Are untapped reserves there for the taking?
Position | Natural Gas - Gas reserves |
While oil is a finite resource--at least in the short term of thousands, rather than hundreds of millions, of years--some of the largest natural gas reserves in the world are biogenic, which means they are being created by microbes today and potentially could be a renewable resource. Biogenic gas deposits are found in sedimentary basins worldwide, including in the mid-continent U.S. and Canada--specifically the Michigan, Illinois, and Appalachian basins and in the West, such as the San Juan Basin in northern New Mexico and the Powder River Basin in Wyoming and Montana.
Understanding how groundwater flow affects microbes that generate methane within oxygen-rich shales and coal beds that are found up to four kilometers underground is the research focus of Jennifer McIntosh, a geochemist in the University of Arizona's Hydrology and Water Resources Department, Tucson. The sedimentary basins she is studying were inland seas during the Paleozoic Age (540-250,000,000 years ago). These seas eventually filled with sedimentary rocks--shales, sandstones, and carbonates--and sank beneath the Earth's surface.
Freshwater was driven into these basin margins during Pleistocene glaciation when pressure from the Laurentide ice sheet drove dilute waters deep underground. This occurred multiple times over a period of approximately 2,000,000 years and as recently as 18,000 years ago when the ice sheet was melting and large amounts of freshwater suddenly became available.
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