北部湾盆地晚中新世以来沉降过程
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摘要
根据近年在北部湾盆地内采集的3 000km高分辨率多道地震剖面数据,对研究区的主要沉积界面和地层层序进行了解释和划分,得到了3套主要地层的厚度图,通过对主要地层厚度图的比较分析,发现中新世晚期—上新世—更新世—全新世以来,盆地内沉积中心经历了从涠西南凹陷—海中凹陷—海头北凹陷的迁移过程,从而揭示了北部湾盆地内的不均匀沉降,且其相对快速沉降区域经历了大致从北往南的迁移。
Based on the 3000km of high resolution multichannel seismic profile data recently acquaired from the Beibuwan Basin,three sets of strata were identified and contoured respectively according to major sedimentary interfaces and stratigraphic sequences.Isopach map of the strata shows that the depositional center of the basin gradually moved from the Weixinan Depression to Haizhong Depression and then to Haitoubei Depression in the period from Late Miocene to Holocene.It suggests an nonununiform subsidence in the Beibuwan basin and the shifting of the major subsidence area from north to south.
Based on the 3000km of high resolution multichannel seismic profile data recently acquaired from the Beibuwan Basin,three sets of strata were identified and contoured respectively according to major sedimentary interfaces and stratigraphic sequences.Isopach map of the strata shows that the depositional center of the basin gradually moved from the Weixinan Depression to Haizhong Depression and then to Haitoubei Depression in the period from Late Miocene to Holocene.It suggests an nonununiform subsidence in the Beibuwan basin and the shifting of the major subsidence area from north to south.
引文
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[3]邱燕,曾维军,李唐根.南海中、南部断裂体系及其大地构造意义[J].大地构造与成矿学,2005,29(2):166-175.[QIUYan,ZENG Weijun,LI Tanggen.Fracture systems and theirtectonic significance in the central and southern parts of theSouth China Sea[J].Geotectonica et Metallogenta,2005,29(2):166-175.]
[4]龚再升,李思田.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社,1997:86-92.[GONG Zaisheng,LI Sitian.Analysis of Oil and Gas Accumulation in the Northern Conti-nental Margin Basin of the South China Sea[M].Beijing:Sci-ence Press,1997:86-92.]
[5]万天丰.中国大地构造学纲要[M].北京:地质出版社,2004:173-203.[WAN Tianfeng.Outline of Chinese Earth Tectonics[M].Beijing:Geological Publishing House,1997:86-92.]
[6]杜振川.南海北部湾盆地构造特征及对沉积的控制作用[J].河北建筑科技学院学报,1997(1):55-59.[DU Zhenchuan.Struc-tural features and the controlling function of sedimentary fromtertiary in Beibuwan basin the South China Sea[J].Journal ofHebei Institute of Architectural Science&Technology,1997(1):55-59.]
[7]金庆焕,陈邦彦,吴进民.南海地质与油气资源[M].北京:地质出版社,1989:345.[JIN Qinghuan,CHEN Bangyan,WU Jin-min.Geolagy and Hydrocarbon Resources in the South ChinaSea[M].Beijing:Geological Publishing House,1989:345.]
[8]姚伯初.南海海盆新生代的构造演化史[J].海洋地质与第四纪地质,1996,16(2):1-13.[YAO Bochu.Tectonic evolutionof the South China Sea in Cenozoic[J].Marine Geology andQuaternary Geology,1996,16(2):1-13.]
[9]姚伯初,邱燕.南海西部海域地质构造特征和新生代沉积[M].北京:地质出版社,1999:36-54.[YAO Bochu,QIU Yan.Geo-logical Tectonic Characters and Cenozoic Sedimentary of theWestern South China Sea[M].Beijing:Geological PublishingHouse,1999:36-54.]
[10]张启明.北部湾盆地石油地质[J].海洋地质与第四纪地质,1989,9(3):73-81.[ZHANG Qiming.Petroleum geology ofthe Beibu Gulf Basin[J].Marine Geology and QuaternaryGeology,1989,9(3):73-81.]
[11]Li Jinchen,Pan Hua,Chen Wenbin.Research on the seis-motectonic setting in Beibu Gulf waters[J].Earthquake Re-search in China,2010,24(2):264-271.
[12]徐黎明,周立发,张义楷.鄂尔多斯盆地构造应力场特征及其构造背景[J].大地构造与成矿学,2006,30(4):455-462.[XU Liming,ZHOU Lifa,ZHANG Yikai.Characteristics andtectonic setting of tectono-stress field of Ordos Basin[J].Geo-tectonica et Metallogenta,2006,30(4):455-462.]
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