Abstract:Seismic survey in piedmont zone leads quite a few problems such as low S/N, severe static corrections, and complex seismic wave propagation caused by both rugged topography and complex structures. To solve the problems, we propose an approach in the paper and establish a set of seismic imaging processing flows based on "true-surface" seismic imaging plane and high frequency static corrections. The core of the flows is the depth domain velocity model building and inverse time migration on rugged topography surface. Both wave field continuation and imaging are implemented for the true rugged topography surface. Long wavelength static corrections are solved in migration imaging process, to better deal with the complex seismic imaging in piedmont zones. Test results on model and field data show that the proposed approach can better deal with seismic imaging in rugged topography and complex structure areas, and is an ideal way for seismic imaging in complex piedmont zones.
Guo Nianmin,Wu Guochen.High-order finite difference method in reverse-time migration with variable grids based on PML boundary condition.OGP,2012,47(2):256-266.
Zhang Zhiyu,Tan Xianbo,Huang Luyao et al.Anti-dispersion finite difference simulation and reverse-time migration for wave equations.OGP,2014,49(6):1115-1121.
Sun Wenbo,Sun Zandong.VSP reverse time migration based on the pseudo-spectral method and its applications.Chinese Journal of Geophysics,2010,53(9):2196-2203.
[7]
薛东川,王尚旭.波动方程有限元叠前逆时偏移.石油地球物理勘探,2008,43(1):18-21.
Xue Dongchuan, Wang Shangxu.Wave-equation finite-element prestack reverse-time migration.OGP,2008,43(1):18-21.
Dong Yuan,Yang Huizhu,Du Qizhen.Study on reverse-time migration of two-dimensional wave equation with finite element-finite difference method.Journal of the University of Petroleum,China,2003,27(6):25-29.
He Bingshou,Zhang Huixing,Wei Xiucheng et al.Imaging conditions for two-way acoustic wave equation pre-stack reverse-time depthmigration.OGP,2010,45(2):237-243.
Ding Liang,Liu Yang.Pre-stack reverse-time migration based on normalized wavefield decomposition cross-correlation imaging condition.OGP,2012,47(3):411-417.
[12]
薛东川.几种叠前逆时偏移成像条件的比较.石油地球物理勘探,2013,48(2):222-227.
Xue Dongchuan.Imaging condition comparison of prestack reverse-time migration.OGP,2013,48(2):222-227.
[13]
Zhang Y,Sun J,Gray S. Reverse-time migration:Amplitude and implementation issues.SEG Technical Program Expanded Abstracts,2007,26:2145-2149.
[14]
Zhang Y,Sun J. Practical issues of reverse time migration:true amplitude gathers,noise removal and harnlonic-source encoding.First Break,2009,26(1):29-35.
Liu Shaoyong,Cai Jiexiong,Wang Huazhong et al. Technology and application of beam ray prestack imaging method in foothill areas. GPP, 2012, 51(6):598-605.
[21]
方伍宝,刘定进,蔡杰雄等.深度域地震成像新技术理论与实践.北京:中国石化出版社,2014.
Fang Wubao, Liu Dingjin,Cai Jiexiong et al.New Ttechnology Theory and Practices of Seismic Imaging in Depth Domain.Sinopec Press,Beijing,2014.