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The key stage and moment of coalbed gas reservior evolution In the Qinshui Basin, China

机译：沁水盆地煤层气储层演化的关键阶段和关键时刻

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摘要

The evolution of coalbed gas reservoir is characterized by coalbed gas geochemistry and gas content. On the basis of burial history and thermal history, the forming process of coalbed gas reservoir and the gas accumulative history in the Qinshui Basin are discussed in this paper. The difference of the thermal history, geochemistry characteristic, and gas accumulative history between Yangcheng and Huozhou areas shows that the formation of coalbed gas reservoir in the Qinshui Basin is controlled by the geological process in the critical stage and the critical moment. The components and isotopes of coalbed methane are determined by the stage at which the coal maturation reaches its maximum rank. The coalbed methane accumulative history is related to the temperature and pressure of the coal burial history, because the coalbed gas is mainly in adsorptive state. It is stated that the gas content in the coal seam is controlled by the moment when the coal seam is uplifted to the shallowest position.
机译：煤层气储集层的演化以煤层气地球化学特征和含气量为特征。根据埋藏史和热史，探讨了沁水盆地煤层气藏的形成过程和天然气成藏史。羊城地区和霍州地区的热史，地球化学特征和天然气成藏史的差异表明，沁水盆地煤层气藏的形成受关键时期和关键时刻的地质过程控制。煤层气的组成和同位素由煤成熟度达到其最大等级的阶段确定。由于煤层气主要处于吸附状态，因此煤层气的累积历史与埋葬历史的温度和压力有关。据指出，煤层中的瓦斯含量是由煤层抬升到最浅位置的时刻来控制的。

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