利用岩石的Kaiser效应测定储层地应力

 用单轴压缩试验测试岩石Kaiser效应特征，进而确定岩体地应力状态的方法，在岩体工程实践中得到广泛的应用。长庆靖安油田长6储层属于低孔低渗储层，需要进行水力压裂后才能得到高效地开发，为此必须研究该储层的地应力。用岩石的Kaiser效应，结合岩芯古地磁定向来研究储层19口井的地应力。研究结果表明，岩石声发射得到的最小主应力与水压致裂瞬时停泵法进行比较，大小吻合较好，而用岩芯古地磁定向结合岩石的声发射测试，能准确测定出地层中主应力分布的方向，与地层倾角测井解释成果比较接近。

IN-SITUSTRESS MEASUREMENT OF RESERVOIR USING KAISER EFFECT OF ROCK

The acoustic emission(AE) technique is investigated to measure rock in-situ stress using the Kaiser effect of rock under uniaxial compression，which characterizes AE increase in an increasing stress exceeds the previous stress. The rock cores are obtained from the vertically drilled exploratory boreholes in Jingan oil field. It is shown that the commonly used Kaiser effect method for estimating in-situ stress is in accordance with the results obtained by instantaneous shut-in method of hydraulic fracturing. And the orientation of the maximum horizontal stress in reservoir by Kaiser effect combining paleomagnetic orientation of cores is also accordance with the results obtained by diplog.