Abstract: Rock burst and structural fracture are influenced and controlled mainly by tectonic stress field. On the basis of stress field numerical simulation and rock fracture rules, the fracture parameters of Fu-2 member reservoir of Paleogene in Shigang oilfield are predicted. The study shows that the fractures occurred under the paleo-stress field in late Funing episode, and were mainly distributed near the Shigang fault. The present stress field is of modified effect on the fractures, allowing the high values of fracture aperture, fracture density, porosity and permeability to appear in the northwestern Shi 3-Shi 6 fault block and Shi 4 fault block, the northern Jin 4 fault block and the middle and southern Shi 11-Shi 5 fault block.

Key words: Shigang oilfield, tectonic stress field, fracture prediction, finite element analysis