基于有限元法的数字岩心导电性数值模拟

发布时间：2018-04-08 16:26

本文选题：数字岩心　切入点：数值模拟　出处：《地球物理学进展》2017年05期

【摘要】：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.
[Abstract]:Based on the microscopic pore structure characteristics of two-dimensional core images, the process method is used to simulate the deposition, compaction and cementation of actual cores, and a three-dimensional digital core model is established.The electric conductivity of the core model is simulated by finite element method, and the applicability of Archie formula in micro digital core is discussed, and the difference analysis of conductivity of digital core is realized.The results show that the resistivity of the digital core model varies exponentially with porosity, which is consistent with the expression of Archie formula.In the three principal axis directions, the magnitude and variation of rock coefficient and cementation index value are close to the theoretical results, which shows that the digital core model is anisotropic in conductivity.The calculation of conductivity of digital core model by finite element method has high reliability.
【作者单位】：核工业二一六大队;大庆钻探工程测井公司;
【基金】：新疆准噶尔盆地砂岩型铀矿资源调查评价(201609)资助
【分类号】：P618.13

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