Tin Cup Oil Field
Tin Cup Oil Field is located in San Juan County, approximately southeast of Blanding, Utah. Production is from a northwest–southeast trending carbonate buildup in the Pennsylvanian Upper Ismay. The field is part of the Paradox Basin that extends from the states of Colorado to Utah and New Mexico. The petroleum reservoir is a carbonate phylloid algal lime wackestone to packstone. The fields are mostly algal mounds, with thick sections saturated with oil. Tin Cup Field is approximately long and approximately wide, trending northwest–southeast. Discovery The Field was discovered in 1981 by Marathon Oil Company, with the drilling of the Marathon Oil Co., #1-25 Tin Cup Mesa. Initial shut in pressure was 2,046 psig at 5,500 feet. The initial well was completed in both the Desert Creek and the Ismay Formations. Additional development wells were drilled, and a water flood was initiated during 1985 for pressure maintenance. Currently the field is operated by Mar/Reg Oil Company, an independent oil company based in Nevada. Geology The field is composed of a natural gas cap, oil column and is underlain by an active water zone. Due to low energy prices during the late 1980s additional field development was stopped. The field has cumulative