A three-component geophone orientation method based on direct P-wave polarization
Zhang Wenbo1, Li Jianfeng1, Sun Pengyuan1, Nie Hongmei1, Guo Min2, Lei Na1
1. Research & Development Center, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China; 2. Acquisition Technique Support Department, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract：For ocean bottom cable (OBC) surveys, it is difficult to precisely control the orientation of ocean-bottom seismometers in the marine environment. In this case, different wave energy will be projected to all the three components and will cause adverse influence on the subsequent processing imaging and inversion. This paper proposes a three-component geophone orientation estimation method by polarization analysis of three-component seismic records. Firstly the particle movement direction of the direct P-wave can be estimated with the principal eigenvector of the covariance matrix formed by the amplitudes of the direct P-wave of three-component seismic records. Then the propagation direction of the direct P-wave can be calculated with the source-receiver geometry. Finally the horizontal and vertical deviation angles of three-component geophones can be obtained by the relation between the particle movement direction and the propagation direction of the direct P-waves in the assumption of isotropic and homogeneous medium. Tests on synthetic and real data show that the proposed method can accurately estimate orientation of three component geophones.
张文波, 李建峰, 孙鹏远, 聂红梅, 郭敏, 雷娜. 基于直达波偏振分析的三分量检波器定向方法[J]. 石油地球物理勘探, 2017, 52(s2): 19-25.
Zhang Wenbo, Li Jianfeng, Sun Pengyuan, Nie Hongmei, Guo Min, Lei Na. A three-component geophone orientation method based on direct P-wave polarization. Oil Geophysical Prospecting, 2017, 52(s2): 19-25.
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