远震层析成像在柴西狮子沟构造背景研究中的应用
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摘要
利用2004—2007年在柴达木盆地西部狮子沟地区布设的地震台站的连续观测资料,挑选远震P波到时,采用远震体波走时层析成像方法进行反演处理,获得了该地区地下三维速度结构图象.反演结果表明,在研究观测地区西南侧存在一近北西走向的低速异常体,以较大倾角向北东方向插入;在该低速异常体的北部、东北部和东部环绕着相对高速的异常,其走向和分布范围基本与狮子沟背斜构造一致.
Using teleseismic body wave traveltime tomography to invert the picked P-wave traveltimes,the images of three-dimensional seismic velocity structure are obtained for the Shizigou region in western Qaidam basin.The seismic data we used were continuously recorded on the stations deployed during 2004—2007 in Shizigou region.The inversion result indicates that there is a NW-trending low velocity anomaly beneath the study region.This anomaly inclines toward northeast in a high dipping angle.The low velocity anomaly is surrounded by a high velocity anomaly to the north,the northeast and the east.The strike and the coverage of the high anomaly coincide well with the Shizigou anticline.
Using teleseismic body wave traveltime tomography to invert the picked P-wave traveltimes,the images of three-dimensional seismic velocity structure are obtained for the Shizigou region in western Qaidam basin.The seismic data we used were continuously recorded on the stations deployed during 2004—2007 in Shizigou region.The inversion result indicates that there is a NW-trending low velocity anomaly beneath the study region.This anomaly inclines toward northeast in a high dipping angle.The low velocity anomaly is surrounded by a high velocity anomaly to the north,the northeast and the east.The strike and the coverage of the high anomaly coincide well with the Shizigou anticline.
引文
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和锐,杨建思,张翼.2007.地震层析成像方法综述[J].CT理论与应用研究,16(1):35-48.
李元奎,王铁成.2001.柴达木盆地狮子沟地区中深层裂缝性油藏[J].石油勘探与开发,28(6):12-15.
秦嘉政,楼海,钱晓东.2006.澜沧江流域重大水电工程地区地震层析成像[J].地震研究,29(4):317-324.
史大年,吕庆田,徐明才,赵金花.2004.铜陵矿集区地壳浅表结构的地震层析研究[J].矿产地质,23(3):383-389.
史大年,姜枚,马开义,薛光琦,董英君,Poupinet G,Wittlinger G,Herquel G.1999.阿尔金断裂带地壳和上地幔结构的P波层析成像[J].地球物理学报,42(3):341-350.
王小凤,冯梅,史大年,马寅生,陈宣华,区明益,霍光辉,王连庆,田晓娟,张西娟,李会军,李国岐,蒋荣宝.2006.微地震台阵网天然地震层析成像技术在油田深层构造解析中的应用[J].地质通报,25(9/10):1028-1031.
杨文采.1997.地球物理反演的理论与方法[M].北京:地质出版社:1-271.
尹成明,江波,韩秦鹏,吴剑峰.2006.柴达木盆地石油勘探潜力及勘探方向[J].石油地质,6:38-41.
Aki K,Christoffersson A,Husebye E S.1976.Three-dimensional seismic structure of thelithosphere under Montanala-sa[J].Bull Seism Soc Amer,66(2):501-524.
Aki K,Christoffersson A,Husebye E S.1977.Determination of the three-dimensional seismic structure of the litho-sphere[J].J Geophy Res,82(2):277-296.
Aki K,Richards P G.1980.Quantitative Seismology:Theoryand Methods,Vol2[M].New York:W HFreeman andCompany:559-932.
Evans J R,Achauer U.1993.Teleseismic velocity tomography using the ACH method:Theory and application to conti-nental-scale studies[C]∥Iyer H M,Hirahara Keds.Seimic Tomography:Theoryand Practice.London:Chapmanand Hall:319-360.
Poupinet G,Arndt N,Vacher P.2003.Seismic tomography beneath stable tectonic regions and the origin and composi-tion of the continental lithospheric mantle[J].Earth Planet Sci Lett,212(1—2):89-101.
Rawlinson N,Sambridge M.2003.Seismic traveltime tomography of the crust andlithosphere[J].Advancesin Geophys-ics,46:81-198.
Thurber C H.2003.Seismic tomography of the lithosphere with body waves[J].Pure Appl Geophys,160:717-737.
Zhao D P,Kayal J R.2000.Impact of seismic tomography on earth sciences,special section:Seismology[J].CurrentScience,79(9):1208-1214.
Zhao D P,Maruyama S,Omori S.2007.Mantle dynamics of western pacific and east Asia:Insight fromseismic tomo-graphy and mineral physics[J].Gondwana Research,11(1—2):120-131.
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