Updated geologic maps provide greater detail for Marcellus formation

Natural gas production from the Marcellus shale formation in the Appalachian basin increased to 14.4 Bcf/d in January 2015, accounting for more than 36% of shale gas production and more than 18% of total dry natural gas production in the United States. Recent updates to EIA’s maps and geologic information for the Marcellus shale play help to characterize the formation’s structure, thickness, and extent.

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