Dolomitization Model for the Forereef Facies of the Permian Capitan Formation, Guadalupe Mountains, Texas-New Mexico
Published:January 01, 1989
Leslie A. Melim, Peter A. Scholle, 1989. "Dolomitization Model for the Forereef Facies of the Permian Capitan Formation, Guadalupe Mountains, Texas-New Mexico", Subsurface and Outcrop Examination of the Capitan Shelf Margin, Northern Delaware Basin, Paul M. Harris, George A. Grover
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The Capitan Formation includes the massive "reef" and the bedded forereef slope facies of the Permian Reef Complex (Fig. 1). The ongoing controversy over the nature of the reef has not substantially affected interpretation of the bedded forereef slope portion of the Capitan. Whether the "reef" was a major wave-resistant barrier or not, it shed massive volumes of debris into the 600 m deep Delaware Basin allowing as much as 7 km of lateral progradation during Late Guadalupian time. The forereef talus facies contains allochthonous fragments of both reef and near-back-reef material; much of this detritus dips steeply into the basin (with primary dips of up to 35°) and interfingers at the base of the slope with siltstones of the Bell Canyon Formation. Material was transported downslope by rockfall, debris flow, turbidity current, and other processes, yielding complex large- and small-scale fabrics. In general, sorting is poor and individual beds thin rapidly and get finer-grained in a basinward direction. Locally, small channels filled with sand- to silt-sized siliciclastic material cut through the carbonate strata. These slope channels (carbonate and noncarbonate) and variably sorted sediment packages exerted a strong influence on the early hydrology of the forereef zone.
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Subsurface and Outcrop Examination of the Capitan Shelf Margin, Northern Delaware Basin
Shelf sandstone reservoirs are becoming a more and more common exploration target. What they are, how they may be characterized, and how they differ from shoreline and deep-water deposits in the subject of this publication. Shelf sands and sandstone reservoirs are among the more poorly understood types of sandstones. Continental, shoreline and deep water sandstones have all been studied in much more depth than have shelf sands and sandstones. However, during the last fifteen years significant progress has been made in understanding shelf sands and sandstones. Studies of modern sediments have allowed us to understand many of the depositional processes active on the shelf. This book is intended to be an up-to-date summary of shelf processes and products. The papers are intended for those new to shelf sands and sandstones as well as the shelf specialist.