Fractures play a very important role in the improvement of low-permeability clastic reservoir properties. A research of the fracture patterns and controlling factors has a direct effect on the planning of the development program and reservoir development. On the basis of basin analysis and reservoir studies, both the relationship between fracture of the Kc Formation and regional tectonic stress cracks, and the relationship between sedimentary facies and lithology are studied through sequence stratigraphy and geological statistical analysis. The research findings reveal that there are NE and NW direction stresses that influence fracture in the work area, which form high-angle fractures of NE direction. Different facies and lithology also affect fracture development. Fractures in middle fan and fringe fan facies are more developed than those in root fan, and fractures in sandstone are more developed than those in conglomerate. On the basis of geological understanding, fracture network model is established.%裂缝对改善低渗透碎屑岩储层物性有非常重要的作用,裂缝发育规律和控制因素的研究直接影响着开发方案部署和油藏开发效果.在盆地分析和储层研究基础上,利用层序地层和地质统计学方法,分析了Kc组裂缝与区域构造应力、沉积相和岩性的关系.受区域压扭作用影响,区域上发育北东和北西方向两组影响裂缝的地应力,形成了以北东方向为主的高角度裂缝.不同沉积相带和不同岩性储层裂缝发育也有差异,扇中和扇缘亚相裂缝较扇根亚相发育、砂岩较砾岩裂缝发育.在这种地质认识基础上,建立了裂缝三维地质模型.
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