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Title: Geochemistry And Origin Of Natural Gas
Author: James G. Palacas
Source: American Gas Association 1971
Year Published: 1971
Abstract: Natural gas is composed of lowmolecuiar- weight paraffin hydrocarbons, chiefly methane, and variable but generally small amounts, of Ns, CO, H.S, and He. Gas pools are distributed widely in subsurface rocks throughout the world, mainly in sandstone and carbonate reservoir rocks that range in age from Pleistocene to Cambrian. No one theory explains the origin of ail natural gas deposits. The most widely recognized source of hydrocarbon gases is decomposing organic matter in sediment derived from plants and animals the gases are produced by bacterial decay, thermal disintegration of solid carbonaceous substances at depth and natural cracking of disseminated or pooled crude oil. Substantial evidence such as isotope analyses supports an inorganic source for some large nonassociated natural gas deposits consisting mainly of methane and carbon dioxide. But many gas deposits probably represent multiple sources, variable chemical processes and complex migration and concentration mechanisms. Whereas most of the natural gas deposits have been and will continue to be located by traditional geologic exploration, development of new concepts on other sources of gas, such as gas-hydrates in the permafrost regions of the world and gases generated by high-temperature igneous activity in areas heretofore considered unfavorable, might yield additional large gas resources.

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