Petroleum and Natural Gas Fields in Wyoming Page: 11
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REVIEW OF OIL AND GAS FIELDS
R. 63 W.
LEGEND W 'LLL IAIUS,
O OIL WELL, DAKOTA SS.
* OIL WELL, DAKOTA AND LAKOTA SS.
-- OIL WELL, ABANDONED
- DRY HOLE
FIGURE 5.-Map of North Ant Hills Field, Niobrara County, Wyo.
(Adapted from Federal Geological Survey map.)
perforations in the casing between 4,823 and
4,832 feet. The log of the well shows the
depth, in feet, to the top of formations as
follows: Pierre, 350; Niobrara, 2,900; Nio-
brara chalk, 3,310; Wall Creek, 3,605; Belle
Fourche, 3,960; Mowry shale, 4,505; New-
castle (Muddy), 4,641; and Fall River
(Dakota), 4,821. Analyses of oil from the
Fall River (Dakota) and Lakota sands are
shown on pages 323 and 324.
Eight wells have been drilled in the area.
Of these, three are producing oil wells, two
have been suspended indefinitely, and three
were abandoned as failures. Production in
the second completed oil well comes from the
Fall River sand. The third well was dually
completed in the Fall River and Lakota sands.
Production for 1956 was 8,873 barrels of oil.
Cumulative production to the end of 1956 was
86,935 barrels. The oil is trucked from the
ARMINTO AND LOX
The Arminto and Lox structures are on a
line of folding that extends northeast and
southwest through T. 37 N., R. 86 W., Natrona
County. The Arminto structure, an asym-
metrical anticline in secs. 17 to 20, inclusive,
is estimated to have 250 feet of independent
closure. Formations on the southwest flank
dip as much as 70 and those on the northeast
flank as much as 250. The Steele shale is ex-
posed at the surface.
In 1917 a well drilled in the SE1/4 sec. 18
through the Second Wall Creek sand produced
approximately 200,000 cubic feet of gas daily.
In 1923 a well in the NW1/ sec. 20 produced
gas at the rate of about 5 million cubic feet
daily from the Wall Creek sands at depths
of 1,787 to 1,930 feet. It later was drilled to
the Lakota sand to a depth of 3,535 feet but
was plugged back to the Wall Creek sands and
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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/m1/25/: accessed February 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.