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There are at least 45 named oil fields in Montana according to the U.S. Geological Survey, Board of Geographic Names. The USGS defines oil field as: "Area where petroleum is or was removed from the Earth." [1] An oil field is a region with an abundance of oil wells extracting petroleum (crude oil) from below ground.
This early attempt to exploit the Bakken Formation using horizontal drilling failed because the wells were placed in the shale members of the Bakken. Findley found that the dolomitic middle Bakken member in Montana had oil shows and porosity in sample cuttings, as well as porosity on well logs. Also, the porous middle Bakken member could be ...
Cat Creek Oil Field reached its peak of production in 1922, with 11 wells drilling 3 million barrels of oil. [1] In the 1930s, the Continental Oil Company (CONOCO) had assumed control of the oil fields, and the industry thrived in the 1940s in particular once again. [1] A pilot water-flood project occurred at West dome in 1957.
The rocks serve as an important aquifer as well as an oil reservoir in places. The Madison and its equivalent strata extend from the Black Hills of western South Dakota to western Montana and eastern Idaho , and from the Canada–United States border to western Colorado and the Grand Canyon of Arizona .
Well logging, also known as borehole logging is the practice of making a detailed record (a well log) of the geologic formations penetrated by a borehole.The log may be based either on visual inspection of samples brought to the surface (geological logs) or on physical measurements made by instruments lowered into the hole (geophysical logs).
The Williston Basin is a large intracratonic sedimentary basin in eastern Montana, western North Dakota, South Dakota, southern Saskatchewan, and south-western Manitoba that is known for its rich deposits of petroleum and potash. The basin is a geologic structural basin but not a topographic depression; it is transected by the Missouri River ...
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Initial exploration of the region occurred in the 1860s with extensive workings developed at the Homestake and Little Daisy Mines between 1904 and 1925. The Homestake mine stopped only a few hundred feet from a high-grade ore body later discovered by Crown Butte Mines (a subsidiary of Hemlo Gold, a Canadian mining company) in 1989-1990 as a result of an intensive drilling campaign.