大北地区高陡构造异常高压地层地应力测井计算方法

On Logging Calculation Method of In-situ Stress in High and Steep and Abnormal High Pressure Stratum

塔里木盆地库车坳陷大北地区是异常高压发育地带,高孔隙压力和强烈的构造运动使得地应力的大小及分布变得较为复杂。针对大北地区地层倾角较大、地层异常高压、地应力强的实际情况,基于应力分布的几何空间三角函数关系,以地应力实验和压裂试采实测值为刻度基准,利用地层倾角测井和声电成像测井解释得到的地层倾角数据,引入地层倾角DIP对地应力的影响系数,建立适合于大北地区高陡地层地应力的测井计算方法。处理了工区多口井的测井资料,其地应力计算值与实测值较为一致,能满足工程应用要求,值得推广应用。

In Tarim basin,Kuqa depression is a high and steep structure and abnormal high pressure development zone.High pore pressure and strong tectonic movement make the size and distribution of in-situ stress more complicated.Based on the geometry spatial trigonometric relation of stress distribution,and with sites stress test and the measured value of fracturing test mining as the basis,the DIP data from DIP logging and acoustic-electric imaging logging and the formation DIP influence coefficient on stress are used to establish the logging calculation model of in-situ stress which is suitable for high and steep stratum in DB area.Several wells logging data are processed,which shows the stress calculation value is consistent with the measured value,this method meets the engineering application requirements,and should be widely applied.