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沁水盆地南部煤储层参数及其对煤层气井产能的控制
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摘要
论文以沁水盆地南部煤层气开发为依托,运用煤田地质、石油天然气地质和水文地质等多学科理论和方法,系统研究了厚度、含气量、渗透性、解吸特征、地质构造、地应力条件、水文条件等煤储层参数,建立了煤层气井产能与这些参数之间的相关关系和模型。通过等温吸附解吸实验,揭示了煤层在解吸过程中存在的“解吸滞后”现象,在变压吸附曲线中,解吸曲线位于吸附曲线上方,解吸初期,解吸曲线的斜率小于吸附曲线的斜率,使得实际煤层气井的产能比采用吸附曲线预计的偏低。同时研究了煤层渗透性随埋深和地应力变化的定量关系,总结出沁水盆地南部煤层渗透率随地应力增大呈指数降低的规律。论文还认为煤层的贮水性、原始水头和顶底板岩性等水文地质参数影响到煤层气井的产能。研究成果对煤层气开发具有重要的指导意义。
Based on coalbed methane exploitation in the Southern Qinshui Basin, used multidisciplinary theories and approaches in the fields of coal geology, oil & gas geology and hydrologic geology, researched systematically on coal reservoir parameters, such as coal reservoir thickness, gas content, permeability, desorption characteristics, geological structures, in-situ stress conditions and hydrology conditions, the correlativity and model have been established between coalbed methane wells' productivity and those parameters in this dissertation. The isothermal adsorption and desorption experiment revealed that coal seam has desorption hysteresis in the process of desorption. In the pressure swing adsorption curve, the desorption curve is up from the adsorption one. Initial phase of desorption, desorption curve slope is less than adsorption's, therefore, the real coalbed methane wells' productivity is below the one expected from adsorption curve. The quantification relationship between coal reservoir parameters and in-situ stress following the burial depth has also been discussed in this dissertation. The law which coal reservoir permeability decreases exponentially with the increase of burial depth is summarized. In the dissertation, coalbed methane wells' productivity is affected by hydrogeology parameters like water reserve of coal seam, original water pressure or mine roof and base lithology. The research result has important directive significance to coalbed methane exploitation.
引文
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