Petroleum and Natural Gas Fields in Wyoming Page: 10
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PETROLEUM AND NATURAL GAS FIELDS IN WYOMING
-- OIL WELL, SHUT IN
4 ABANDONED HOLE, SHOW OF OIL
+ DRY HOLE
CONTOURS DRAWN ON RUSTY CLAY*IRON STONE
BED ABOUT 575' BELOW TOP OF PIERRE SHALE
DATUM 18 MEAN SEA LEVEL
GEOLOGY BY H.J. PACKARD AND C.S. LAVINGTON.
FIGURE 4.-Structure-Contour Map of Ant Hills Dome, Niobrara County, Wyo.
(Adapted from Bureau of Mines Bulletin 418.)
drilled in the area but were abandoned as 1937. This unit plan has since been termi-
The oil that had been in storage for a num- The North Ant Hills oilfield (fig. 5) is in
ber of years is analyzed on page 323. Analysis secs. 1 and 2, T. 37 N., R. 63 W., Niobrara
of water from the Fall River (Dakota) and County, about 3 miles north of the Ant Hills
Minnelusa formations is shown in table 9 (p. field. The Fox Hills formation is exposed at
292). the surface at an elevation of approximately
Production for 1956 was 3,095 barrels of oil. 4,150 feet.
Cumulative production to the end of 1956 was The discovery well, in the SW1/4W1/4SW1/4
31,231 barrels. sec. 1, was completed on August 18, 1947.
A unit plan for developing and operating Initial production by pumping of 104 barrels
the Ant Hills Dome area was approved by the a day of 35.6 API gravity oil was obtained
Secretary of the Interior on November 15, from the Fall River (Dakota) sand through
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Biggs, Paul & Espach, Ralph H. Petroleum and Natural Gas Fields in Wyoming, report, 1960; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc38797/m1/24/: accessed July 28, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.