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岩石压缩系数一直是油藏工作者研究的热点问题,近年来黏土矿物的特殊性质对岩石压缩系数的影响已成为人们关注的重点。将岩石视为“骨架+黏土”的双组份模型,从岩石压缩系数定义出发,运用弹性力学理论,推导出双组份岩石压缩系数公式,得到岩石压缩系数与黏土含量及黏土力学性质的理论关系。以大牛地气田含黏土砂岩为对象,通过岩石变内压三轴压缩试验实测岩石压缩系数,并同时进行岩石的微观试验研究。计算出双组份压缩系数公式及其他几种不考虑黏土的传统压缩系数求解方法对应的岩石压缩系理论值,将理论值与岩石压缩系数实测值进行对比分析,结果发现,双组份岩石压缩系数理论值与实测结果更接近,说明了考虑黏土影响的双组份岩石压缩系数理论的合理性,该理论为油气储层岩石压缩系数的预测开拓了新的思路。
Rock compressibility has always been a hot issue for reservoir researchers. In recent years, the influence of the special properties of clay minerals on rock compressibility has become the focus of attention. Taking the rock as a two-component model of “skeleton + clay”, starting from the definition of rock compression coefficient, using the theory of elastic mechanics, the compressibility coefficient of two-component rock is deduced, and the compressibility of rock, clay content and mechanical properties of clay The theoretical relationship. Taking the clay sandstone in the Daniudi gas field as an example, the rock compressibility coefficient was measured by the rock compression internal pressure triaxial compression test, and the microscopic experimental study of the rock was carried out at the same time. Calculated two-component compressibility coefficient formula and several other do not consider the conventional solution of clay compression method corresponding to the theoretical value of the rock compression system, the theoretical value and the measured value of rock compressibility comparison, the results show that two-component rock compression The theoretical value of the coefficient is closer to the measured result, which shows the rationality of the theory of two-component rock compressibility considering the influence of clay. This theory opens up new ideas for the prediction of rock compressibility in oil and gas reservoirs.