The prospect of exploration in southern South China Sea is widest,but the seismic data are very rare and the quality is low.The deepwater block seismic data in southern South China Sea are constrained by low quality seismic data acquired in the 1970s,characterized by no navigation text,time uncertainty of record about seabed,serious lack of traces and very short cable,which results in unique seismic processing results with serious multiples,low signal-to-noise ratio and illegibility of stratigraphic structure record on paper.To solve these problems,the authors use and develop a set of key technologies that are suitable for seismic data processing in this area,such as using navigation reconstruction technique to solve the problem of lack of navigation text,using self-correlation technique to solve the problem of seabed records uncertainty,using the frequency limited F-K domain interpolation technique to solve the problem of lack of traces,using combination multiples suppression technique to solve the problem of multiples suppression caused by short cable.The final results show that the applications of key technologies make the seismic data achieve expected effect in this area.These technological achievements not only provide reliable seismic data for deepwater oil and gas exploration in southern South China Sea but also provide some ideas and techniques for similar low-quality seismic data processing.
张治忠, 谢岚, 陈华, 覃殿明, 何秋寒, 赵明, 常坤. 南海南部深水区低品质地震资料处理关键技术[J]. 物探与化探, 2019, 43(3): 576-583.
Zhi-Zhong ZHANG, Lan XIE, Hua CHEN, Dian-Min QIN, Qiu-Han HE, Min ZHAO, Kun CHANG. The key technologies for the processing of low-quality deepwater block seismic data in southern South China Sea. Geophysical and Geochemical Exploration, 2019, 43(3): 576-583.
Wu J Q, Gao H F, Sun G H . Geological structure and sedimentary systems of the Wan'an basin,Nansha waters[J]. Marine Geology & Quaternary Geology, 2012,32(5):1-11.
Zhang G C, Wang P J, Wu J F , et al. Tectonic cycle of marginal oceanic basin:A new evolution model of the South China Sea[J]. Earth Science Frontiers, 2015,22(3):27-37.
Jin F M, Lu J F, Sun C H , et al. Method for pe-processing of low-quality old seismic data and its application[J]. China Petroleum Exploration, 2014,1(19):42-49.
Tian J Q, Hu T Y . Application of feedback iteration on surface-related multiple suppression[J]. Geophysical Prospecting for Petroleum, 2008,47(5):449-454.
Zhang J H, Lu N , Lei L et al.Analysis of applied factor for using parabolic Radon transform to remove multiple[J]. Oil Geopgysical Prospecting, 2004,39(4):398-405.
[14]
Wiggins . Attenuation of complex water-bottom multiples by wave-equation-based prediction and subtraction[J]. Geophysics, 1988,53(5):1527-1539.
doi: 10.1190/1.1442434
[15]
Taner . Long-period sea-floor multiples and their suppression[J]. Geophysical Prospecting, 1980,28(3):30-48.
doi: 10.1111/gpr.1980.28.issue-1
[16]
Lu W . Adaptive multiple subtraction using independent component analysis[J]. Geophysics, 2006,71(5):179-184.
[17]
Verschuur D J, Berkhout A J . Adaptive surface-related multiple elimination[J]. Geophysics, 1992,57(9):1166-1177.
doi: 10.1190/1.1443330
[18]
Berkhout A J, Verschuur D J . Estimation of multiple scattering by iterative inversion,Part I:Theoretical considerations[J]. Geophysics, 1997,62(5):1586-1595.
doi: 10.1190/1.1444261
[19]
Verschuur D J, Berkhout A J . Estimation of multiple scattering by iterative inversion,Part II:Practical aspects and examples[J]. Geophysics, 1997,62(5):1596-1611.
doi: 10.1190/1.1444262