Evaluation of production data in Southwestern West Virginia had identified five Devonian shale well type categories and average reservoir properties associated with each category. Permeabilitythickness product can be uniquely identified from history matching regardless of the variability of other match parameters. Pressure buildup analyses conducted on three wells confirms this. A simple relationship exists between the permeabilitythickness product and ten-year cumulative production. History match data suggest that natural fracture property variations result in well quality variations.

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