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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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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 two years, four additional but similar 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, a reevaluation of the Media field, and the employment 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 infl ences have tilted the oil-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. The geology, drilling, completion, and production of sample fields are discussed.
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