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Abnormal Pressures and Their Relation to Oil and Gas Migration and Accumulation: ABSTRACT Free
Effects of Arkosic Sandstone Diagenesis on Reservoir Rock Properties: ABSTRACT Free
Deepwater Evaporites in The Bell Canyon Formation, Delaware Basin, West Texas Available to Purchase
Abstract Thin beds of sandy, anhydritic dolomite are present in the dominantly sandy Bell Canyon Formation. Since Adams’ (1936) work, the Delaware Mountain Group has been known to be basinal in origin. Recently, Bell Canyon sandstones have been considered to represent several different processes of transportation. Various mechanisms of sedimentation notwithstanding, the Bell Canyon dolomites occur in a basinal stratigraphic setting. They contain texturally graded sands, they occur in repetitive bedsets, and they are biologically depauperate. The dolomite consists of two distinct categories: 1) murky-brown, anhedral, subequant groundmass crystals and 2) limpid, euhedral pore filling crystals. The anhedral, murky dolomite occurs as grains about 0.02 mm in diameter, which do not vary in size even though the included clastic fractions are graded. The limpid crystals occur only in permeability avenues in the groundmass, in burrows or as replacements in skeletal voids. Anhydrite is present as nodules, pore-fillings and as groundmass replacements. The nodules do not exhibit fabric-penetrating crystal growth as do the pore-filling and replacement varieties, suggesting that the nodules had an early, depositional origin as gypsum spherulites. The anhedral dolomite and the anhydrite nodules are interpreted to be early (sediment-water interface) diagenetic products which replaced gypsiferous calcilutite or calcisiltite in the deep, hypersaline stratified Delaware Basin at Bell Canyon time. The limpid dolomite, pore-filling and replacement anhydrite are interpreted to be products of early burial diagenesis. The pre-dolomitization Bell Canyon carbonates are interpreted to have been part of a cyclical-reciprocal system of sedimentation in which clastics and carbonates alternately dominated the shelf depending on variations in climate and supply of clastics. The virgin carbonates were probably soft, peloidal, gypsiferous, aragonitic muds that were entrained in density flows off the shallow Permian shelf.