论文部分内容阅读
本文以二维岩心图像的微观孔隙结构特征为基础,采用过程法模拟实际岩心的沉积、压实、胶结过程,并建立三维数字岩心模型.采用有限元法模拟所建岩心模型的导电特性,探讨阿尔奇公式在微观数字岩心领域的适用性,实现数字岩心的导电性差异分析.研究表明所建数字岩心模型的电阻率随孔隙度呈指数关系变化,这与阿尔奇公式的表现形式一致.在三个主轴方向上,岩石系数和胶结指数值的大小和变化规律与理论结果较为接近,说明所建立的数字岩心模型在导电性上表现出各向异性,而用有限元法计算数字岩心模型导电性的具有较高的可靠性.
Based on the microscopic pore structure of two-dimensional core images, the authors used the process method to simulate the actual core sedimentation, compaction and cementation, and established a three-dimensional digital core model. The finite element method was used to simulate the conductive characteristics of the core model. Archie’s applicability in the field of microscopic digital cores and the difference of conductivity of digital cores are analyzed.The results show that the resistivity of the constructed digital core models varies exponentially with the porosity, which is consistent with the Archie formula The magnitudes and variations of the rock coefficient and the cementation index in the three principal axes are close to the theoretical ones, which shows that the numerical core model established shows anisotropy in conductivity. However, the finite element method is used to calculate the conductivity of the digital core model Sex with high reliability.