中文摘要：

缝网压裂是致密油藏开发的重要技术手段.考虑致密油藏压裂缝网系统中基质、天然裂缝、压裂裂缝具有的显著多尺度特征,将致密油藏视为由均匀各向同性基质系统和裂缝系统组成且为同一空间中复合的两个彼此独立又相互联系的水动力场,分别针对裂缝系统和基质系统建立达西渗流数学模型,采用局部网格加密和等效渗流原则求得数值解,实现了致密油藏正交裂缝网络模式下的缝网压裂生产模拟.缝网压裂与常规双翼缝压裂动态对比表明：压裂后二者累计产量虽均随储层基质渗透率、人工裂缝长度增加而增加,但缝网压裂的增产效果更显著;致密油藏缝网压裂能极大地提高单井产量.研究方法为优化压裂裂缝参数提供了手段。

英文摘要：

Network fracturing is one of the important technical means aimed at the development of tight oil reservoirs. Considering the significant multi-scale characteristics of matrix, natural fractures, fractured cracks of the frac- ture network system in the reservoirs, the tight oil reservoirs regarded as the complex between the homogeneous iso- tropic matrix system and fracture system and moreover two combined hydrodynamic fields that are independent and connected each other in the same space. The mathematical models of the matrix and fracture systems are set up for the Darcy seepage and the numerical solutions are obtained with EQ-LGR method. Thus the production simulation of the network fracturing is implemented under the orthogonal fracture network model. The contrast with the perform- ances of the conventional fracturing with double-wing cracks shows that the cumulative production of the two fracturings increases with the rises of the reservoir matrix permeability and fractured crack length, but the stimulated effects of the network fracturing are more significant; the network fracturing can greatly improve the single well production. The researching methods have provided the means for optimizing the fracture parameters.