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《Acta Mineralogica Sinica》 2002-01
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PRELIMINARY STUDY OF TECTONO-THERMAL EVOLUTION CHRACTERISTICS AND COALBED METHANE RESOURCE IN HUAINAN COALFIELD

Li Xiaoming 1,2 Peng Gelin Xi Xianwu(1.Changsha Institute of Geotectonics,Chinese Academy of Sciences,Changsha 410013; 2.Graduate School, Chinese Academy of Sciences, Beijing 100039)  
This paper studies tectono thermal evolution characteristics and coalbed methane resource in the Huainan coalfield by fission track analysis.The results show that:① at least three thermal events have occurred since Late Paleozoic at about 240,140 and 80 Ma, respectively;②paleo geothermal gradient was higher than that at the present.The study estimated that denudation thickness of the area was more than 2000 meters. On the basis of the characteristics of tectono thermal evolution of the Huainan coalfield, the preliminary conclusions will be drawn as follows: the first and second tectono thermal events happened at 240~140 Ma during the Mesozoic, so that most of the coal formed in Late Paleozoic was gradually metamorphosed into gaseous one and a minor amount of it into fat coal. Production of coalbed methane was not too much, and the tectono thermal events in the Late Cretaceous led to the release of coalbed methane into the sky. In general, more gas will release from the regions where structures are better developed than that from the regions lacking structures, which may be suitable for the development of coalbed methane. This method may be applicable to coalbed methane exploration and development.
【Fund】: “九·五”国家重点科技 (攻关 )项目子题 (97 2 2 4 0 1 0 3 0 6)
【CateGory Index】: P618.11
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