Abstract

In March, 1989, Marshall & Winston, Inc. drilled the No. 1 McMurtrey in Concho County, Texas. This well was drilled on the basis of a combination geochemical and subsurface anomaly mapped on the King Sand. The King Sand was encountered at a depth of 2,072 feet and was completed for 79 BOPD with no produced water. The No. 1 McMurtrey became the first well in the Lonesome Dove II Field. Subsequent wells were drilled to the King Sand and dipmeters were run to define the orientation of the sand body. In addition to the dipmeter interpretations, subsurface data were mapped to extend the boundaries of the field beyond the original geochemical and isopach maps. The reservoir characteristics of the King Sand were defined from conventional cores, sidewall cores, and wireline logs. As of August 1, 1991, forty-six wells have been drilled in the field by three operators. Forty of these wells are oil producing with a monthly production for the field in excess of 100,000 BOPM. Recently, several wells have been drilled to the Goen limestone which is also oil productive. Needless to say, the discovery of the Lonesome Dove II field has led to increased interest in the area for further exploration.