3) amplitude dimming of the Desert Creek reflector; and (4) a "doublet" development of the Desert Creek event. Calibrated amplitude variations within the mound seismic anomaly are in part a response to reservoir porosity and can be employed in mapping reservoir distribution.

AAPG Search and Discovery Article #90993©1993 AAPG Rocky Mountain Section Meeting, Salt Lake City, Utah, September 12-15, 1993.