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In page Shale gas:
"Some of the gas produced is held in natural fractures, some in pore spaces,[1] and some is adsorbed onto the shale matrix. Further, the adsorption of gas is a process of physisorption, exothermic and spontaneous.[4] The gas in the fractures is produced immediately; the gas adsorbed onto organic material is released as the formation pressure is drawn down by the well.[citation needed]
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