Petroleum and Natural Gas Fields in Wyoming Page: 211
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REVIEW OF OIL AND GAS FIELDS
The discovery well in the C SE1/SE1/4 sec.
36, T. 35 N., R. 89 W., was completed in No-
vember 1955. Initial daily production was
30 barrels of oil and 156 barrels of water from
a sand in the Cody-shale formation. In 1956
two additional wells were completed in the
field. These wells produced from a higher or
"upper" zone of the Cody shale. All of the
next three wells drilled were completed as dry
holes. The log of the discovery well shows
the depth, in feet, to the top of formations
as follows: Cody, 2,130; Frontier, 4,734;
Mowry, 5,398; Muddy, 5,698; Dakota, 5,800;
Lakota, 5,869; Morrison, 5,958; Sundance,
6,159; Gypsum Spring, 6,360; Nugget, 6,452;
Chugwater, 6,510; Curtis, 6,770; and Alcova,
6,822. Analysis of a sample of oil from the dis-
covery well is provided on page 470.
In February 1958 all three wells were shut
in, and the field was not operated. Oil pro-
duced at the field during 1955 amounted to
1,426 barrels and during 1956 to 3,494 barrels.
The oil was hauled from the field by truck.
RALSTON
The Ralston oilfield is in secs. 15 and 16, T.
56 N., R. 101 W., Park County, about 6 miles
southeast of Badger Basin field. The area was
studied by seismic methods before and after
the first well was drilled. Alluvial deposits
form the surface at an elevation of about 4,450
feet.
The discovery well, the No. 1 unit, in the
C NE1/4NW1/4 sec. 16, was completed in the
Third Frontier sand on July 7, 1953. Initial
flowing production was 200 barrels of 48.9
API gravity oil a day from the Third Fron-
tier sand at 10,117 to 10,135 feet. The gas-oil
ratio was 2,450:1. In July 1954 the well was
deepened to test the Phosphoria, Tensleep, and
Madison formations. On October 23, 1954, the
well was recompleted in the Phosphoria lime
after the Tensleep and Madison formations
were tested. Initial flowing production was
252 barrels of oil and 5 barrels of water a day
from 12,640 to 12,680 feet. The gas-oil ratio
was 4,600:1. The log of the well shows the
depth, in feet, to the top of formations as
follows: Claggett, 6,735; Eagle, 7,458; Vir-
gelle, 7,618; Cody, 7,959; Frontier formation,
9,609; First Frontier sand, 9,687; Second
Frontier sand, 9,824; Third Frontier sand,
9,975; Mowry, 10,552; Muddy, 10,776; Clo-
verly, 10,993; Morrison, 11,162; Sundance,
11,590; Gypsum Spring, 11,968; Chugwater,
12,100; Dinwoody, 12,167; Phosphoria, 12,632;
Tensleep, 12,682; Amsden, 12,892; Darwin, 13,-064; and Madison, 13,078. Oil from the Phos-
phoria lime is analyzed on page 471.
Production for 1956 was 10,816 barrels of
oil. Cumulative production to 1957 was 37,608
barrels. The oil is trucked from the field.
The Ralston unit, approved June 26, 1953, con-
sists of 6,432 acres.
RAVEN CREEK AND SLATTERY
The Raven Creek field is in sec. 1, T. 48 N.,
R. 69 W., Campbell County. The area was
studied by seismic methods before drilling.
The Tullock member of the Fort Union for-
mation is exposed on the surface at an eleva-
tion of 4,342 feet.
The discovery well in the SE1/4SE1/4 sec. 1
was completed in November 1956. Initial pro-
duction was 96 barrels of oil and about 20
barrels of water from the Dakota formation
from 6,763 to 6,817 feet. On October 30, 1957,
the well was shut in. During 1956, 665 barrels
of oil was produced at the field. The oil is
hauled by truck.
Slattery field is in secs. 24, 25, and 36, T.
49 N., R. 69 W., Campbell County. It is across
the Belle Forche River and straight north of
the Raven Creek field. The area was studied
by seismic methods before drilling. The Tul-
lock member of the Fort Union formation is
exposed on the gently sloping hillside, where
the elevation is 4,284 to 4,418 feet.
The discovery well in the C NW1/4SWI/
sec. 24 was completed in December 1956. Ini-
tial daily production was 35 barrels of oil from
the Newcastle sand at 6,558 to 6,566 feet. The
Dakota sand was water bearing in this well.
One well in sec. 25 and one in sec. 36 were com-
pleted during 1957. Oil from the Newcastle
sand is analyzed on page 472.
During 1956, 1,203 barrels of oil was pro-
duced at the field. The oil is hauled by truck.
RAWHIDE
The Rawhide field is a noncommercial oil
discovery in sec. 4, T. 48 N., R. 101 W., Park
County, about 7 miles southeast of the Spring
Creek field. The structure appears to be a
continuation of the Spring Creek anticline.
This plunging nose is north of the Rawhide
syncline. The Cody shale is exposed on the
surface at an elevation of 6,240 feet.
The discovery well in the NW1/4SW1/4SE1/
sec. 4 was completed March 8, 1953. Initial
daily production by pumping was 9 barrels
of 17.70 API gravity oil and 28 barrels of
water from the Phosphoria lime at 5,057 to211
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Biggs, Paul & Espach, Ralph H. Petroleum and Natural Gas Fields in Wyoming, report, 1960; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc38797/m1/241/: accessed May 11, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.