Cody, Wyo.–based Thunder Hill Exploration (Thunder Hill) has surveyed in location to drill a vertical wildcat some 7 miles southeast of the small community of Greybull, Wyo., on the eastern flank of the Big Horn Basin. The company is seeking Permian reserves at the Poverty Flats #34-1, nw-se 34-52n-92w, Big Horn County, a projected 4,200’ Phosphoria test. This latest endeavor by the independent is located in a nonproducing township.
The closest exploratory activity to the Poverty Flats #34-1 is a shallow prospect scaling almost a mile to the southeast. Operated by B. Cookburn, the Federal #1, nw-nw 3-51n-92w, was abandoned in 1949 after bottoming in the Kimball at a depth of 843’. No cores were cut or tests were conducted in this failure.
A similar distance southeast of Thunder Hill’s Poverty Flats #34-1, Amerada Petroleum (Amerada) punched in a 4,610’ Madison test at the Unit #1, ne-nw 2-51n-92w. A total of four DSTs were performed in the wellbore—two in the Phosphoria and two in the Tensleep. The Phosphoria interval from 3,880’ to 3,926’ yielded 30’ of mud. A second test in the Permian between 4,094’ and 4,114’ indicated a wet reservoir, with 4,025’ of fresh water encountered. The deeper DSTs in the Tensleep across the overall interval at 4,125’–4,610’ tested wet. Based on logs, Amerada ran production casing and perforated the Phosphoria from 3,894’ to 3,906’. Following an acid frac, the company swabbed water with a trace of oil, and the attempt was plugged in 1955.
Roughly 1.5 miles southwest of Thunder Hill’s new location, Union Texas drilled a Madison prospect at the Paul #1, nw-sw 4-51n-92w. Bottoming in the Mississippian at a depth of 4,707’, DSTs were conducted in the Dinwoody and Tensleep at depths below 3,800’. No oil shows were recovered, and the well was abandoned in 1969.
Less than 2 miles northwest of the Poverty Flats #34-1, Clark Oil and Gas drilled a Tensleep test at the C2-F-52-9, sw-ne 28-52n-92w. This Pennsylvanian attempt was abandoned in 1962 after a DST in the Phosphoria reversed out only 30’ of mud. Although no production casing was run, a core cut in the Phosphoria from 3,955’ to 4,013’ did exhibit some bleeding oil. Log tops of the C2-F-52-9 include the Phosphoria at 3,948’ and the Tensleep at 4,195’ beneath a KB elevation of 4,195’.
The only other exploratory activity near Thunder Hill’s wildcat is nearly 1.5 miles to the northwest at a venture drilled by Amoco Production. The Pegasus-Federal #1, sw-ne 26-52n-92w, is a 4,200’ Tensleep test that was abandoned in 1984 with no significant shows reported.
Staking of the Poverty Flats #34-1 is part of exploration in a geological province new to Thunder Hill, who previously had a drilling program located in Goshen County in the extreme northern portion of Wyoming’s D-J Basin, where the company drilled four vertical wildcats with no success.
The nearest significant production to Thunder Hill’s latest activity is some 4 miles to the southeast at Torchlight Field, a multi-pay oil and gas reservoir that has cumulated more than 18.6 mmbo and 4.4 bcfg since 1935. This pool, which produces primarily from both the Madison and Tensleep at depths less than 4,500’, was discovered by surface mapping.
Early Morning Bakken Hunt