ABSTRACT: Table Rock Field-Frontier Formation

DICKINSON, ROGER G., Texaco Exploration and Production, Denver, CO

Significant potential exists in the frontier formation in portions of the Great Divide and Washakie basins of southern Wyoming

Texaco drilled the Table Rock Unit no. 104 in 1991 to test the potential of the Frontier Formation at Table Rock field. Table Rock field is located in south-central Wyoming, on the eastern flank of the Rock Springs uplift. The field is a large structural anticline that produces from Lewis, Almond, Blair, Nugget, and Weber horizons. The nearest significant Frontier Formation production is found 30 mi to the west on the Rock Springs uplift. In the Table Rock field, a total of 22 wells had been drilled through the Frontier Formation to produce from deeper objectives. The Frontier Formation was not an early objective because the sands are thin on top of the structure and had very low permeability.

The Frontier Formation sandstone at Table Rock field is (1) well sorted and contains no significant amounts of depositional clay, and (2) is a sublitharenite with 5-10% sedimentary, volcanic, and metamorphic rock fragments. The Frontier sand thickens from the south end of the field to the north.

The discovery well, the Table Rock Unit no. 104, encountered 37 ft of Frontier Formation sandstone containing high-pressure dry gas. Stabilized bottom-hole pressure was 11,100 psi. The zone was fracture stimulated with 200,000 lbs of propant at a maximum pressure of 9600 lbs. The initial production rate for the well was 4300 MCFGD.

AAPG Search and Discovery Article #91017©1992 AAPG Rocky Mountain Section Meeting, Casper, Wyoming, September 13-16, 1992 (2009)