页岩气藏等效高渗透带的建立和优化研究

Study on establishment and optimization of equivalent high permeability zone in shale gas reservoir

针对在页岩气藏压裂形成的网状裂缝系统后的复杂的渗流问题,采用油藏数值模拟和等效高渗带建立的方法,在综合考虑累积产气量、采出程度等指标情况下。进行了页岩气藏的等效高深带建立和优化研究,研究得出:该区块高渗透带条数为15条、交叉分布裂缝两端小中间大、高渗透带渗透率为6 m D,高渗透带的半长为250 m时为最佳情况,该研究为页岩气藏水平井压裂提供了重要的理论依据。

Aiming at the complicated seepage problems in fracture network formation of shale gas reservoir fracturing,using reservoir numerical simulation and equivalent permeability zone established method,considering the cumulative gas production and recovery degree index case,the equivalent high-depth zone establishment and optimization of shale gas reservoirs were carried out. The study shows that：there are 15 equivalent high permeability zone in this block,cross distribution of fracture which is small at both ends and big in middle,permeability of equivalent high permeability zone is 6 m D,high permeability zone and the half length of 250 m at the best situation. This study provides an important theoretical basis for horizontal well fracturing in shale gas reservoirs.