Abstract
One of the problems experienced in marine geophysical exploration is that the layered features in the migration imaging profile are blurred and the seismic energy reflected is weaker in the middle or lower parts. In this study we model the seismic wavefield records in the undulating seafloor when there is both a slight change and significant change in seafloor topography to analyze its influence on the seismic reflection data and migration imaging profiles. We compare and analyze the wave field records collected at the same point on the original and modified velocity models, and the cross-bonding resulting migration imaging profiles. The results show that whether the seismic reflection data collection is performed along the direction of the survey line or against the direction of the survey line, slight changes in the seafloor topography have little effect on the wave field records and the migration profile, while significant changes in the seafloor topography have great effect on both the wave field records and migration profile.
Similar content being viewed by others
References
Chang Xu, Liu Yike, Du Xiangdong, et al. 2008. Seismic imaging under the irregular deep water bottom. Chinese Journal of Geophysics (in Chinese), 51(1): 228–234
Chen Li, Ge Yong. 2005. The necessity of pre-stack depth migration for seismic data from rough deep sea bottom. China Offshore Oil and Gas (in Chinese), 17(1): 12–15
Dan Zhiwei, Li Sanfu, Liu Jieming. 2011. Application of forward modeling technology to design of deepwater seismic acquisition. Chinese Journal of Engineering Geophysics (in Chinese), 8(2): 149–154
Deng Yong, Li Lie, Chai Jitang, et al. 2010. An analysis of impacted factors on seismic data quality in the deepwater area, Qiongdongnan basin. China Offshore Oil and Gas (in Chinese), 22(6): 382–386
Duan Tiejun, Zhang Kang. 2006. Direction and areas of oil and gas exploration in deep water regions in China’s sea area. Petroleum & Petrochemical Today (in Chinese), 14(8): 23–25
Han Fuxing, Sun Jianguo, Wang Kun. 2012. The influence of sea wa-ter velocity variation on seismic traveltimes, ray paths, and amplitude. Applied Geophysics, 9(3): 335–341
Han Fuxing, Sun Jianguo, Wang Kun. 2013. Study of wave front geometric diffusion correction based on velocity variation of sea water. Geophysical Annual Conference, 8
Li Qingping. 2006. The situation and challenges for deepwater oil and gas exploration and exploitation in China. China Offshore Oil and Gas (in Chinese), 18(2): 130–133
Munk W. 1974. Sound channel in an exponentially stratified ocean, with application to SOFAR. The Journal of the Acoustical Society of America, 55(2): 220–226, doi: https://doi.org/10.1121/1.1914492
Song Yang, Song Haibin, Chen Lin, et al. 2010. Sea water thermohaline structure inversion from seismic data. Chinese Journal of Geophysics (in Chinese), 53(11): 2696–2702
Tao Weixiang, Zhao Zhigang, He Shibin, et al. 2005. Petroleum geological conditions and exploration prospects in deepwater area of northwestern South China Sea. Acta Geosicientia Sinica (in Chinese), 26(4): 359–364
Yang Kai, Li Lie. 2010. The effect of rough deep sea Bottom on characters of seismic wave in underlying reflectors. Chinese Journal of Engineering Geophysics (in Chinese), 7(1): 1–6
Zhu Weilin, Zhang Gongcheng, Gao Le. 2008. Geological characteristics and exploration objectives of hydrocarbons in the northern continental margin basin of South China Sea. Acta Petrolei Sinica, 29(1): 1–9, doi: https://doi.org/10.1111/j.1745-7254.2008.00742.x
Author information
Authors and Affiliations
Corresponding author
Additional information
Foundation item: The National Natural Science Foundation of China under contract Nos 41504084 and 41274120.
Rights and permissions
About this article
Cite this article
Han, F., Wang, K. & Sun, J. The influence of irregular seafloor topography on the seismic wave field and migration imaging. Acta Oceanol. Sin. 38, 151–158 (2019). https://doi.org/10.1007/s13131-019-1407-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s13131-019-1407-5