--> Detection of Carbonate Buildups: Aspects of a 3D Seismic Stratigraphic Interpretation of Pennsylvanian Age Upper Ismay Algal Mounds, Kiva Field, Paradox Basin, Utah, by C. L. C. Stewart; #90986 (1994).

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Abstract: Detection of Carbonate Buildups: Aspects of a 3D Seismic Stratigraphic Interpretation of Pennsylvanian Age Upper Ismay Algal Mounds, Kiva Field, Paradox Basin, Utah

Cindy L. Crawley Stewart

Kiva field produces oil and associated gas from carbonate buildups in the Upper Ismay zone of the Paradox formation at a depth of 5800 feet. The stratigraphic trap is formed by a lithologic change within the Upper Ismay zone from a limestone and dolomite reservoir facies to a thick offmound anhydrite facies. The estimated ultimate recovery under waterflood is 3,106 MBO + 3,689 MMcfg. Cumulative production from Kiva field as of 1/93 is 1,991 MBO + 3,023 MMcfg.

The 1984 discovery of Kiva field was the result of a geologic model that was confirmed by conventional 2D seismic data. The seismic data was carefully processed and took into consideration the cyclic nature of the geology in the Paradox formation.

After the confirmation well flowed 1050 BOPD + 750 Mcfgpd from the Upper Ismay, Meridian Oil and BWAB proceeded in January 1985 to acquire a 3D seismic survey over the possible extents of the new field. The results of that survey show that the 3D images the porous part of the algal mound and demonstrates mound morphology. The survey also demonstrates that the conventional 2D strike line images the crest of the mound from out of the plane of the section (sideswipe), and the 3D migration of the data volume is able to place the image of the mound into its proper position.

The ability to detect these prospective algal mounds using high quality seismic data makes these shallow oil reservoirs an excellent exploration target.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994