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结合我国南方海相页岩气藏的实际,针对页岩储层岩石力学性质与一般致密砂岩、碳酸盐岩相比的特殊性,对其进行了圆盘压裂试验和单轴压缩试验.圆盘压裂是一种间接测量岩石抗拉强度和弹性模量的试验方法,其理论基础是受压圆盘的应力和位移的弹性理论解.对于接触载荷分别为均匀、余弦函数和线性分布三种情形,给出了抗拉强度和弹性模量的计算公式.再使用试验数据,得到了页岩试样的抗拉强度和弹性模量.分析表明接触载荷的分布形式对抗拉强度影响很小,而对弹性模量值的影响较大.此外,还进行了取自相同深度岩芯的小圆柱试样单轴压缩试验,测得了页岩的抗压强度值,所得弹性模量与圆盘压裂试验相应结果基本一致,从而佐证了本文理论分析和试验方法的正确性.
Combining with the actuality of marine shale gas reservoirs in the southern part of China, we conducted a disk fracture test and a uniaxial compression test for the particularity of the rock mechanics properties of shale reservoirs compared with the general tight sandstone and carbonate rock. Disc fracturing is a kind of indirect measurement of rock tensile strength and elastic modulus of the test method, the theoretical basis of the disc pressure and displacement of the elastic theoretical solution for the contact load were uniform, the cosine function and the linear distribution The tensile strength and elastic modulus of the shale samples are obtained by using the experimental data.The results show that the distribution of the contact load has a great influence on the tensile strength Small, and greater impact on the elastic modulus.Moreover, a uniaxial compression test was also carried out on small cylindrical specimens from the same depth core, the compressive strength value of shale was measured, and the obtained elastic modulus and circular The corresponding results of plate fracturing test are basically the same, which proves the correctness of the theoretical analysis and test methods in this paper.