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Estimates of Natural Gas Resources and Recovery Efficiency Associated with Marcellus Development in West Virginia - Reports of Investigation RI-36

RI-36 is a peer-reviewed study in which more than 270 digital well log suites were evaluated to estimate original gas-in-place (OGIP) for the Marcellus organic-rich shale play in West Virginia. Observed and predicted Marcellus production are taken into account and in-place estimates are calibrated accordingly. The study also examines the Geneseo-Burket and introduces the idea of a Marcellus Reservoir Unit and a separate Geneseo-Burket Reservoir Unit. Marcellus OGIP volumes are higher than those in other recent studies but are reasonable given production and calculated recovery efficiencies.

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*RI-36 Post-Publication Corrections and Modifications


Lithostratigraphy of Middle and Upper Devonian Organic-Rich Shales in West Virginia - Reports of Investigation RI-35

RI-35 is a peer-reviewed study that addresses the distribution and thickness of formally and informally recognized Middle and Upper Devonian rock strata in West Virginia with focus on the Marcellus and other organic-rich shales. Nearly 400 wells were studied, primarily using gamma-ray geophysical well logs, to develop a statewide formalization of the lithostratigraphic nomenclature as described in a report and detailed in a series of cross-sections and isochore maps. All products are available online below. Results from the study may prove useful given continued interest in Appalachian basin hydrocarbon resource development.

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**RI-35 Post-Publication Corrections and Modifications
Page last revised August 16, 2022.
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