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应用油气成藏动力学方法,研究沁水盆地南部煤层气成藏动力学机制。通过热力场、应力场、地下水动力场的分析,认为本区具有良好的生烃条件和储集条件,晋城矿区南部,地下水流场为一种汇流区,这种地下水流场特征,导致煤层气在汇流区域得到富集,形成地下水和煤储层中流体的能量的积聚,这种能量的聚集是形成高压储层的基础和保证。同时,南部还是低地应力分布区,渗透率相对地高,因此南部煤层气富集,煤层气产能大,是煤层气勘探开发最有利地区。晋城矿区北部为单向流动的地下水动力场,使得在相同地质背景下的同一地区出现不同的煤层气成藏特征。
Applying hydrocarbon accumulation kinetics to study the kinetic mechanism of coalbed gas accumulation in southern Qinshui Basin. According to the analysis of thermal field, stress field and groundwater field, it is considered that this area has good hydrocarbon generation conditions and reservoir conditions. The south of Jincheng mining area and groundwater flow field are a confluence area. The characteristics of groundwater flow field lead to the formation of coalbed methane The enrichment in the confluence area, the formation of groundwater and coal reservoir fluid energy accumulation, the accumulation of this energy is the basis and guarantee the formation of high pressure reservoirs. At the same time, the southern part is still a low-lying stress distribution area with relatively high permeability. Therefore, enrichment of coalbed methane in the south and large CBM production capacity are the most favorable areas for CBM exploration and development. The groundwater hydrodynamic field flowing in the north of Jincheng mining area is unidirectional, so that different CBM reservoiring characteristics appear in the same area under the same geological background.