中文摘要：

针对致密油非线性渗流特征和储层压敏特性，建立了致密油储层体积压裂非线性渗流模型，基于树状分叉分形理论表征体积压裂复杂裂缝形态，根据致密油在体积压裂改造区内不同流动形态，划分为3个区域，推导出了致密油层体积压裂直井三区耦合产能公式，分析了变形系数、分形维数、压敏效应、改造区大小、裂缝导流能力等参数对直井产能的影响．研究结果表明：体积压裂直井产能与变形系数呈非线性递减关系，且生产压差越大，产能下降越多，下降幅度达到70％；体积压裂形成的裂缝条数越多，体积改造区等效渗透率越大；储层压裂改造体积越大，主裂缝越长，直井产能越高；主、次裂缝导流能力越大，直井产能也越高，主裂缝导流能力15～20D·cm，次生缝导流能力在6～10D·cm效果较好．

英文摘要：

Considering nonlinear flow characteristics and pressure sensitive properties of tight oil reservoir, this study established a nonlinear flow mode/ for volume fracturing of a tight oil reservoir, and divided into three areas based on the complicated fracture shapes of tree fractal theory and different flow form of stimulated reservoir volume （SRV） in reformed area. Based on above, this study deduced the coupling productivity equation of three areas vertical well of stimulated reservoir volume. Besides, this study analyzed the influence of deformation coeffi- cient, fractal dimension, stress sensitivity, stimulated reservoir volume, and fracture network conductivity on production capacity. The results show that： productivity decreases nonlinearly with increasing deformation coefficient. The bigger producing pressure drop, the bigger the effect of deformation coefficient on productivity. Increasing number of fractures will improve e- quivalent permeability and productivity. Greater stimulated reservoir volume, and longer pri- mary fracture will lead to higher productivity; with increasing conductivity of primary fractures and secondary fractures, production increases with decreasing increment and approaches a plat- eau, and the optimal conductivity of primary fracture ranges from 15 to 20 D · cm, but second- ary fractures ranges from 6 to 10 D · cm.