石港油田低渗储层裂缝预测研究

Fracture Prediction of Low Permeability Reservoirs in Shigang Oilfield

利用地质、测井、岩心、现场测试等资料,采用地质学、岩石力学和数值模拟的方法,确定应力场发育方向和大小,并对该油田储层裂缝的分布特征进行了预测。研究认为该区裂缝是在阜宁晚期古应力场下产生,在现今应力场中被改造;石港断层带附近裂缝最为发育,裂缝优势发育方向与NNE向断裂一致;裂缝密度、开度高值区主要分布于石3断块与石4断块西北部、金4断块北部、石5断块中部和南部。研究成果为油田井网调整提供了主要地质依据。

Geologic,well logging,cores,field testing and the other data as well as geologic,rock mechanics and numerical methods were used to determine the developmental direction and size of stress field,and the fractural distribution of reservoirs was forecasted in the oilfield.Study result shows that the fractures are induced in late Funing palaeo-stress field and reconstructed in modern stress field,it was highly developed near Shigang fault zones,its beneficial growth direction is consistent with fractures in NNE;its density,the opening of the high value areas are mainly located in the west of Block SHI 3,4 and in the north of Block Jin 4 and in the middle and south of Block SHI 5.The results provide a geological basis for well pattern adjustment.