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淮南煤田由次生生物成因和热成因气组成的混合型煤层气藏,受各种地质和水文地质条件的影响和控制。本文通过热流场和地温场、古构造应力场和原地应力场以及地下水动力场的系统分析,探讨了煤层气成藏动力学系统的形成机制,进而提出了相应的成藏地质模型。淮南煤田的煤层气藏虽然属向斜式(或盆心)聚气模型,但是,该模型强调,作为附加气源的次生生物气的补充,成藏动力学系统演化、构造样式和能量场的耦合关系,是混合型煤层气富集成藏的主因。
The mixed coalbed methane reservoirs in Huainan coalfield, which are composed of secondary genesis and thermogenesis gas, are affected and controlled by various geological and hydrogeological conditions. Based on the systematic analysis of the thermal and geothermal field, the paleotemperature and paleotemperature field, the in-situ stress field and the groundwater field, the formation mechanism of the CBM reservoir dynamics system is discussed, and then the corresponding reservoir geological model is proposed. Although the coalbed methane reservoir in the Huainan coalfield is a syncline (or basin) gas accumulation model, this model emphasizes that the supplementation of secondary biogas as an additional source of gas, the evolution of reservoir dynamics, structural style and energy field Of the coupling relationship is the main reason for the mixed CBM enrichment and accumulation.