--> Abstract: Fifty Year Old Frio/Vicksburg Cage Ranch Field in Brooks County, Texas is Rejuvenated with 3D, by O. Hopkins; #90932 (1998).

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Abstract: Fifty Year Old Frio/Vicksburg Cage Ranch Field in Brooks County, Texas is Rejuvenated with 3D

HOPKINS, OWEN
Suemaur Exploration, Corpus Christi, TX

Suemaur Exploration, as a result of a 1994 3D seismic shoot over the apparently depleted 50-year-old Frio/Vicksburg Cage Ranch Field in central Brooks County, Texas, has rejuvenated the field subsequent to the 1995-96 drilling of six wells with eight completions in both normal pressure Frio sands and abnormal pressure Vicksburg sands.

Cage Ranch Field, discovered in 1947 by Shell had produced 99 billion cubic ft (BCF) of gas and 850 thousand barrels of condensate (MBC) from 36 wells in 64 completions. By 1994, production was less than 1 million cubic ft of gas per day (MMCFD) and 16 barrels of condensate a day (BCPD).

The 3D interpretation identified three major differences in our pre and post drill maps. The first was that there was no roll, or west dip downthrown to the Vicksburg flexure at the Middle Frio. Suemaur then drilled the highest Frio wells to date in the field. Secondly, the crest of the underlying Vicksburg structure was not coincident with the overlying Frio structure, but was over a mile south, enabling us to make the first commercial Loma Blanca sand Vicksburg age completion in the field, with the 710-1 well completed for 4.6 MMCFD and 175 BCPD. Thirdly, a major arcuate, down-to-the-south embayment Vicksburg age fault was identified on the southeast flank of Cage Ranch enabling us to drill the discovery well for Hook Field.

AAPG Search and Discovery Article #90932©1998 GCAGS/GCS-SEPM Meeting, Corpus Christi, Texas