Print this pageAbstract: Entrada Oil Fields of Southern San Juan Basin, New Mexico
Twenty-two years elapsed between the discovery of the first Entrada (Jurassic) oil field at Media, Sandoval County (T19N, R3W), in 1953 and the discovery of Eagle Mesa, Sandoval County (T19N, R4W), in 1975. In the last 2 years, four additional pools have been found at Ojo Encino, McKinley County (T20N, R5W); Papers Wash, McKinley County (T19N, R5W); Snake Eyes, San Juan County (T21N, R8W); and Leggs, San Juan County (T21N, R10W). These recent successes resulted from regional geologic studies, reevaluation of the Media field, and use of high-resolution seismic techniques and processing. Oil is trapped in Entrada eolian sand dunes that have been preserved by the overlying lacustrine limestone and anhydrite of the Todilto Formation. Hydrodynamic influences have tilted the oi -water contacts in some of the fields. The oil, which is believed to have been generated within the Todilto limestones, is of medium gravity and high pour point.
AAPG Search and Discovery Article #90964©1978 AAPG Rocky Mountain Section Meeting, Salt Lake City, Utah