Comparison of coalbed gas generation between Huaibei-Huainan coalfields and Qinshui coal basin based on the tectono-thermal modeling
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- 作者：YuDong Wu (1)
YiWen Ju (1)
QuanLin Hou (1)
ShengBiao Hu (2)
JieNan Pan (1) (3)
JunJia Fan (1) - 关键词：HuaiBei coalfield ; Huainan coalfield ; Qinshui coal basin ; tectono ; thermal modeling ; coalbed gas generation
- 刊名：Science China Earth Sciences
- 出版年：2011
- 出版时间：July 2011
- 年：2011
- 卷：54
- 期：7
- 页码：1069-1077
- 全文大小：822KB
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YiWen Ju (1)
QuanLin Hou (1)
ShengBiao Hu (2)
JieNan Pan (1) (3)
JunJia Fan (1)
1. College of Earth Science, Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
3. Institute of Resources & Environment, Henan Polytechnic University, Henan, 454000, China - ISSN：1869-1897
文摘
The geothermal history and the tectonic subsidence history of the Huaibei-Huainan coalfields were reconstructed by using the vitrinite reflectance data, and their correlative restriction on coalbed gas generation of Huaibei-Huainan coalfields and Qinshui coal basin was discussed. The burial, thermal, and maturity histories of are similar between Huaibei coalfield and Huainan coalfield, obviously different from those of Qinshui coal basin. Based on the tectono-thermal evolution characters of Huaibei-Huainan coalfields and Qinshui basin, the process of coalbed gas generation can be divided into three stages: (1) During Early Mesozoic, both in Huaibei-Huainan and Qinshui, the buried depth of Permian coal seams increased rapidly, which resulted in strong metamorphism and high burial temperature of coal seams. At this stage, the coal rank was mainly fat coal, and locally reached coking coal. These created an environment favoring the generation of thermogenic gas. (2) From Late Jurassic to Cretaceous, in the areas of Huaibei-Huainan, the strata suffered from erosion and the crust became thinning, and the Permian coal-bearing strata were uplifted to surface. At this stage, the thermogenic gas mostly escaped. Conversely, in Qinshui basin, the cover strata of coal seams kept intact during this stage, and the thermogenic gas were mostly preserved. Furthermore, with the interaction of magmatism, the burial temperature of coal seams reached higher peak value, and it was suitable for the secondary generation of thermogenic gas. (3) From Paleogene onward, in area of Huainan-Huaibei, the maturity of coal and burial temperature were propitious to the generation of secondary biogenic gases. However, in Qinshui basin, the maturity of coal went against genesis of second biogenic gas or thermogenic gas. By comparison, Huaibei-Huainan coalfields are dominated by thermogenic gas with a significant biogenic gas and hydrodynamic overprint, whereas Qinshui basin is dominated mainly by thermogenic gas.