琼东南盆地中央峡谷上新统块体搬运沉积体系地震特征及其分布
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摘要
根据琼东南盆地深水区高分辨率2D/3D地震资料精细解释,和基于三维地震资料的相干分析,在琼东南盆地中央峡谷区发现了多期次的块体搬运沉积体系(MTDs)。研究表明,该区域块体搬运沉积体系包括3个主要的结构单元,即头部拉张区、体部滑移区和趾部挤压区,不同位置地震特征不同。大规模的块体搬运沉积体系构成了琼东南盆地中央峡谷区新近系以来地层中的重要沉积单元,并对深海沉积物的空间展布有重要的控制作用。上新世发育的一期块体搬运沉积体系,分布面积达300km2,厚度达240m,平面展布形态似扇形。高沉积物供给速率和不断的构造活动可能是该区域MTDs发育的主要原因。此外,地震活动、海平面变化也间接影响了MTDs的发育。
2D/3D seismic data and coherence of 3D seismic data in the deepwater area of Qiongdongnan Basin reveal the occurrence of multi-stage mass transport deposits(MTDs) in the Central Canyon of the basin.The MTDs of this region consist of three units,namely the headwall domain,the translational domain and the toe domain characterized by different seismic characteristics.Being regarded as an important part of deepwater deposition in the Central Canyon of Qiongdongnan Basin since Neogene,the large-scale MTDs have an important effect on the spatial distribution of sediment in the deepwater basin.The Pliocene MTDs are distributed in an area of 300 km2,with a thickness up to 240 m in a fan shape in planar distribution.The rapid sedimentary discharge and active tectonic movement may be the main reasons for the development of the MTDs in Central Canyon of Qiongdongnan Basin..In addition,earthquakes and fluctuation of sea level have a significant effect on the formation of the MTDs.
2D/3D seismic data and coherence of 3D seismic data in the deepwater area of Qiongdongnan Basin reveal the occurrence of multi-stage mass transport deposits(MTDs) in the Central Canyon of the basin.The MTDs of this region consist of three units,namely the headwall domain,the translational domain and the toe domain characterized by different seismic characteristics.Being regarded as an important part of deepwater deposition in the Central Canyon of Qiongdongnan Basin since Neogene,the large-scale MTDs have an important effect on the spatial distribution of sediment in the deepwater basin.The Pliocene MTDs are distributed in an area of 300 km2,with a thickness up to 240 m in a fan shape in planar distribution.The rapid sedimentary discharge and active tectonic movement may be the main reasons for the development of the MTDs in Central Canyon of Qiongdongnan Basin..In addition,earthquakes and fluctuation of sea level have a significant effect on the formation of the MTDs.
引文
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[21]Weimer P.Sequence stratigraphy,seismic geometries,anddepositional history of the Mississippi Fan,deep Gulf ofMexico[J].AAPG Bulletin,1990,74:425-453.
[22]黄维,汪品先.南海沉积物总量的统计:方法与结果[J].地球科学进展,2006(5):465-473.[HUANG Wei,WANGPinxian.The statistics of sediment mass in the South ChinaSea:method and result[J].Advance in Earth Science,2006,21(5):465-473.]
[23]王大伟,吴时国,董冬冬等.琼东南盆地第四纪块体搬运体系的地震特征[J].海洋地质与第四纪地质,2009,29(3):69-74.[WANG Dawei,WU Shiguo,DONG Dongdong,etal.Seismic characteristics of Quaternary mass transport de-posits in Qiongdongnan basin[J].Marine Geology and Qua-ternary Geology,2009,29(3):69-74.]
[24]Sun Q,Wu S,Luedmann T,et al.Geophysical evidence forcyclic sediment deposition on the southern slope of Qiong-dongnan Basin,South China Sea[J].Marine GeophysicalResearch,2011,32(3):415-428.
[2]王大伟,吴时国,吕福亮,等.南海深水块体搬运沉积体系及其油气勘探意义[J].中国石油大学学报,2011,35(5):14-19.[WANG Dawei,WU Shiguo,LV Fuliang,et al.Mass trans-port deposits and its significance for oil&gas exploration indeep-water regions of South China Sea[J].Journal of ChinaUniversity of Petroleum,2011,35(5):14-19.]
[3]李铁刚,曹奇原,李安春,等.从源到汇:大陆边缘的沉积作用[J].地球科学进展,2003,18(5):713-722.[LI Tigang,CAOQiyuan,LI Anchun,et al.Source to sink:Sedimentation inthe continental margins[J].Advance in Earth Sciences,2003,18(5):713-722.]
[4]吴时国,秦蕴珊.南海北部陆坡深水沉积体系研究[J].沉积学报,2009,27(5):922-930.[WU Shiguo,QIN Yunshan.The research of deepwater depositional system in the northernSouth China Sea[J].Acta Sedimentologica Sinica,2003,18(5):713-722.]
[5]刘军,庞雄,颜承志,等.南海北部陆坡白云深水区深水沉积结构要素[J].吉林大学学报:地球科学版,2011,41(4):992-998.[LIU Jun,PANG Xiong,YAN Chengzhi,et al.Deepwater depositional elements in Baiyun deepwater area ofthe northern continental slope,South China Sea[J].Journalof Jilin University(Earth Science Edition),2011,41(4):992-998.]
[6]Kvenvolden K A.Gas hydrate-geological perspective and glob-al change[J].Rev.Geophys,1993,31(2):173-187.
