Abstract：A method for igneous rock velocity-depth model building is put forward in this paper. According to the special geological features of igneous rocks, we extract accurately the low frequency component of seismic imaging velocity from VSP and other priori information. Then we optimize velocity-depth model with three-dimensional grid tomography to obtain the high-frequency component of seismic imaging velocity. This method reduces the influence of multiple solutions in the process of velocity inversion, and then igneous rocks can be more accurately imaged. Application results on real data show that the proposed method can well image not only igneous rocks but also overlying strata under igneous rocks.
Wang Huazhong, Gong Yuelian, Wang Chengli. Seismic wave illumination analysis and imaging of complex structure. Chinese Geophysical Society 19th Annual Meeting,2003.
[4]
韩站一.火成岩下伏地层地震反射波场特征研究.石油物探, 2009,48(3): 226-231.
Han Zhanyi. Study on seismic reflection wave field characteristics of formations below igneous rock. GPP,2009,48(3): 226-231.
Liu Wenqing, Wang Xiwen, Wang Yuchao et al. Application of velocity modeling and reverse time migration to subsalt structure. Chinese Journal Geophy-sics, 2013,65(2): 616-625.
Guo Shuxiang. Processing technology of seismic data acquired in igneous rock area:Example of JiYang Depression in ShengLi Oilfiled. OGP, 2013, 48(2): 228-238.
Jiang Xianyong, Wang Xiwen, Qin Guangsheng et al. Studying uncertainty of deep seismic velocity ana-lysis. OGP, 2005, 40(1): 35-41.
[9]
Stork C. Reflection tomography in the postmigrated domain.Geophysics,1992,57(5):680-692.
[10]
Kosloff D,Sherwood J,Koren Z et al. Velocity and interface depth determination by tomography of depth migrated gathers.Geophysics,1996,61(5):1511-1523.
Chen Hanlin, Yang Shufeng, Li Zilong et al. Spatial and temporal characteristics of Permian large igneous province in Tarim Basin. Xinjiang Petroleum Geology, 2009,30(2): 179-182.
