Mathematical models for predicting gas performance of Devonian gas shale reservoirs can be divided into two groups: single and dual porosity models. Further, two dual porosity models have been developed. Although the shale matrix is known to contain a large quantity of gas, it is not known what fraction can be produced economically. No conclusive evidence in support of the various model concepts is given, but the information in this paper will facilitate comparison of existing models. Area requiring further study in order to advance current modeling technology are discussed.

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