| Summary: | The Shattuck Member of the Queen Formation (Permian) is an extensive reservoir that covers over 10,000 km2 along the Northwest Shelf of southeast New Mexico. It consists partly of quartz sandstone with anhydrite and dolomite cements. The Shattuck Member is one of a number of sandstone packages that makes up the Upper Permian Guadalupian Series of West Texas, consisting of the San Andres, Grayburg, Queen, Seven Rivers, Yates and Tansill Formations. In the study area near Maljamar Field, gamma ray cut-offs from electric logs show where the mineralogy changes and the quartz-rich facies dominates versus the dolomite-rich interval within the Shattuck member. The quartz-rich facies is the best target for producing oil/gas from the Shattuck Member. Isopach mapping, core analysis, X-ray diffraction data, and a revised depositional model indicate that the best reservoir quality will be located north and south of the Artesia Vacuum structure.
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