Mature-basin leftovers

Many of the world’s mature producing regions still contain sizable volumes of potentially recoverable hydrocarbons, although these resources typically are in less conventional types of reservoirs. For instance, a recent report from the Interstate Oil and Gas Compact Commission estimates that the 180,000 sq mile Appalachian and 53,000 sq mile Illinois basins still contain 4.8 billion bbl of oil and 79-96 tcf of gas that can be recovered, primarily from coalbeds, Devonian shales, and low-permeability gas sands, as well as deeper formations.Additionally, the report says regions such as the Appalachian basin of Kentucky may have 3-4 billion bbl of recoverable bitumen resources, and the ...

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