Geochemical Characteristics of Gas Source Rock and Generation-Evolution Model ofBiogenic Gas in Hetao Basin
Received date: 2007-11-12
Revised date: 2008-02-19
Online published: 2008-04-10
The analysis of natural gas composition and carbon isotopes of methane confirms the existence of biogenic gas around the Tertiary Pliocene series and the Quaternary Pleistocene series in the Hetao basin. Detailed organic geochemistrcal data shows that the biogenic gas source rock of the middle and upper Pleistocene series in this area contains a high content of organic matters and typesⅡ2 and Ⅲ kerogens. The organic matter in the biogenic gas source rock is in low-mature stage, which is benefit for the formation of biogas. In addition, this article establishes a generation-evolution model of biogas, taking into account the region geology feature and temperature affection on the biogas generation, and puts forward that the best vertical extent for biogenic gas formation in the Hetao basin is in the middle of the Quaternary Pleistocene series, between 685 meters and 926 meters.
Key words： Biogenic gas; Geochemical characteristics; Evolution model; Hetao basin.
KONG Qing-fen;LI Jian-feng; LI Min-cai; WU Kai; SUN Lin
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