Abstract:

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.

Key words: fracture, foreland basin, subaqueous fan, heterogeneity