3D laterolog array sonde design and response simulation
Yin Cheng-Fang1,2, Ke Shi-Zhen1,2, Xu Wei1,2, Jiang Ming1,2, Zhang Lei-Jie1,2, and Tao Jie1,2
1. College of Geophysics and Information Engineering, China University of Petroleum, Beijing 102249, China.
2. Key Laboratory of Earth Prospecting and Information Technology, Beijing 102249, China.
Abstract A new three-dimensional laterolog array sonde (3D-LS) is presented. The 3D-LS is based on existing high-resolution laterolog array and azimuthal resistivity imaging sondes with radial, longitudinal, and circumferential detection abilities. Six investigation modes are designed using the 3D finite-element method and different investigation depths are simulated based on the pseudo-geometrical factor of the six modes. The invasion profile is described using multi-array radial logs. From the analysis of the pseudo-geometrical factor, the investigation depth of the 3D-LS is about 1.5 m for conductive invasion, which is close to that of the dual laterolog tool but greater than that of the highly integrated azimuthal laterolog sonde. The vertical and azimuthal resolution is also analyzed with the same method. The 3D-LS can detect low-resistivity anomalies of 0.5 m thickness and 15? around the borehole for infinitely thick formations. This study lays the foundation for more work on 3D laterolog array sonde for evaluating low-resistivity anomalies.
This project is sponsored by the National Oil and Gas Major Projects (No. 2011ZX05020-009).
Cite this article:
YIN Cheng-Fang,KE Shi-Zhen,XU Wei et al. 3D laterolog array sonde design and response simulation[J]. APPLIED GEOPHYSICS, 2014, 11(2): 223-234.
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2014, Vol. 11 
