Discoveries--Glenrock Area--Converse County, Wyoming: ABSTRACT

Abstract

Five wells constitute the discoveries of the Glenrock area, located on the south rim of the Powder River Basin, Converse County, Wyoming. Production is obtained from sands in the Cretaceous Muddy and Dakota horizons on three separate structural features. The Glenrock field proper is a faulted (?) block east of, and associated with, the large Big Muddy uplift. South Glenrock is producing from a structural nose extending eastward from the east end of Big Muddy. The Deer Creek field is a separate feature south of a sharp syncline separating it from Big Muddy, being less than two miles from the north front of the northern Laramie Mountains. Production varies from approximately 7,200 feet at Glenrock through the depths 5,800-5,900 feet at South Glenrock to 5,100 feet at Deer C eek. The discovery well for the entire Glenrock area was the Steelco McDonald No. 1, completed December 27, 1949, from the Muddy sand. Slides showing a map of the region and its relationship to the Bid Muddy oil field, which was discovered in 1916, and a cross section correlating the discovery wells point to the key geologic features. Kodachrome slides of operations and cores illustrate the developments of the area. End_of_Article - Last_Page 1104------------