Petroleum and Natural Gas Fields in Wyoming Page: 23
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REVIEW OF OIL AND GAS FIELDS
gas from the Frontier and Dakota formations
are given in table 8 (p. 287). Analyses of wa-
ter from the surface, Frontier, Dakota, Nug-
get, Phosphoria, and Weber are given in table
9 (p. 292).
Of the 21 wells drilled in the Middle Bax-
ter Basin area, 9 have produced gas. In Sep-
tember 1955 five wells were producing gas.
Two of the wells produced from the Frontier,
two from the Dakota, and one from the Lako-
ta. Average daily production per well dur-
ing 1956 was 173,000 cubic feet. Gas produced
at Middle Baxter Basin to January 1, 1957,
amounted to 11,607 million cubic feet.
The gas from the field is compressed be-
fore entering the main :pipeline to Rock
Springs, Wyo., and Salt Lake City, Utah.
The South Baxter Basin gasfield (fig. 12)
is in Tps. 16, 17, and 18 N., Rs. 103 and 104 W.
Structurally, the South Baxter Basin field
comprises three areas, separated by faulting.
The north area is comparatively free from
faulting, whereas the south area is highly
faulted. The Bishop conglomerate of Tertiary
age covers part of the north area at an eleva-
tion of approximately 8,600 feet.
Small showings of oil and gas had been
found in South Baxter Basin as early as 1916,
but commercial accumulations of gas were not
proved until August 1922, when a well in the
NE1/,SE1/, sec. 16, T. 16 N., R. 104 W., which
flowed 1 million cubic feet daily from the
Frontier formation at 2,050 to 2,135 feet, pro-
duced an estimated 36 million cubic feet daily
from the Dakota sand at 2,475 to 2,515 feet.
Another well drilled during 1923, in sec. 21,
T. 16 N., R. 104 W., produced 2 million cubic
feet daily from the Frontier formation at
2,440 to 2,460 feet and 60 million cubic feet
daily from the Dakota sand at 2,828 to 2,900
Thirty-one gas wells were completed in the
field to 1955. Sixteen yielded sweet gas (free
from hydrogen sulfide) from the Frontier for-
mation; initial daily production ranged from
11/4 to 18 million cubic feet. Initial shut-in
wellhead pressure ranged from 630 to 780
p.s.i. and averaged 730 pounds. Depth to the
top of the producing formations ranged from
1,800 to 2,700 feet. Fourteen wells completed
in the Dakota sand produced sour gas (con-
taining 65 to 85 grains of hydrogen sulfide
per 100 cubic feet of gas), and one produced
sweet gas. Initial daily production ranged
from 7 to 65 million cubic feet; shut-in well-
head pressure ranged from 735 to 875 p.s.i.
and averaged 780 pounds. Depth to the sand
ranged from 2,100 to 3,570 feet. One well was
dually completed in the Frontier and Dakota
formations. Deep drilling in the South Bax-
510267 0o--60 -3
ter Basin field has shown that the Nugget and
Weber sandstones contain water only.
During 1956, based on the yearly produc-
tion, the wells in the South Baxter Basin field
produced an average of 495,000 cubic feet of
gas daily per well. In September 1955, 16
wells in the field were producing from the
Frontier formation, and 8 wells were pro-
ducing from the Dakota sand. Analyses of
gas from the Frontier and Dakota formations
and water from the Frontier, Dakota, Mor-
rison, Sundance, and Weber formations are
given in tables 8 and 9 (pp. 287 and 292, re-
spectively). To January 1, 1957, 106,674 mil-
lion cubic feet of gas had been produced at
South Baxter Basin field.
In September 1955 the gas from the Fron-
tier formation was compressed and entered the
main pipeline to Salt Lake-City, Utah, while
the gas from the Dakota formation was piped
to Rock Springs, Wyo., for removal of hydro-
gen sulfide before distribution for domestic
and industrial use.
The three Baxter Basin fields-North, Mid-
dle, and South-represent one of the major gas-
field developments of Wyomings.
The Bearcat oilfield is in sec. 12, T. 56 N.,
R. 100 W., Park County, about 4 miles south-
west of the South Elk Basin field. The field
appears to be on the west flank of the Elk
Basin structure. Recent alluvial deposits
cover the surface at an elevation of 5,040 feet.
The discovery well, in the NE1/4NW1/4NE1/4,
sec. 12, was completed May 27, 1955. Initial
flowing production was 121 barrels of 460 API
gravity oil a day from the Dakota sand at
7,942 to 7,950 feet. Production declined rap-
idly to 80 barrels of oil a day. The well was
later drilled to a total of 9,509 feet and the
Phosphoria zone perforated between 9,473 and
9,494 feet. Following acidizing with 3,000
gallons, a swabbing test recovered 5 barrels of
oil an hour. The well was then plugged back
to 8,010 feet and recompleted in the Dakota
sand. The well log shows the depth, in feet,
to the top of formations as follows: Mesa-
verde, 3,668; Cody, 4,700; Frontier, 6,421; "A"
sand, 6,529; First Frontier, 6,609; Second
Frontier, 6,702; Third Frontier, 6,750; Fourth
Frontier, 6,853; Mowry, 6,978; Muddy, 7,618;
Cloverly, 7,844; Dakota, 7,943; Fuson, 7,980;
Lakota, 8,040; Morrison, 8,070; Sundance,
8,430; Gypsum Spring, 8,755; Chugwater,
8,932; Dinwoody, 9,440; and Phosphoria,
Oil produced at the field amounted to 6,493
barrels in 1955 and 2,276 barrels in 1956. The
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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/m1/37/: accessed May 28, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.