The Whistle Creek field is located about a mile west of the Garland oil and gas field in the northern Big Horn Basin area, Park County, Wyoming. The discovery well, Seaboard Oil Company's Unit No. 25-16, located in the NE, NW, SW, Sec. 16, T. 56 N., R. 98 W., was completed on November 6, 1951. It found that almost all permeable zones below the Mesaverde, productive elsewhere in the basin, had oil or gas shows; but only the Tensleep and a thin sand in the Morrison gave commercial drill-stem tests. The well was completed in the Tensleep at a total depth of 5,825 with a 30-foot penetration of the producing formation. The initial production was 417 B/D.

A second well is currently being drilled to test the madison. The two wells to date have proved an oil column of 52 feet in the Morrison (33 gravity oil) and 184 feet in the Tensleep (28 gravity oil). The Tensleep sand section is 143 feet thick with about 100 feet effective.

Detailed mapping in the outcropping beds of the Upper Cretaceous age suggested the possibility of closure on the west flank of the Garland anticline. The subsurface was detailed by seismograph prior to drilling.

Two new locations have been made; one a normal 40 acre stepout due south of the discovery well and the other of wildcat class about 3½ miles southeast in NE, SE, SW, Sec. 35, T. 56 N., R. 98 W.

The Whistle Creek feature is unitized with 5,360 acres included in the unit. The interests are: Seaboard Oil Company, 72%, C. H. Murphy, 24%, Amerada Oil Corporation, 4%. Seaboard Oil Company is the operator.

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