YUE YuBo,
LI ZhenChun,
QIAN ZhongPing et al
.2018.Optimized imaging schemes of PS-wave Kirchhoff prestack time migration.Chinese Journal Of Geophysics,61(3): 1188-1195,doi: 10.6038/cjg2018L0196
Abstract：PS-wave Kirchhoff time migration is a crucial step in the processing flow of converted wave data. However, because of the different propagation velocities and mechanisms of downing-going P-waves and up-going S-waves, its implementation is quite different from that of PP-wave Kirchhoff migration. In this paper, we discuss several important technical issues of PS-wave Kirchhoff time migration in a VTI medium. First, we derive a simplified PS-wave migration amplitude weight based on constant velocities, which can both ensure computation efficiency and amplitude accuracy. Secondly, we derive the maximum aliasing-free frequency formula based on straight ray assumption to filter operator aliasing. Then, we choose an optimized migration aperture which is symmetrical with common conversion points so as to save computational expense and reduce migration noise. In addition, in order to eliminate the influence of non-smoothness caused by the traditional linear interpolation method, we propose to use the cubic convolution interpolation method to calculate the parameters at fine image grids. Tests on real datasets demonstrate the validity of our methods.
Abma R, Sun J, Bernitsas N. 1999. Antialiasing methods in Kirchhoff migration. Geophysics, 64(6):1783-1792. Bleistein N, Cohen J K, Stockwell J W. 2001. Mathematics of Multidimensional Seismic Imaging, Migration, and Inversion. New York:Springer. Dellinger J A,Gray S H, Murphy G E, et al. 2000. Efficient 2.5-D true-amplitude migration. Geophysics, 65(3):943-950. Du Q Z, Li F, Hou B, et al. 2011. Angle-domain migration velocity analysis based on elastic-wave Kirchhoff prestack depth migration. Chinese Journal of Geophysics (in Chinese), 54(5):1327-1339, doi:10.3969/j.issn.0001-5733.2011.05.022. Keys R G. 1981. Cubic convolution interpolation for digital image processing. IEEE Transactions on Acoustics, Speech, and Signal Processing, 29(6):1153-1160. Kuo J T, Dai T F. 1984. Kirchhoff elastic wave migration for the case noncoincident source and receiver. Geophysics, 49(2):1223-1238. Li X Y, Dai H C, Mancini F. 2007. Converted-wave imaging in anisotropic media:theory and case studies. Geophysical Prospecting, 55(3):345-363. Liu G F, Liu H, Li B, et al. 2010. Direct pre-stack time migration on rugged topography.Oil Geophysical Prospecting (in Chinese), 45(2):196-200. Lumley D E, Claerbout J F, Bevc D. 2001. Anti-aliased Kirchhoff 3-D migration.//71th Ann. Internat Mtg., Soc. Expi. Geophys.. Expanded Abstracts. Lüth S, Buske S, Giese R, et al. 2005. Fresnel volume migration of multicomponent data. Geophysics, 70(6):S12-S129. Schleicher J, Tygel M, Hubral P. 1993. 3-D true amplitude finite-offset migration. Geophysics, 58(8):1112-1126. Sun J. 2000. Limited-aperture migration. Geophysics, 65(2):584-595. Sun Z Q, Sun J G, Yue Y B, et al. 2016. Ray tracing using GMM-ULTI method in the random media with complex topography. Chinese Journal of Geophysics (in Chinese), 59(7):2615-2627, doi:10.6038/cjg20160725. Thomsen L. 1999. Converted-wave reflection seismology over inhomogeneous, anisotropic media. Geophysics, 64(3):678-690. Wang H Z, Liu S Y, Yang Q Y, et al. 2013. Exploration strategy and imaging method in mountain area. Oil Geophysical Prospecting (in Chinese), 48(1):151-159. Yue Y B, Li Z C, Qian Z Q, et al. 2012. Amplitude-preserved Gaussian beam migration under complex topographic conditions. Chinese Journal of Geophysics (in Chinese), 55(4):1376-1383, doi:10.6038/j.issn.0001-5733.2012.04.033. Zhang Y, Gray S, Sun J, et al. 2001. Theory of migration anti-aliasing.//71th Ann. Internat. Mtg., Soc. Expi. Geophys. Expanded Abstracts, 997-1000. Zhang Y, Gray S, Young J. 2000. Exact and approximate weights for Kirchhoff migration.//70th Ann. Internat. Mtg., Soc. Expi. Geophys. Expanded Abstracts, 1036-1039. 杜启振, 李芳, 侯波等. 2011. 角度域弹性波Kirchhoff叠前深度偏移速度分析方法. 地球物理学报, 54(5):1327-1339, doi:10.3969/j.issn.0001-5733.2011.05.022. 刘国峰, 刘洪, 李博等. 2010. 起伏地表直接叠前时间偏移. 石油地球物理勘探, 45(2):196-200. 孙章庆, 孙建国, 岳玉波等. 2016. 复杂山地随机介质GMM-ULTI法射线追踪. 地球物理学报, 59(7):2615-2627, doi:10.6038/cjg20160725. 王华忠, 刘少勇, 杨勤勇等. 2013. 山前带地震勘探策略与成像处理方法. 石油地球物理勘探, 48(1):151-159. 岳玉波, 李振春, 钱忠平等. 2012. 复杂地表条件下保幅高斯束偏移. 地球物理学报, 55(4):1376-1383, doi:10.6038/j.issn.0001-5733.2012.04.033.
| 
