上下源、上下缆地震采集技术在珠江口的应用
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摘要
中国南海北部珠江口潮汕拗陷中生界地层以陆相湖盆沉积为主,但拗陷内岩浆活动普遍发育。该区水深变化较大(50~3000m)、断裂复杂、地层倾角较陡,以往采用常规地震采集方法所获资料存在中深层反射弱、同相轴不连续、信噪比低及成像质量差等问题,难以进行区域地层对比和综合解释。为此在该区进行了针对中生界目的层的以上下源、上下缆方式为主的地震采集方法试验,所获地震资料的品质令人满意,取得了较好的应用效果。
Mesozoic strata of Chao-shan depression in northern South China Sea is mainly of continental lake sedimentary basin.However magma activities widely developed in the depression.The water depth in the area changes dramatically,from 50 meters to more than 3000 meters.Subsurface is very complicated with many fractures and steep dips.Due to limits of the technology,seismic data acquired in the past have many problems such as weak reflectivity in deep layers,discontinuous events,low signal to noise ratio,and poor imaging.Focusing on targets in Mesozoic strata,we have carried out an over/under streamer and over/under source seismic acquisition test.And this test obtains valuable experience in seismic data acquisition in Mesozoic of Chao-shan region.The acquired seismic data have satisfactory quality for further study.
Mesozoic strata of Chao-shan depression in northern South China Sea is mainly of continental lake sedimentary basin.However magma activities widely developed in the depression.The water depth in the area changes dramatically,from 50 meters to more than 3000 meters.Subsurface is very complicated with many fractures and steep dips.Due to limits of the technology,seismic data acquired in the past have many problems such as weak reflectivity in deep layers,discontinuous events,low signal to noise ratio,and poor imaging.Focusing on targets in Mesozoic strata,we have carried out an over/under streamer and over/under source seismic acquisition test.And this test obtains valuable experience in seismic data acquisition in Mesozoic of Chao-shan region.The acquired seismic data have satisfactory quality for further study.
引文
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[2]Hill D,Combee L and Bacon J.Over/under acquisitionand data processing:The next quantumleap in seismictechnology?First Break,2006,24(6):81~95
[3]吴顺和,吴邕.地震波大地吸收的成因和意义.∥1998年中国地球物理学会第十四届学术年会论文集,1998Wu Shun-he,Wu Yong.The causes and significance ofthe seismic wave absorption.∥The Fourteenth Con-ference of China Geophysicist Society,1998
[4]Kragh E,Svendsen M,Kapadia D et al.A method forefficient broadband marine acquisition and processing.∥71st EAGE Conference and Exhibition,2009
[5]Moldoveanu N,Combee L,Egan AMet al.Over/undertowed-streamer acquisition:A method to extend seis-mic bandwidth to both higher and lower frequencies.The Leading Edge,2007,26(1):41~58
[6]Muyzert E.Do we reduce noise by towing deeper?∥69th EAGE Conference and Exhibition,2007
[7]Posthumus BJ.Deghosting using a twin streamer con-figuration.Geophysical Prospecting.1993,41(3):267~286
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