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By Peter Auer (Eds.)

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More recently, reservoir simulation studies have argued that all of the produced gas could be accounted for by the free gas in the natural fracture system (Holditch, 1978). Because of different interpretations as to the dominant source of the produced gas, widely varying resource estimates have been used for the Devonian shales, as summarized in Table XVIII. Gas has been produced from the Devonian shales, particularly from formations in northern Ohio (Lake Erie District) and from eastern Kentucky (Big Sandy Field) since the late nineteenth century.

09. Fracture perpendicular to lens; effective fracture length is 200 ft. Unconventional Natural Gas 43 (iii) H o w many lenses, including those not encountered at the wellbore, can a fracture of specified length be expected to penetrate? Each of these assumptions was based on analysis of the available data, as described in what follows. 3. Key Technical Adaptations a. Adjustment for Effective Fracture Length. The simulations of Well N o . 212 showed a strong relationship between production and the orientation of the fracture relative to the lens.

Recovery of gas from unminable coal seams requires that the wellbore be in communication with the total natural fracture system in the well drainage area. Using vertical wellbores with stimulated fractures does not appear to be a technically viable option except in unique settings. The induced fracture will tend to parallel the face cleats rather than intersect them, providing only limited connection with the natural fracture system. Deviated wells appear to provide a technically feasible means for exploiting the deeply buried, unminable coal (Fig.

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