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Thick, aggradational sequences of shelf and distal shoreface sandstones are prolific hydrocarbon reservoirs in the deep, downdip part of the Frio Formation fronting the Greta/Carancahua shorezone system. Near Corpus Christi, Texas, geopressured shelf reservoirs have produced more than 190 bcf of gas just in the Corpus Channel and Encinal Channel fields; within these fields, two thinly bedded shelf-sandstone units (K2 and K8 reservoirs) have produced 26 and 38 bcf of gas respectively.

Cross sections and maps show that shelf sandstones extend basinward from the distal shoreface toes of barrier-island and beach-ridge sandstone bodies. Shelf sequences are typically upward-coarsening, although...

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