An effectiveness analysis of multiple depression technique in the Shallow water of the central uplift in South Yellow Sea
LIU Jun1,2,3, WU Shu-Yu2,3, GAO Jin-Yao4,5, CHEN Jian-Wen2,3
1. China University of Geosciences, Wuhan 430074, China;
2. Key Laboratory of Marine Hydrocarbon Resources and Environment Geology, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China;
3. Function Laboratory for Marine Mineral Resource Geology and Exploration, Qingdao 266071, China;
4. Key Laboratory of Submarine Geosciences of State Oceanic Administration, State Oceanic Administration, Hangzhou 310012, China;
5. Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
In the shallow area,the seabed related multiples can't be depressed effectively by use of conventional SRME method because of the shallow water depth and the lack of reflected signal from the seabed.Predictive deconvolution is often used for multiple wave suppressing,but deconvolution will destroy valid reflected signal whose wave cycle is similar to the seabed multiple; particularly in the hard seabed,the amplitude of the seabed multiple wave energy is stronger than the seabed reflection, and in this case,the method of predictive deconvolution cannot depress seabed related multiples entirely.In this paper,seabed related multiples depression by using the DWD + SRME combination method and DWD method is adopted for attenuating short period seabed related multiples,and the SRME method is used for suppressing long period free surface related multiples.In addition,the method of radon transform is used for removing inter layer multiples.The results show that the seabed related multiples have been depressed effectively by the combination method of DWD + SRME,and the shallow effective reflection signals are not harmed,the deep reflection signals appear gradually because interlayer multiples are attenuated by using Radon transform method.It is therefore held that the adoption of the combination method of DWD + SRME and Radon transform technique is a feasible multiple depression technique for the low SNR seismic data in the shallow water.
刘俊, 吴淑玉, 高金耀, 陈建文. 南黄海中部浅水区多次波衰减技术及其效果分析[J]. 物探与化探, 2016, 40(3): 568-577.
LIU Jun, WU Shu-Yu, GAO Jin-Yao, CHEN Jian-Wen. An effectiveness analysis of multiple depression technique in the Shallow water of the central uplift in South Yellow Sea. Geophysical and Geochemical Exploration, 2016, 40(3): 568-577.
