石港油田古近系阜宁组二段低渗透砂岩储集层裂缝研究

岩石的破裂、构造裂缝的产生主要受构造应力场的影响与控制。在构造应力场数值模拟的基础上,基于岩石破裂准则,预测了石港地区古近系阜宁组二段的储集层裂缝参数。裂缝在阜宁组沉积晚期的古构造应力场下产生,在断层附近最为发育,走向以近北北东向为主。现今应力对裂缝具有改造作用,裂缝的开度、密度、孔隙度和渗透率的高值区位于石3-石6断块与石4断块西北部、金4断块北部、石11-石5断块中部和南部。

Prediction of Fracture Parameter in Low Permeability Sandstone Reservoir of Fu-2 Member of Paleogene in Shigang Oilfield

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.