随钻方位电磁波电阻率成像模拟及应用

Abstract

Abstract:

Azimuthal propagation resistivity while drilling imaging data plays important role in geosteering. The electromagnetic field of different tool face has been simulated by three-dimensional finite difference method; the azimuthal resistivity measurement principle and imaging method is then analyzed. The numerical results show that adding tilt or transverse antenna to conventional logging while drilling (LWD) resistivity tools could get azimuth of formation. The imaging is influenced by relative deviation angles, resistivity contrast and geological structure. The imaging data can be used to forecast and determine formation boundaries, azimuth and anisotropic formation strikes. The amplitude ratio resistivity imaging is better than phase shift resistivity. In homogenous anisotropic medium, the larger coils spacing and higher frequency, the greater the influence of vertical resistivity to apparent resistivity. The bigger coil spacing, the stronger directional amplitude signals and the farther prediction distance to formation boundaries.

Key words: azimuthal resistivity while drilling, imaging, tilted or transverse antenna, geosteering

CLC Number:

P631.811

Yang Zhen，Yang Jinzhou，Han Laiju. Numerical Simulation and Application of Azimuthal Propagation Resistivity Imaging While Drilling[J].Journal of Jilin University(Earth Science Edition), 2013, 43(6): 2035-2043.

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Numerical Simulation and Application of Azimuthal Propagation Resistivity Imaging While Drilling

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