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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 69 (1985)

Issue: 9. (September)

First Page: 1437

Last Page: 1437

Title: Applications of Surface Geochemical Prospecting for Shale Gas Exploration in Western Appalachian Basin: ABSTRACT

Author(s): Darioush T. Ghahremani, Philip O. Banks

Article Type: Meeting abstract


Results of a regional radiometric survey in northeastern Ohio revealed several sites where anomalous values of radon, hydrocarbons, and associated gases were found. Laboratory analysis of Previous HitsoilNext Hit-gas samples and comparisons between radon activities at anomalous sites and scintillometer readings at the same sites indicate that the anomalous gas components are of bedrock origin.

Deeper Previous HitsoilNext Hit-gas hydrocarbon sampling techniques and various film cups and electronic detectors were used to interpret the significance of radon-hydrocarbon relationship. Highly sensitive FID and TCD gas chromatographs were used to separate and measure Previous HitsoilNext Hit-gas light hydrocarbons (C1-C4) and associated gases.

Results were consistent with earlier anomalous values for total hydrocarbons C2/C1, and C2/C3 ratios in areas of higher radon activities, supporting the hypothesis of gases leaking from depth. Gas components considered to be particularly significant in this regard are the light (C2-C4) hydrocarbons, He, H2, H2S, and CO2, because the presence of high CH4 may partly result from microbial or chemical reactions in the Previous HitsoilNext Hit or subsurface bed rock. Deeper Previous HitsoilNext Hit-gas hydrocarbon compositions, as measured by ratios of C1/C2, C1/Cn, and C3/C1 × 1,000, were found to be more consistent with known samples of Devonian sha e gas than with Clinton or other gases in Ohio. This compositional relationship offers support for the viability of radon/hydrocarbon Previous HitsoilNext Hit-gas prospecting. Recent blowouts in eastern Ohio where Previous HitsoilTop-gas anomalies were discovered prior to actual drillings also support this conclusion.

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