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The San Miguel section of the middle Taylor in the
Maverick basin of the Rio Grande embayment is a series of overlapping sand bars striking northeast-southwest. Grain-size plots and core descriptions indicate that these bars developed in a shallow-marine shelf environment. There are as many as five cycles of sand sedimentation, all but one having established production. These sandstones have a cumulative production of over 50,000 bbl of oil since 1948. Over 30,000,000 bbl of oil has been produced from stratigraphic-type fields discovered since 1970. Stratigraphic-type fields have produced over 90% of the total production. Structural traps, caused by differential compaction over volcanic necks, account for the remainder. Torch field, associated with a volcanic neck in Zavala County, and Sacatosa field, a stratigraphic trap in Maverick ounty, are typical. The depth and density of control, as well as the subtle expression of the traps, leave many prospective areas.
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