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World class hydrocarbon accumulations occur in many ancient evaporite-related marine and lacustrine basins.
The first basinwide study of Residual Oil Zones (ROZ’s) in the upper Guadalupian carbonates of the Permian Basin, supported by the Research Partnership to Secure Energy for America (RPSEA), has been initiated. Production from ROZ’s and anecdotal evidence from exploration wells, coupled with the theory/model of the development of ROZ’s, has led to the belief that there are potentially billions of barrels of additional producible tertiary reserves in the Permian Basin and elsewhere.
A significant minority of sinkholes formed in gypsum bedrock in the Delaware Basin of west Texas and southeastern New Mexico are of human origin.
Continental trace fossils are useful in both outcrop and core for differentiating between alluvial, lacustrine, and eolian paleoenvironments as well as from marine paleoenvironments.
As exploration and production in shale-gas plays reach a more mature stage, it is clear that the conventional questions about trap, seal, stratigraphy, depositional facies and geometries, and their relationship to reservoir properties, need to be answered in regards to these unconventional reservoirs.
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