低渗致密砂岩气藏主要采用多段压裂水平井进行开发,其开发效果受裂缝参数影响显著.针对川西地区窄河道砂岩气藏河道类型多样、非均质性强的特点,采用数值模拟方法,对典型河道中水平井的裂缝间距、裂缝长度、导流能力进行优化,并综合分析了影响最优裂缝参数的地质因素.结果表明,最优裂缝间距与储层有效渗透率成正比,河道渗透率越高,裂缝间距越大;最优缝长主要由河道宽度及有效渗透率决定,宽度越宽、渗透率越低的河道最优裂缝越长;裂缝导流能力则受储量丰度及有效渗透率综合影响.根据最优裂缝参数影响因素分析结果,建立了河道地质特征参数与最优裂缝参数间的数学关系式,可用于快速预测不同河道相应的最优裂缝参数.%Multi-fractured horizontal wells are widely used in low permeability and tight sandstone gas reservoirs, so the fracture parameters have significant impact on the develop-ment effeciency of it. Based on the characteristics of diversified channel and strong hetero-geneity of resevre, simulation method was introduced to optimize the space, length as well as conductivity of hydraulic fracture for horizontal wells in tipycal channels. And the geological factors influencing suitable fracture parameters were also analyzed. Result shows that the op-timal fracture space is proportional to effective permeability, which means the higher perme-ablity of channel, the larger space between fractures. And the suitable length of fracture is mainly determined by both the width of channel and ecffective permeability. In the wider channel with lower permeability, the horizontal well with longer fractures will have a higher production. Moreover, both the abundance and effective permeablity of reserve have an effect on the optimal conductivity of fracture. According to the analyzing result of factors influenc-ing optimal fracture parameters, the mathmatical relations between geological parameters and optimized fracture parameters are established which can be used to predict suitable fracture parameters of horizontal wells in differenet channels quickly.
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