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方法利用岩心测试、地层裂缝描述、现场测试及数值模拟方法．研究彩南油田西山窑组裂缝性低渗透油藏的应力场及裂缝分布特征。目的提高该油藏的开发效果。结果彩9井区西山窑组三向主应力的关系为σV＞σH＞σh，水平两向主应力之差约为5MPa．水平最大主应力方向为110°；在平面上．最小主应力梯度变化范围为0．01138～0．01446MPa／m，且与地层压力的递减速度成正比；在彩9井区西山窑组油藏中．NWW向裂缝分布广、规模大，且与水平最大主应力方向和彩9井断裂带走向一致．是造成水淹、水窜的主导因素。结论根据裂缝分布，可选择射孔段裂缝不发育或未引起水淹（窜）的注水井，进行高强度注水．以补充油层亏空；根据水平最小主应力梯度分布状况，选择注水压力。
The method uses core testing, stratum fracture description, field testing and numerical simulation methods. Study on the stress field and fracture distribution in the fractured low permeability reservoir in Xishanyao Formation, Caineng Oilfield. Purpose To improve the development effectiveness of this reservoir. Results The relationship between three-direction principal stress of Xishanyao Formation in Cai 9 well is σV> σH> σh, and the difference between horizontal principal stress and horizontal stress is about 5MPa. The horizontal maximum principal stress direction is 110 °; in the plane. The range of minimum principal stress gradient is 0.01138 ~ 0.01446MPa / m, and is proportional to the decreasing rate of formation pressure; in the reservoir of Xishanyao Formation in Cai 9 well. NWW fractures are widely distributed and large in scale, and are consistent with the direction of the maximum horizontal principal stress and the fracture zone of Cai 9 well. Is caused by flooding, water channeling the dominant factor. Conclusions According to the distribution of fractures, it is possible to select water injection wells with perforations whose fractures are not developed or not flooded, and to inject water with high intensity. In order to replenish the reservoir deficit; according to the distribution of minimum horizontal principal stress gradient, select the injection pressure.