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Geothermal field and its relation with coalbed methane distribution of the Qinshui Basin

机译：沁水盆地地热场及其与煤层气分布的关系

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摘要

The average geothermal gradient in the Qinshui Basin, Shanxi Province, North China, estimated from temperature logging data of 20 boreholes is 28.2.03/km. The thermal conductivities of 39 rock samples are measured and 20 heat flow values are obtained. The estimated heat flow ranges from 44.75 mW/m2 to 101.81 mW/m2, with a mean of 62.695.20 mW/m2. The thermal history reconstruction from the inversion of vitrinite data, using Ther-model for Windows 2004, reveals that the average paleo-heat flow at the time of maximum burial in late Jurassic to early Cretaceous is 158.41 mW/m2 for the north part, 119.57 mW/m2 for the central part and 169.43 mW/m2 for the south part of the basin respectively. The reconstruction of the buried history of the strata indicates that the age for the end of sedimentation and the beginning of erosion for the basin is 10856 Ma, and that the eroded thickness of the strata is 2603 m in the north, 2291 m in the central, and 2528.9 m in the south of the basin respectively. The higher in the north and the south, lower in the central distribution pattern of the paleo-heat flow coincides with the distribution of the coal-bed methane spatially and temporally, which shows that the coal-bed methane is controlled by the paleo-geotem-perature field in the basin.
机译：根据20个井眼的温度测井数据估算，华北山西沁水盆地的平均地热梯度为28.2.03 / km。测量了39个岩石样品的热导率，并获得20个热流值。估计的热流范围从44.75 mW / m2到101.81 mW / m2，平均为62.695.20 mW / m2。使用Windows 2004的Ther模型从镜质数据的反演中得到的热历史重建表明，北部侏罗纪至白垩纪早期最大埋藏时平均古热流量为158.41 mW / m2，北部为119.57。流域中部的mW / m2和南部的部分分别为169.43 mW / m2。地层埋藏历史的重建表明该盆地沉积结束和侵蚀开始的年龄为10856 Ma，北部的侵蚀厚度为2603 m，中部为2291 m盆地南部分别为2528.9 m。北部和南部越高，古热流的中央分布格局越低，与煤层气的时空分布相吻合，表明煤层气受古大地构造控制。盆地中的热田。

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