[7]Riedel M.,Bahk JJ,Scholz NA,et al.Mass-transport depos-its and gas hydrate occurrences in the Ulleung Basin,East Sea-Part 2:Gas hydrate content and fracture-induced anisotropy[J].Marine and Petroleum Geology,2012,35(1):91-104.
[8]Wang X J,Wu S G,Ma Y B,et al.Geophysical signatures as-sociated with fluid flow and gas hydrate occurrence in a tecton-ically quiescent sequence,Qiongdongnan Basin,South ChinaSea[J].Geofluids,2010,10(3):351-368.
[9]苏明,李俊良,姜涛,等.琼东南盆地中央峡谷的形态及成因[J].海洋地质与第四纪地质,2009,29(4):85-93.[SUMing,LI Junliang,JIANG Tao,et al.Morphological featuresand formation mechanism of central canyon in the Qiongdong-nan Basin,northern South China Sea[J].Marine Geology andQuaternary Geology,2009,29(4):85-93.]
[10]Yuan Shengqiang,Wu Shiguo,Ludmann Thomas,et al.Fine-grained Pleistocene deepwater turbidite channel systemon the slope of Qiongdongnan Basin,northern South ChinaSea[J].Marine and Petroleum Geology,2009,26:1441-1451.
[11]Yuan,Shengqiang,Lv Fuliang,Wu Shiguo,et al.Seismicstratigraphy of the Qiongdongnan deep sea channel,North-western South China Sea[J].Chinese Journal of Oceanologyand Limnology,2008,25(4):250-259.
[12]吴时国,董冬冬,杨胜雄等,南海北部陆坡细粒沉积物天然气水合物系统的形成模式初探[J].地球物理学报,2009,52(7):1849-1857.[WU Shiguo,DONG Dongdong,YANGShengxiong,et al.Genetic model of the hydrate system inthe fine grain sediments in the northern continental slope ofthe South China Sea[J].Chinese J.Geophys,2009,52(7):1849-1857.]
[13]Xie Xinong,Muller R D,Ren J Y,et al.Stratigraphic archi-tecture and evolution of the continental slope system in off-shore Hainan,northern South China Sea[J].Marine Geolo-gy,2008,247:129-144.
[14]王秀娟,吴时国,董冬冬,等.琼东南盆地块体搬运体系对天然气水合物形成的控制作用[J].海洋地质与第四纪地质,2011,31(1):109-118.[WANG Xiujuan,WU Shiguo,DONG Dongdong,et al.Control of Mass transport depositsover the occurrence of gas hydrate in Qiongdongnan Basin[J].Marine Geology and Quaternary Geology,2011,31(1):109-118.]
[15]吴时国,孙启良,吴拓宇,等.琼东南盆地深水区多边形断层的发现及其油气意义[J].石油学报,2009,30(1):22-26.[WU Shiguo,SUN Qiliang,WU Tuoyu,et al.Polygonalfault and oil-gas accumulation in deep-water area of Qiong-dongnan Basin[J].Acta Petrolei Sinica,2009,30(1):22-26.]
[16]Alves T M,Cartwright J.Volume balance of a submarinelandslide in the Espirito Santo Basin,offshore Brazil:Quan-tifying seafloor erosion,sediment accumulation and depletion[J].Earth and Planetary Science Letters,2009,288:572-580.
[17]吴时国,秦志亮,王大伟,等.南海北部陆坡块体搬运沉积体系的地震响应与成因机制[J].地球物理学报,2011,54(12):1-12.[WU Shiguo,QIN Zhiliang,WANG Dawei,etal.Seismic characteristics and triggering mechanism analysisof mass transport deposits in the northern continental slopeof the South China Sea[J].Chinese Journal of Geophysics,2011,54(12):1-12.]
[18]Pirmez C,Marr J,Shipp C,et al.Observations and numericalmodeling of debries flows in the Na Kika Basin,Gulf ofMexico[J].Annual Offshore Technology Conference,2004,Paper OTC 16749,13p.
[19]Schwab W C,Lee H J,Twichell D C.Submarine landslides:selected studies in the U.S.exclusive economic Zones[J].U.S.Geological Survey Bulletin,1993:193-204.
[20]Hampton M A,Lee H J and Locat J.Submarine landslides[J].Review of Geophysics,2006,35:33-59.
[21]Weimer P.Sequence stratigraphy,seismic geometries,anddepositional history of the Mississippi Fan,deep Gulf ofMexico[J].AAPG Bulletin,1990,74:425-453.
[22]黄维,汪品先.南海沉积物总量的统计:方法与结果[J].地球科学进展,2006(5):465-473.[HUANG Wei,WANGPinxian.The statistics of sediment mass in the South ChinaSea:method and result[J].Advance in Earth Science,2006,21(5):465-473.]
[23]王大伟,吴时国,董冬冬等.琼东南盆地第四纪块体搬运体系的地震特征[J].海洋地质与第四纪地质,2009,29(3):69-74.[WANG Dawei,WU Shiguo,DONG Dongdong,etal.Seismic characteristics of Quaternary mass transport de-posits in Qiongdongnan basin[J].Marine Geology and Qua-ternary Geology,2009,29(3):69-74.]
[24]Sun Q,Wu S,Luedmann T,et al.Geophysical evidence forcyclic sediment deposition on the southern slope of Qiong-dongnan Basin,South China Sea[J].Marine GeophysicalResearch,2011,32(3):415-428.
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