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The Brooks Ranch field is a stratigraphic-type oil field in T. 33 N., R. 77 W., Natrona and Converse counties, Wyoming. Field production is from the Upper Cretaceous Second Frontier sandstone. The sandstone thins eastward to a wedge-edge from a gross thickness of 25 feet at the western margin of the field. The oil accumulation is controlled by an anticlinal axis which intersects the stratigraphic thinning. The productive area of the field will exceed 3,000 acres.
The average permeability of 5 millidarcys is low, whereas the porosity ranges between 18 and 20 per cent. Initial production varies considerably from well to well, averaging about 100 barrels of oil per day per well. The discovery well drilled by Dan C. Morton in March, 1957, is located in the SE., SE., SE., Sec. 9. The field now has 50 producing wells.
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