Petroleum and Natural Gas Fields in Wyoming Page: 2
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PETROLEUM AND NATURAL GAS FIELDS IN WYOMING
largely from the Bridger and Wind River Basins. Some gas has been found
in all the geologic basins of Wyoming except its portion of the Denver-Julesburg
Drilling for oil and gas in Wyoming has followed the same trends as found
in other major oil-producing areas of the country. As early as 1870, small
quantities of oil were recovered from seeps or springs near Casper, Evanston,
and Moorcroft. Later, the "spring-pole" method was used when drilling a few
hundred feet, then the "churn" or cable-tool drilling for a few thousand feet,
and, finally, the rotary drilling up to 20,000 feet. The unit well No. 1 in the
West Poison Spider field was completed in 1948, with the producing interval
from 14,187 to 14,309 feet. For several months after its completion this oil
well ranked as the world's deepest producing well.
Crude-oil analyses included in this bulletin indicate that the chemical-
physical properties of the oils produced in Wyoming vary considerably. The
terms "black" and "green" oils appear throughout the report. Black or heavy
oils have low API gravities, high sulfur contents, and usually low yields of
gasoline. Green or light oils have high API gravities, little or no sulfur con-
tent, and yield considerable gasoline. Fields, such as Grass Creek and Oregon
Basin fields, producing black oils have had erratic production over the years
as shown in the table of oil produced by fields and by years. Considering the
fields by a basin grouping, it is noted that the majority of the oil found in
the Big Horn Basin has been of the black oil type. Most of the oil found in
the Powder River Basin has been of the green or light oil type.
The bibliography (pp. 531-538) of 292 references offers additional study of
Wyoming's oil and gas fields to those who are interested in more detail than
is found in this report.
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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/m1/14/: accessed February 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.