微球聚焦有限元数值计算中的预处理技术研究  

Preprocess Technique of Finite-element Computation for Micro-spherical Focused Log

作　　者：王晓鹏[1] 仵杰[1] 刘春雅[1] 张甜甜[1] 

机构地区：[1]西安石油大学,陕西西安710065

出　　处：《测井技术》2007年第2期124-127,共4页Well Logging Technology

摘　　要：针对微球聚焦测井仪器的测井预处理响应,在分析有限元数值计算方法的基础上,研究了自动网格剖分和自动节点编号预处理技术。在1/2空间三角形网格剖分中,采用极板对称轴对称分割的方法,提高了计算电位的对称性和计算精度。在网格自动编号中,提出了根据电极结构对求解区域分块的思想,保证电极的编号连续,满足有限元数值计算中等位面处理的要求。通过计算仪器常数、无侵和有侵地层模型验证了所设计预处理程序的有效性。The three-dimensional finite-element computation is an important method to compute responses of micro-spherical focused log （MSFL）. Based on an in-depth analysis of the computation, the preprocess techniques, including automatic grid dividing and automatic node numbering, are studied in detail. In triangle grid division to the half space, a symmetrical division method about the main electrode pad is used. It enhances the computation accuracy and the symmetry of the node potential. In automatic grid node numbering, put forward is a new idea which divides solving field into blocks according to the electrode structure feature. It ensures the numbering of the electrode is continuous and meets the demands of equipotential surface process in the computation. The preprocess technique has been validated by computing the tool constant and the response of MSFL in invaded and un-invaded formation.

关 键 词：微球形聚焦测井 三维有限元数值计算 自动网格剖分 自动节点编号 

分 类 号：P631.34[天文地球—地质矿产勘探] O242.21[天文地球—地质学]