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Target-oriented reverse time migration in transverse isotropy media

Song Liwei, Shi Ying, Chen Shumin, Wang Weihong, Ke Xuan

Acta Geophysica

2021

Vol. 69, no. 1

125--134

Reverse time migration (RTM) is a high-precision imaging method for complex structures. However, without considering seismic anisotropy of the subsurface, RTM utilizing the anisotropic seismic data may produce blurred structure images with incorrect positions. Moreover, some exploration targets with insufcient illumination cannot be efectively identifed in the migration profle, especially the subsalt structure which is usually the favorable petroleum region for the hydrocarbon reservoir. Therefore, we develop a target-oriented RTM in transverse isotropy media (TO-TIRTM). Instead of classical RTM, the novel method extracts wavefelds that carry relatively more information about the exploration target to image structure. In the imaging condition, the constraint with excitation time is introduced to eliminate the interference of multipath on the image. Using synthetic examples, we determined that the kinematic characteristic of wavefeld is closely related to aniso tropic parameters, and the proposed method has prominent advantages over conventional RTM for imaging insufcient illumination structure.