A new deep-towed,multi-channel high-resolution seismic system and its preliminary application in the South China Sea
WEI Zhengrong1,2,3, PEI Yan-liang2,3,4, LIU Baohua4,5
1. College of Geological Engineering and Geoma-tics, Chang'an University, Xi'an, Shaanxi 710046, China; 2. First Institute of Oceanography, MNR, Qingdao, Shandong 266061, China; 3. Key Laboratory of Marine Geology and Metallogeny, MNR, Qingdao, Shandong 266061, China; 4. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266061, China; 5. National Deep See Center, Qingdao, Shandong 266273, China
Abstract：The proprietary deep-towed,multi-channel high-resolution seismic system (Kuiyang-ST2000)consisting of a plasma electric spark source with the advantages of high sound source level，wide frequency band，and multichannel receiver array(48 channel，interval 3.125m) is capable of operating at 2000m in ocean.During operating,the source and the receiving cable are towed to the offshore floor (less than 100m).This shortens the distance between the system and the detected target,reduces the absorption and attenuation of seawater during the propagation of seismic signals,and can overcome multiples,bubbles and ocean noises caused by towing streamers on sea surface.The first test on the ST2000 system was completed in the E sea area of the South China Sea (the regional sea floor is about 1500m deep,and the system working depth is about 1400m).The final imaging profile after fine processing of test data has verified the superiority of the Kuiyang-ST2000 system,which overcomes the shortcomings of insufficient resolution of conventional marine multi-channel seismic systems.
魏峥嵘, 裴彦良, 刘保华. 深拖式多道高分辨率地震探测系统在南海首次应用[J]. 石油地球物理勘探, 2020, 55(5): 965-972.
WEI Zhengrong, PEI Yan-liang, LIU Baohua. A new deep-towed,multi-channel high-resolution seismic system and its preliminary application in the South China Sea. Oil Geophysical Prospecting, 2020, 55(5): 965-972.
Gettrust J F,Grimm M,Madosik S,et al.Results of a deep-tow multichannel survey on the Bermuda Rise[J].Geophysical Research Letters,1988,15(12):1413-1416.
[2]
Bowles F A,Gettrust J F,Rowe M.Geological interpretations based on deep-tow single channel and multichannel seismic data from the Bermuda Rise[J].Marine Geology,1991,96(3-4):279-293.
[3]
Ward P,Asakawa E,Shimizu S.High resolution,deep-tow seismic survey to investigate the methane hydrate stability zone in the Nankai Trough[J].Resource Geology,2010,54(1):115-124.
[4]
Rowe M M,Gettrust J F.Fine structure of methane hydrate-bearing sediments on the Blake Outer Ridge as determined from deep-tow multichannel seismic da-ta[J].Journal of Geophysical Research,1993,98(B1):463-473.
[5]
RoweMM,GettrustJF.Faultedstructureofthebottom simulating reflector on the Blake Ridge,western North Atlantic[J].Geology,1993,21(9):833-836.
Chapman N R,Gettrust J F,Walia R,et al.High-resolution,deep-towed,multichannel seismic survey of deep-sea gas hydrates off western Canada[J].Geophysics,2002,67(4):1038-1047.
[8]
孔繁达,何涛,George D S.深拖曳多道地震系统在北Cascadia边缘陆坡天然气水合物勘探中的应用[J].中国科学:地球科学,2012,42(3):331-342.KONG Fanda,HE Tao,George D S.Application of deep-towed multichannel seismic system for gas hydrate on mid-slope of northern Cascadia margin[J].Sci China Earth Sci,2012,42(3):331-342.
[9]
Leon P,Ker S,Gall Y L,et al.SYSIF:a new seismic tool for near bottom very high resolution profiling in deep water[C].Oceans IEEE,2009,1-5.
[10]
Marsset T,Marsset B,Ker S,et al.High and very high resolution deep-towed seismic system:Perfor-mance and examples from deep water Geohazard studies[J].Deep Sea Research Part Ⅰ:Oceanographic Research Papers,2010,57(4):628-637.
[11]
Ker S,Marsset B,Garziglia S,et al.High-resolution seismic imaging in deep sea from a joint deep-towed/OBH reflection experiment:application to a Mass Transport Complex offshore Nigeria[J].Geophysical Journal International,2010,182(3):1524-1542.
[12]
Marsset B,Menut E,Ker S,et al.Deep-towed high resolution multichannel seismic imaging[J].Deep Sea Research Part Ⅰ:Oceanographic Research Papers,2014,93(12):83-90.
[13]
Marsset B,Ker S,Thomas Y,et al.Deep-towed high resolution seismic imaging Ⅱ:Determination of P-wave velocity distribution[J].Deep Sea Research Part Ⅰ:Oceanographic Research Papers,2018,132:29-36.
[14]
王林飞,刘怀山,童思友.地震勘探空间分辨力分析[J].地球物理学进展,2009,24(2):626-633.WANG Linfei,LIU Huaishan,TONG Siyou.Analysis of spatial resolving power in seismic prospecting[J].Progress in Geophysics,2009,24(2):626-633.
[15]
Sheriff R E.Nomogram for Fresnel-zone calculation[J].Geophysics,1980,45(5):968-972.
[16]
方中华,赵铁虎,刘怀山,等.海洋深拖地震技术优势分析[J].物探化探计算技术,2014,36(3):59-63.FANG Zhonghua,ZHAO Tiehu,LIU Huaishan,et al.Analysis of the advantages of ocean deep-towed seismic technology[J].Computing Techniques for Geophysical and Geochemical Exploration,2014,36(3):59-63.
[17]
张连成,黄逸凡,刘振,等.水静压对脉冲放电及深拖等离子体震源的影响[J].浙江大学学报(工学版),2015,49(7):1395-1400.ZHANG Liancheng,HUANG Yifan,LIU Zhen,et al.Effects of hydrostatic pressure on pulsed discharge and deep-towed sesmicsource[J].Journal of Zhejiang University(Engineering Science),2015,49(7):1395-1400.
[18]
Walia R,Hannay D.Source and receiver geometry corrections for deep towed multichannel seismic data[J].Geophysical Research Letters,1999,26(13):1993-1996.
[19]
HE T,Spence G D,Wood W T,et al.Imaging a hydrate-related cold vent offshore Vancouver Island from deep-towed multichannel seismic data[J].Geophysics,2009,74(2):B23-B36.
[20]
吴晓川,蒲仁海,张功成,等.琼东南盆地南部深水区碳酸盐岩台地的地震解释[J].石油地球物理勘探,2017,52(2):381-391.WU Xiaochuan,PU Renhai,ZHANG Gongcheng,et al.Seismic interpretation of carbonate platform in the southern deepwater area,Qiongdongnan Basin[J].OilGeophysical Prospecting,2017,52(2):381-391.
[21]
吴晓川,张功成,蒲仁海.琼东南盆地碟形侵入体的地震响应特征及油气意义[J].石油地球物理勘探,2018,53(3):528-537.WU Xiaochuan,ZHANG Gongcheng,PU Renhai.Seismic characteristic and hydrocarbon significance of saucer-shaped intrusions in Qiongdongnan Basin[J].Oil Geophysical Prospecting,2018,53(3):528-537.
