天然气水合物准三维地震调查面元参数优化研究
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摘要
在我国某海域对天然气水合物研究过程中,使用了单源单缆准三维地震勘探方法,获得了天然气水合物矿体较好的三维成像效果。影响天然气水合物矿体三维成像的因素很多,其中,面元参数的选取是最直接的影响因素之一。本文分析了大量试验数据,结果表明,在确定了电缆的排列长度为2400m(192道)的前提下,面元横向最佳优化尺寸应为50m,处理面元为原始采集面元大小的1/2(即面元大小为12.5m×25m)时,可以兼顾地层的真实性和连续性。以此为基础可获得较高质量的准三维地震处理资料。
In a sea area of China,the "single source-single streamer quasi-three dimensional seismic survey" method was ap-plied in the gas-hydrate investigation,and a satisfying three-dimensional(3D) image was obtained.The bin parameter is one of the important parameters that can influence the 3D imaging.According to the result of data,if a streamer length of 2400m(192 channels) is fixed,the best optimization bin size(transverse) should be 50m and processing bin should be half of the origi-nal acquisition size,i.e.,12.5m×25m,which can take into account of the authenticity and continuity of strata.A good quality of the quasi-3D seismic image can then be obtained.
In a sea area of China,the "single source-single streamer quasi-three dimensional seismic survey" method was ap-plied in the gas-hydrate investigation,and a satisfying three-dimensional(3D) image was obtained.The bin parameter is one of the important parameters that can influence the 3D imaging.According to the result of data,if a streamer length of 2400m(192 channels) is fixed,the best optimization bin size(transverse) should be 50m and processing bin should be half of the origi-nal acquisition size,i.e.,12.5m×25m,which can take into account of the authenticity and continuity of strata.A good quality of the quasi-3D seismic image can then be obtained.
引文
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[14]罗文造,韦成龙,王立明,等.海上地质勘探主要采集参数的选取与验证[J].热带海洋学报,2009,28(4):93?101.
[2]张光学,黄永样,陈邦彦.海域天然气水合物地震学[M].北京:海洋出版社,2003:15?20.
[3]张光学,张明.天然气水合物地震识别技术[R]//广州海洋地质调查局.课题研究技术报告,2005:62?63.
[4]BERTIE J E,BATES F E,HENDRICKSEN D K.Seismic character of gas hydrates on the southeastern U.S.continen-tal margin[J].Marine Geophysical Researches,2006,53:71.
[5]ANDREAS CORDSEN.三维地震资料采集的观测系统设计[J].国外油气勘探,1998,10(5):586?598.
[6]杨文达.南海陆坡区天然气水合物地震波特征研究[J].上海地质,2004(1):39?45.
[7]CLAYPOOl G E,PRESLEY BJ,KAPLAN I R,et al.Initial reports of the deep sea drilling project,v.19[R].US Govern-ment Printing,2003:879?884.
[8]张光学,耿建华,刘学伟.天然气水合物探测技术[R]//广州海洋地质调查局.“十五863”课题研究技术报告,2005:1?3.
[9]何樵登,韩立国,朱建伟,等.地震波理论[M].长春:吉林大学出版社,2005:8.
[10]CORDSEN A.Narrow-versus wide-azimuth land 3D seismic surveys[J].The Leading Edge,2002,21(8):764?770.
[11]DAVIDSON D W,RIPMEESTER J A.Water:a comprehen-sive treatise[M].New York:Plenum press,2006:21-33.
[12]凌云,吴琳,陈波,等.宽/窄方位角勘探实例分析与评价(二)[J].石油地球物理勘探,2005,40(4):423?427.
[13]伍忠良,陆敬安.海洋地震勘探直达波综合效应分析[J].海洋技术,2006,25(1):111?114.
[14]罗文造,韦成龙,王立明,等.海上地质勘探主要采集参数的选取与验证[J].热带海洋学报,2009,28(4):93?101.
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