水平层状非均质TI地层中仪器偏心情况下三维感应测井响应高效数值模拟与响应特征分析  

Efficient simulation and response analysis of three-dimensional induction logging in horizontally layered inhomogeneous TI formation with instrument eccentricity

作　　者：林蔺[1] 杨守文[1] 白彦[1,2] 陈涛 汪宏年[1] 

机构地区：[1]吉林大学物理学院,长春130012 [2]中国石油集团测井有限公司,西安710077

出　　处：《地球物理学报》2017年第5期2000-2010,共11页Chinese Journal of Geophysics

基　　金：国家自然科学基金(41574110;41104064);国家科技重大专项(2011ZX0520-001)资助

摘　　要：本文针对中国石油集团测井有限公司(CPL)三维阵列感应测井仪器(Three Dimensional Induction Tool,TDIT)的真实结构与参数,利用2.5维数值模式匹配技术研究建立水平层状非均质TI地层中仪器偏心情况下三维感应测井响应的高效数值模拟算法.首先,利用2.5维数值模式匹配技术给出水平层状非均质TI模型中偏心磁流源并矢Green函数的半解析解.在此基础上,结合三维阵列感应测井仪器参数以及测量过程中出现的仪器偏心与旋转等实际情况,通过叠加原理推导出该仪器响应的有效计算公式.最后,通过数值模拟结果分析考察仪器偏心、仪器自旋角等参数对测井响应的影响以及变化特征,为多分量感应资料处理与解释提供理论基础.Three-dimensional induction logging tool （TDIT） or multicomponent induction logging has been become one of the most important techniques in electrical logging methods because it is currently the unique way to obtain the formation information on horizontal and vertical conductivities simultaneously. CNPC Logging Limited Company （CPL） recently developed a three-dimensional array induction tool, which is composed of a tri-axial transmitter and eight groups of receiver coils. The four receivers close to the transmitter are conventional induction coils with offsets of 6,9,12 and 15 in （1 in=2.54 cm）, while the remaining four sets of coils are built as tri-axial receivers with spacing of 21,27,39 and 72 in, respectively. The tool operates at three different frequencies by sequentially exciting each of the coils （x,y, and z directions） in the tri-axial transmitter. The four conventional induction coils measure the signals excited at two highest frequencies only and each of other tri-axial receivers do two tensor signals at two lowest frequencies. At every logging depth, the tool can provide 96 different apparent conductivity curves with different vertical resolutions and investigation depths. Theoretically, we can extract the formation information such as horizontal and vertical conductivity, bed thickness, and dip angle of the bed from the TDIT data which allow us to effectively evaluate anisotropic reservoirs. However, the results of both the numerical simulation and actual well-site logging data show that although the logging data truly include the previous useful formation information, the tool response is also sensitive to the borehole environment parameters such as borehole radius, mud conductivity, tool eccentricity and spin angle. In order to establish some effective approaches for reconstruction of the useful formation parameters, it is very important to carefully and deeply investigate the comprehensive influence of the borehole environment and formation parameters on the TDIT response.In this

关 键 词：水平层状非均质TI地层 2.5维数值模式匹配算法 三维感应测井 偏心与自旋角 

分 类 号：P631[天文地球—地质矿产勘探]