Petroleum and Natural Gas Fields in Wyoming Page: 27
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REVIEW OF OIL AND GAS FIELDS
A unit plan for developing and operating
the Beaver Creek field, with Pan American
Petroleum Corporation as the operator, was
approved by the Secretary of the Interior
September 1, 1937.
Bell Springs is a small gasfield (fig. 14) in
sec. 6, T. 23 N., R. 88 W., Carbon County.
The structure is a small high on the west end
of a long, narrow anticline which has about
150 feet of independent closure. Steele shale
is exposed on the surface, which has an aver-
age elevation of 6,500 feet.
In 1924 a well drilled to the Frontier at
1,920 feet produced gas on test at the rate of
15 million cubic feet a day. However, there
is no record of production before 1944 when a
well in the NE1SW1/4 sec. 6 was completed
dually in the Dakota and Sundance forma-
tions. The initial production was 4 million
cubic feet of gas a day with a shut-in wellhead
pressure of 1,100 p.s.i. The log of this well
shows the following depth, in feet, to the for-
mation top: Frontier, 819; Muddy, 1,690;
Cloverly, 1,844; Sundance, 2,093; Alcova,
2,822; Chugwater, 2,838; and Tensleep, 3,778.
Analyses of the gas from the Dakota and Sun-
dance formations and of water from the La-
kota and Tensleeps sandstones are given in
tables 8 and 9 (pp. 287 and 292, respectively).
The field produced 34.3 million cubic feet
of gas during 1953. A total of 594.9 million
cubic feet had been produced through 1953.
The field was shut in for abandonment in 1954.
Bertha is a one-well field in sec. 27, T. 54 N.,
R. 69 W., Campbell County. The Tullock
member of the Fort Union formation forms
the surface. The general area is highly
eroded. Seismic study of the area was made
before drilling. Surface elevation at the well
is about 4,100 feet.
The discovery well in the SE1/4SE1/4 sec. 27
was completed in June 1955 for an initial daily
production of 40 barrels of oil. The producing
zone was the Newcastle sand at a depth of
5,442 to 5,444 feet. An offset well to the east
proved to be a dry hole. Analysis of oil from
the discovery well is given on page 333. On
October 29, 1957, the well was producing 30
barrels of oil and 1 barrel of water daily.
Oil produced at Bertha field amounted to
2,889 barrels in 1955 and 6,528 barrels in 1956.
The oil is hauled to Gillette,. Wyo., by truck.
The Big Hollow oilfield is in secs. 6 and 7,
T. 15 N., R. 75 W., Albany County. Appar-
ently the structure is a northward-plunging
anticline. The Niobrara formation is exposed
on the surface, which has an average elevation
of 7,300 feet.
The first oil well was drilled in 1915 but
proved noncommercial. The first commercial
well was drilled in 1938 in the SW1/4SE1/4 sec.
6; the initial daily production was 25 barrels
of 210 API gravity oil from the Muddy sand
at 890 to 920 feet. The first reported produc-
tion was in 1939. The log of a deep well
drilled in 1947, in the SW1/4SE1/4 sec. 7,
showed the following depth, in feet, to the top
of formations: Muddy, 800; Dakota, 920;
Morrison, 1,131; Sundance, 1,430; Chugwater,
1,645; and total depth in the Casper, 2,753.
Numerous wells have been drilled in or near
the field; most of them were dry holes. An-
alyses of the oil from the Muddy sand and of
water from the Muddy and Tensleep forma-
tions are given on page 333 and in table 9 (p.
As of January 1, 1957, there were 2 shut-in
oil wells and 28 abandoned wells. No produc-
tion has been reported since 1949. Cumulative
production to the end of 1956 was 11,046 bar-
rels of oil. The oil was trucked from the field.
BIG MEDICINE BOW
The Big Medicine Bow oilfield (fig. 15),
known also as Medicine Bow, is in the south-
east part of T. 21 N., R. 79 W., Carbon County.
It is situated on the Medicine Bow anticline,
a pronounced asymmetrical fold surrounded
entirely by escarpments of the Mesaverde for-
mation. The length of the fold within the
rim is about 7 miles, and the maximum width
is about 3 miles. Dips on the west side of the
anticline range from 10 to 20, and those on
the east are 50. The north plunge of the fold
ranges from 100 to 340 and the south plunge
from 10 to 50, increasing rapidly at the ex-
treme south end. The structure has a total
closure of about 2,900 feet; more than 10
square miles is included within the lowest
closing contour. The Steele shale is exposed
on the crest of the structure. Surface eleva-
tion ranges from 6,700 feet at the Medicine
Bow River to 7,330 feet on the crest of the
In June 1935 a well in the SE1/NE14 sec.
26 was completed with an initial daily pro-
duction of 81 million cubic feet of wet gas
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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/m1/41/: accessed March 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.