地应力测井评价在超前注水油田开发中的应用——以三塘湖盆地牛圈湖油田西山窑组油藏为例

Evaluation of Ground Stress with Logging Data and Its Application in Oilfield Development by Advanced Water Injection

针对三塘湖盆地牛圈湖油田中侏罗统西山窑组(J2x)油藏的特殊性(低孔、特低渗、低饱和度以及异常低压等油藏特征),分析了地应力研究在超前注水油田开发中的重要性。在此基础上,利用常规测井、偶极子声波测井、地层倾角测井等资料,统计出了该地区现今水平最大主应力方位,定量计算了破裂压力、地应力等参数,为调整注采井网、优化超破压注水设计,提高水力压裂效果,提供了可靠的决策依据。

According to the characteristics (low porosity,ultra-low permeability,low saturation and abnormal pressure) of the Middle Jurassic Xishanyao Formation (J2x) in Niujuanhu Oilfield in Santanghu Basin,the importance of the ground stress in advanced water injection of oilfield development was analyzed.By using conventional logging data,dipole acoustic logging data,and diplog information,the azimuth of the maximum horizontal principal stress is established,the parameters of breakdown pressure and the ground stress are calculated ,which provide a reliable basis for adjusting well patterns of water flooding,optimizing the design of water injection by overpressure,and enhancing the effectiveness of hydraulic fracturing.