JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2015, Vol. 45 ›› Issue (6): 99-106.doi: 10.6040/j.issn.1672-3961.0.2014.259

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Research on the electromagnetic responses of azimuthal resistivity logging in formation boundaries

GAO Yang, KONG Fanmin, LI Kang   

  1. School of Information Science and Engineering, Shandong University, Jinan 250100, Shandong, China
  • Received:2014-09-16 Revised:2015-06-02 Online:2015-12-20 Published:2014-09-16

Abstract: The electromagnetic field of different azimuth was calculated by analytical method, and then its application for forecasting formation boundaries was researched. By studying the reflection and transmission of electromagnetic wave on each layer, an analytic expression for electromagnetic wave was obtained, which satisfied boundary condition of each layer, and then the amplitude-attenuation and phase-shift of electromagnetic wave resistivity logging were computed. The sensitivity to formation boundaries of directional electromagnetic measurements was analyzed, and the influence of formation relative dip angle and receiver antenna dip angle on directional measurements was also studied. The results showed that the directional detection range increased with the coil spacing and the thickness of target bed increasing. The change of directional amplitude-attenuation became more obvious with the formation relative dip angle and receiver antenna dip angle increasing when the tool was approaching formation boundary, and thus the sensitivity to formation boundaries increased. By combining azimuthal resistivity image with directional electromagnetic response, the results showed that adding tilt antenna to conventional logging while drilling resistivity tools, the formation boundaries could be accurately forecasted.

Key words: azimuthal resistivity, tilted antenna, formation boundary, directional amplitude attenuation, magnetic dipole, directional phase shift

CLC Number: 

  • P631.811
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