The History Analysis of Hydrocarbon Expulsion from the Coal Beds in the Carbon iferous-Perm ian in Qinshui Basin, Shanxi

LI Wei; ZHANG Zhi-huan; ZHU Lei; HAN Li-guo; YANG Yong-cai

Through the synthetically study on the homogenization temperature and occurrence in the authigenic minerals of fluid inclusions in the terrane between or above the coal beds in the Carboniferous-Permain in the Qinshui basin, Shanxi, three stages of expulsion of hydrocarbon from the coal bedswere known. Combiningwith the conclusion of basin evolution, it is deduced that the filling of hydrocarbon happened during J₂, the early of K₁ and K₂ ～E₁. In the early stage, coal beds produced coal-generating oil. The stages of expulsion of nature gas are corresponding with the phase of thermocatalysis and thermal cracking, respectively. So the coal-bed gas in the Qinshui basin is mostly composed of gas of thermocatalysis and thermal cracking. The extracted hydrocarbon residues of the coal and the sand-stones are app reciably different, because of difference of fractional distillation and the filling of different degrees of hydrocarbon in the coal beds and the sandstones.

The History Analysis of Hydrocarbon Expulsion from the Coal Beds in the Carbon iferous-Perm ian in Qinshui Basin, Shanxi

Key Laboratory for Hydrocarbon Accumulation, Ministry of Education, Faculty of Natural Resources & Information Technology, University of Petroleum, Beijing 102249

Received Date: 2004-06-27

Rev Recd Date: 2004-11-08

Publish Date: 2005-06-10

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Abstract: Through the synthetically study on the homogenization temperature and occurrence in the authigenic minerals of fluid inclusions in the terrane between or above the coal beds in the Carboniferous-Permain in the Qinshui basin, Shanxi, three stages of expulsion of hydrocarbon from the coal bedswere known. Combiningwith the conclusion of basin evolution, it is deduced that the filling of hydrocarbon happened during J₂, the early of K₁ and K₂ ～E₁. In the early stage, coal beds produced coal-generating oil. The stages of expulsion of nature gas are corresponding with the phase of thermocatalysis and thermal cracking, respectively. So the coal-bed gas in the Qinshui basin is mostly composed of gas of thermocatalysis and thermal cracking. The extracted hydrocarbon residues of the coal and the sand-stones are app reciably different, because of difference of fractional distillation and the filling of different degrees of hydrocarbon in the coal beds and the sandstones.

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The History Analysis of Hydrocarbon Expulsion from the Coal Beds in the Carbon iferous-Perm ian in Qinshui Basin, Shanxi

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