Petroleum and Natural Gas Fields in Wyoming Page: 65
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REVIEW OF OIL AND GAS FIELDS
T. 40 N., R. 66 W.; the width of the trend
varies from less than 1 mile to about 6 miles.
The structure is a monoclline dipping at an
average of 2 to the southwest, away from the
Black Hills. There is no appreciable struc-
tural closure between the reservoirs. Oil has
accumulated in stratigraphic traps formed by
facies changes between sandstone and shale
components of the Newcastle sandstone. The
Newcastle sandstone is near the top of the
Lower Cretaceous series. Because it is the
most important oil-productive formation in
the area, the following detailed section is
given to show the character of the sandstone
at its type locality.
Section of Newcastle sandstone on U.S. Highway
85, 0.4 qf a mile northeast of its junction with
Highway 16 in Newcastle 1
Sandstone, gray to brownish, very close
to the top of the Newcastle -----
Clay shale, gray, and brown, well bedded_
Clay, black, carbonaceous_
Sandstone, brown, nodular, carbonaceous_
Clay, carbonaceous, and black shale---..
Clay, gray, sandy at top_
Clay, black, carbonaceous, almost impure
Sandstone, gray, and some gray clay --
Sandstone, gray _ _ _
Clay, gray--------------- -----
Sandstone, gray, hard
Clay, carbonaceous, sandy
Sandstone, gray, carbonaceous -
Clay, gray, carbonaceous, irregular - - -
Clay, gray, sandy, nodular, carbonaceous_
Sandstone, gray - -- --- ____-
Clay, gray, sandy, carbonaceous. _....
Sandstone, gray, slightly carbonaceous.
Very close to base of the Newcastle___
Total _ _ _ _ _ _ _ _ _ _ _ _ _ _
x Taken from Geological Survey Oil and Gas Investi-
gations Map 103, 1949.
The general terrain of the area consists of
rolling hills, with steeply eroded gullies and
intermittent streams draining toward the
South Fork of the Cheyenne River. The Fort
Union and Lance formations are exposed in
the area at elevations ranging from 4,200 to
Clareton.-This field (fig. 39) has been desig-
nated as all of the area in T. 43 N., Rs. 64, 65,
and 66 W., Weston County. The discovery
well, in the SW1/ sec. 16, T. 43 N., R. 65 W.,
was completed August 15, 1950. Initial flow-
ing production was 40 barrels of oil a day
from the Newcastle (Muddy) sand, which had
been shot with 60 quarts of solidified nitro-
glycerin in the interval from 6,147 to 6,161 feet.
Reported initial production of the wells in the
field ranged from 10 to 2,640 barrels of oil a
day. The average initial production was 298
barrels of oil a day. The log of the discovery
well shows the depth, in feet, to the top of
formations as follows: Niobrara, 4,695; Wall
Creek (Frontier), 5,032; Newcastle, 6,121;
shale break, 6,148; and second sand (New-
castle), 6,160. Individual well records show
that at least three separate oil-bearing sand
lenses occur in the Newcastle sandstone in the
Clareton field. Analyses of oil from the New-
castle sandstone are given on page 353. Re-
ported API gravity of the oil varies from
39 to 43.
By January 1, 1957, 252 oil wells, 12 shut-in
oil wells, and 86 dry holes had been completed
in the field. Production for 1956 was 1,253,197
barrels of oil. Cumulative oil production to
the end of 1956 was 9,717,103 barrels. All gas
produced with the oil, except that used on the
leases, has been vented to the air. An esti-
mated 14,599 million cubic feet of gas has been
produced to the end of 1956.
Black Thunder Creek.-This field (fig. 40) is
in T. 42 N., R. 66 W., Weston County, and is
southwest of Clareton field. The discovery
well, in the NE1/4 sec. 23, was completed in
April 1953. Initial daily production by pump-
ing was 206 barrels of 43.4 API gravity oil
from the Newcastle sandstone between 6,868
and 6,908 feet. As many as four separate oil-
bearing zones have been reported in the New-
castle sandstone in the Black Thunder Creek
field. Reported initial daily production of
wells in the field ranged from 17 to 2,328 bar-
rels of oil. The average initial daily produc-
tion was 378 barrels of oil. No water is pro-
duced with the oil from the Newcastle sand-
stone. The log of a well in the NE1/4NW1/4
sec. 14 shows the depth, ih feet, to the top of
formations as follows: Niobrara, 5,330; Car-
lile, 5,870; Newcastle, 6,912; first pay (New-
castle), 6,941; second pay (Newcastle), 6,988;
and total depth, 7,055. Analysis of oil from
the Newcastle sandstone is given on page 354.
By January 1, 1957, there were 165 oil wells,
15 shut-in oil wells, and 18 wells abandoned
in the field. At least three wells were drilled
into the Dakota sandstone without finding oil
or gas. Oil produced at the field during 1956
amounted to 754,188 barrels. Cumulative pro-
duction to the end of 1956 amounted to 3,941,-
908 barrels of oil and an estimated 6,590 mil-
lion cubic feet of gas produced with the oil.
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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/m1/79/: accessed March 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.