Comparision of azimuthal anisotropy of P-wave and S-wave velocity based on wide azimuth seismic data
HE Feng1, LONG Fan2, HAN Gang1, CHEN Xiaozhi1, LI Jun2, WANG Huandi3
1. CNOOC Research Institute, Beijing 100027, China; 2. Shanghai Borui Energy Technology Company, Shanghai 202150, China; 3. Petroleum Industry Press, Beijing 100029, China
Abstract：Comparation of the azimuthal anisotropy of P-wave and S-wave velocity is very important for determining the sensitive parameters to azimuthal a-nisotropy. Based on prestack gathers in OVT domian in area B,Easten China, anisotropy inversion of P-wave and S-wave velocity was carried out to determine the anisotropic intensity and oritentation. The anisotropy of S-wave velocity is consis-tent with the fracture data (undeveloped fractures) revealed by known well data, such as logging data, and satisfies the relationship between faults and fractures (where faults are developed near the zone with high anisotropic intensity, and the anisotropic direction is roughly parallel to the fault strike). The anisotropy of P-wave velocity is obviously weaker than that of S-wave velocity, and does not satisfy the relationship between faults and fractures in the area, i.e. the anisotropy intensity is small around the fractures, or anisotropy oritentation is not approximately parallel to the fractures, or the two cross with acute angle. So,it is concluded that S-wave velocity is more sensitive to azimuthal anisotropy and more reliable for fractures prediction.
何峰, 龙凡, 韩刚, 陈晓智, 李俊, 王焕弟. 基于宽方位地震数据的纵、横波速度方位各向异性对比研究[J]. 石油地球物理勘探, 2021, 56(2): 289-294,301.
HE Feng, LONG Fan, HAN Gang, CHEN Xiaozhi, LI Jun, WANG Huandi. Comparision of azimuthal anisotropy of P-wave and S-wave velocity based on wide azimuth seismic data. Oil Geophysical Prospecting, 2021, 56(2): 289-294,301.
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