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The methane migration and storage characteristics of the Pittsburgh, Pocahontas No. 3, and Oklahoma Hartshorne coalbeds
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    "Methane flows and pressures were measured in mines in the Pittsburgh, Hartshorne, and Pocahontas No. 3 coalbeds. From the data, the permeability of each of these coalbeds was computed. It was found to depend strongly on the type of coal and on the amount of water in the coalbed, and it was found to increase with time. All of the coalbeds had a high-permeability zone adjacent to the face or rib, and the Pittsburgh bed exhibited directional anisotropy. Surprisingly, little or no overburden effect was observed." - NIOSHTIC-2 NIOSHTIC no. 10000613
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