Petroleum and Natural Gas Fields in Wyoming Page: 13
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REVIEW OF OIL AND GAS FIELDS
conitic and carbonaceous. 'The producing in-
terval has an average permeability of 200
millidarcys per foot and an average porosity of
20 percent. The oil is reported to be under-
saturated, with a gas-oil ratio of less than 25
cubic feet per barrel.
The reported depth, in feet, to the top of
formations in a deep-test well in the NE1/4
sec. 23 is as follows: Claggett, 3,698; Eagle
4,344; Telegraph Creek, 4,550; Shannon, 4,886;
Cloverly, 7,628; Sundance, 7,890; Red Beds,
7,900; Tensleep, 9,140; Amsden, 9,259; Madi-
son, 9,493; and Big Horn, 13.0,580. Analysis of
oil from the Shannon sand is given on page
At least 49 wells have been drilled in or near
the Ash Creek field. Of these, 27 are oil pro-
ducers in the Shannon sand, 1 is a small gas
well, and 21 were plugged and abandoned.
Production (Wyoming only) for 1956 was
444,513 barrels of oil. Cumulative production
to the end of 1956 was 1,840,452 barrels. Fuel
gas to operate the production facilities is ob-
tained from a shallow gas well in the SW1/4
sec. 19. In July 1957 the oil was being trucked
approximately 100 miles to the pipeline at
The South Ash Creek field (fig. 6) was dis-
covered September 26, 1954, upon completion
of the No. 1 Hallworth well in the C NE-1/-
NE1/4 sec. 31, T. 58 N., R. 84 W. Initial pro-
duction by pumping was 260 barrels of 350
API gravity oil a day from the Shannon sand
at 4,886 to 4,918 feet. The log of this well
shows the depth, in feet, to the top of forma-
tions as follows: Teapot, 3,653; Parkman,
4,057; Claggett, 4,240; upper sandy zone,
4,635; Shannon (Ash Creek) sand, 4,885; and
pay zone, 4,886 to 4,902. The ground elevation
is 4,300 feet, and total depth was 4,960 feet.
Analysis of oil from the Shannon sand is
given on page 325.
At least 30 wells have been drilled in the
field. Of these, 22 were completed as oil pro-
ducers in the Shannon sand, and 8 were aban-
doned as failures. Production for 1956 was
774,384 barrels of oil. Cumulative production
to 1957 was 1,229,137 barrels. The oil from
this field is trucked also to Midwest, Wyo.
ASPEN, SPRING VALLEY, SULPHUR
CREEK, AND STOVE CREEK
The Aspen, Spring Valley, Sulphur Creek,
and Stove Creek fields (fig. 7) are in Tps. 13,
14, and 15 N., Rs. 117, 118, and 119 W., UITinta
County, in the southwest corner of the State.
They extend along the west flank of the
Meridian anticline, the axis of which trends
northeast-southwest, and the fields are within
an area 2 to 6 miles in width and 20 miles in
length. The northern part is known as the
Spring Valley field, the central part as the
Aspen field, and the southern part as the
Sulphur Creek field. The limits of the fields
have not been defined. The major structural
features of the area are the Absaroka fault on
the west and the Meridian anticline on the
east. The Knight formation, of Tertiary age,
is exposed on the surface over most of the
area, except in the vicinity of Sulphur Creek,
where Quaternary deposits cover Hilliard flat.
Ground elevations at wells throughout the area
range from 7,000 to 7,700 feet; the higher
elevations are in the Sulphur Creek area.
An oil spring near Hilliard, in the NW1/4
sec. 4, T. 13 N., R. 119 W., was well known to
early trappers who headquartered at the Fort
Bridger trading post. It is reported that
Brigham Young had a shallow well dug at
this place, and oil was skimmed off the sur-
face of the water and sold to emigrants or
carried to Salt Lake City in small quantities.
Various wells between 100 and 480 feet in
depth were dug from 1867 to 1886, in the
vicinity of the Brigham Young oil spring, but
it was not until 1900 and later that operators
drilled wells 100 to 2,000 feet deep in the
Aspen and Spring Valley areas and actually
obtained production. In 1955 not more than
15 wells in the entire area had been drilled
below 2,000 feet.
The Aspen field is in secs. 3 and 10, T. 14 N.,
R. 118 W. As early as 1903 a well in the
NW1/4NE1/4 sec. 10 produced some oil from
the Bear River formation from 862 to 897 feet.
However, little was done until 1927, when a
well in the NE1/4NW14 sec. 10 penetrated the
Bear River formation. The reported daily
initial production was 126 barrels of oil from
a depth interval of 898 to 911 feet. Three
wells were completed in 1927 and 1928 in the
Bear River formation at 838 to 1,238 feet;
the total initial daily production was 346 bar-
rels of 22 API gravity black oil. From the
date of discovery to June 1, 1957, about 23
wells had been drilled in the field, but 18
were abandoned as failures. Analysis of oil
from the Bear River formation is given on
The wells that produced oil have been shut
in except when they were pumped to furnish
oil for drilling operations. The small amount
of oil produced at Aspen has been used for
fuel or included in the Spring Valley produc-
The Spring Valley oilfield, in secs. 12, 13,
14, 22, 23, and 26, T. 15 N., R. 118 W., is on
a monocline that dips about 180 west. The
field was discovered in October 1900, incident
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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/m1/27/: accessed July 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.