Petroleum and Natural Gas Fields in Wyoming Page: 45
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REVIEW OF OIL AND GAS FIELDS
about 6,030 feet. A major east-west fault cuts
across the north end of the structure. The
dome has an independent closure of about 600
The field was discovered in January 1920,
when a well in the SE1/4SE1/ sec. 4 was com-
pleted that produced initially 50 barrels of
22o API gravity black oil daily from the Sun-
dance formation at 1,100 to 1,135 feet. Later
in 1920 a well in the NW1/4NW1 sec. 10 made
an initial daily production of 300 barrels of
320 API gravity black oil from the Embar
lime at 2,070 to 2,078 feet. Twenty-four wells
have been drilled on the structure. The wells
completed in the Sundance formation were
1,078 to 1,135 feet deep and produced initially
50 to 100 barrels of oil a day. The wells com-
pleted in the Embar lime were 2,046 to 2,220
feet deep and produced initially as much as
500 barrels of oil a day. The Dakota sand was
50 feet thick and produced flowing water; the
Tensleep sand also was water bearing. In 1956
a dry hole was drilled in the NW1/4NW'1/
NW1/% sec. 10 to the Embar lime. The forma-
tions and their depth, in feet, in this well were
recorded as follows: Muddy, 573; Dakota, 658;
Lakota, 753; Morrison, 830; Sundance, 1,250;
Alcova, 1,450; and Embar, 2,128. Analyses
of the oil from the Sundance and Embar for-
mations, and water from the Dakota and Sun-
dance formations are given on pages 342 and
343 and in table 9 (p. 293), respectively.
Oil production during 1956 was 4,738 bar-
rels. Cumulative production to the end of
1956 amounted to 55,307 barrels for the field.
There were 2 shut-in oil wells and 22 aban-
doned wells in the field as of December 31,
1957. The oil is trucked to Casper, Wyo.
The Bonanza field (fig. 27), in T. 49 N., R.
91 W., Big Horn County, is an unsymmetrical
northwest-pitching fold slightly offset on the
northwest from the Manderson anticline and
on the southeast from the Nowood anticline.
Dips on the northeast flank range from 0 to
54, and those on the southwest flank range
from 0O to 180. The oldest outcropping for-
mation is the Thermopolis. The topography
is quite rugged; the elevation ranges from
4,290 to 4,650 feet.
The first oil discovered in the Big Horn
Basin came from an oil seep (Mowry?) on
the Bonanza anticline in 1885. The oil was
burned in lamps because of a shortage of
kerosine in the area. The discovery of the
seep led to the drilling of several wells in the
area, one in 1888 and several in the early
1900's. Most of these wells were shallow holes
and did not test below the shale beds. The
first commercial production was obtained in
December 1950, when a well in the SW1/NE1/
sec. 26 flowed 1,200 barrels of 36 API gravity
oil daily from the Tensleep sandstone at 2,483
to 2,528 feet. During 1951 and 1952, 53 wells
were drilled, 47 of which were oil wells in the
Tensleep sand. Initial daily oil production of
these wells ranged from 70 to 2,250 barrels
and averaged 600 barrels per well. The log
of the discovery well showed the following
depth, in feet, to the top of formations: Muddy
sand, 260; Dakota, 675 (water); Sundance,
1,010; Gypsum Spring, 1,295; Chugwater,
1,480; Dinwoody, 2,280; Phosphoria, 2,375;
and Tensleep, 2,483. Analyses of oils from
the seep and the Tensleep formation are given
on pages 343 and 344. Analyses of water from
the Lower Cloverly and Tensleep formations
are included in table 9 (p. 293).
During January 1957 the 49 wells in the
field produced at a combined rate of 10,469
barrels of oil daily. In 1956, 5,066,609 barrels
of oil was produced to bring the cumulative
total for the field to 18,899,512 barrels.
Pipelines from the field connect with pipe-
lines to both Billings, Mont., and Casper, Wyo.
BOONE DOME AND NORTH BOONE
The Boone Dome gasfield (fig. 28), in secs.
9, 10, and 15, T. 35 N., R. 85 W., Natrona
County, is on a small anticline that has about
100 feet of closure. The Parkman sandstone
member of the Mesaverde formation outlines
most of the structure and dips .20 to 30 on
the east and west flanks. The Steele shale
forms the surface of the structure at an eleva-
tion range of 5,900 to 5,950 feet.
The field was discovered in August 1923 on
completion of a well in the NE1ANW1/4 sec. 15
that produced about 2 million cubic feet of gas
daily from the Shannon sand. Production was
from a depth interval of 1,565 to 1,635 feet.
The shut-in wellhead pressure was 500 p.s.i.
When the well was deepened, additional gas
was found in the Frontier sand at 2,200 feet.
The volume of the gas from the two sands was
4 million cubic feet a day. The shut-in well-
head pressure was 760 p.s.i. In 1919 a well
drilled in the SE1/4SW 1/ sec. 4 flowed ap-
proximately 2 million cubic feet of gas daily
from the Shannon sand at 1,580 to 1,620 feet;
the well was plugged and abandoned, however.
In 1923 and 1925 five gas wells were completed
with initial daily production ranging from 1
to 4 million cubic feet. In 1956 and 1957 two
gas wells were completed in sec. 10. The pro-
ductive zone was the Frontier sand at a depth
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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/m1/59/: accessed January 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.