南海珠江21Ma深水扇特征及控制因素
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摘要
通过对珠江口盆地白云凹陷三维地震资料解释、钻井、测井及岩心资料的观察和描述,对21 Ma发育的深水扇特征、沉积模式及控制因素进行研究。结果表明:岩心上发育正递变层理、鲍马序列和滑塌变形等多种典型重力流构造,指示了沉积物为半深海环境下的重力流沉积;地震资料上可识别出水道、水道堤岸复合体、朵体等典型深水扇构型;21 Ma深水扇沉积模式为陆架边缘三角洲-峡谷-深水扇的沉积模式,是在珠江口盆地的构造格局、相对海平面变化、坡折带演化、断裂系统的形成及古珠江三角洲的物源供给能力等多种因素的控制和有效配置下形成的。
By interpretation of the 3D seismic data,observation and analysis of the drilling,well logging and core data from Baiyun sag in Pearl River Mouth Basin,the characteristics,sedimentary model and controlling factors of deep-water fans in 21Ma were researched.The results indicate that several kinds of gravity-flow structures are discovered in the core such as normally graded bedding,Bouma sequence and slump deformation bedding,all of which indicate a kind of gravity flow deposits in bathyal environment.In seismic profile,typical sedimentary architectures of the fans are recognized,which include channels,channel-levee complex and lobes.In 21Ma,the Baiyun sag developed the kind of shelf-margin delta-valley-submarine fan sedimentary model is mainly controlled by tectonic framework,relative sea-level changes,slope break belt evolution,formation of faults as well as the material supply of the Pearl River delta.
By interpretation of the 3D seismic data,observation and analysis of the drilling,well logging and core data from Baiyun sag in Pearl River Mouth Basin,the characteristics,sedimentary model and controlling factors of deep-water fans in 21Ma were researched.The results indicate that several kinds of gravity-flow structures are discovered in the core such as normally graded bedding,Bouma sequence and slump deformation bedding,all of which indicate a kind of gravity flow deposits in bathyal environment.In seismic profile,typical sedimentary architectures of the fans are recognized,which include channels,channel-levee complex and lobes.In 21Ma,the Baiyun sag developed the kind of shelf-margin delta-valley-submarine fan sedimentary model is mainly controlled by tectonic framework,relative sea-level changes,slope break belt evolution,formation of faults as well as the material supply of the Pearl River delta.
引文
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[12]李云,郑荣才,高博禹,等.深水扇沉积研究现状和展望:以珠江口盆地白云凹陷珠江深水扇系统为例[J].地质论评,2010,56(4):550-558.LI Yun,ZHENG Rong-cai,GAO Bo-yu,et al.Reviewsand prospects on submarine fan deposition:a case studyof Zhujiang submarine fan system in Baiyun depression,Pearl River Mouth Basin[J].Geolo Gical Review,2010,56(4):550-558.
[13]WEIMER P,SLATT R M.Petroleum geology of deepwa-ter settings[M].Tulsa:American Association of Petrole-um Geologists,2007.
[14]MUTTI E,RICCI Lucchi F.Turbidites of the northernApennines:introduction to facies analysis[J].Interna-tional Geology Review,1972,20:125-166.
[2]庞雄,陈长民,施和生,等.相对海平面变化与南海珠江深水扇的响应[J].地学前缘,2005,12(3):167-177.PANG Xiong,CHEN Chang-min,SHI He-sheng,et al.Response between relative sea-level change and the PearlRiver deep-water fan system in the South China Sea[J].Earth Science Frontiers,2005,12(3):167-177.
[3]彭大钧,庞雄,陈长民,等.从浅水陆架走向深水陆坡:南海深水扇系统的研究[J].沉积学报,2005,23(1):1-11.PENG Da-jun,PANG Xiong,CHEN Chang-min,et al.From shallow-water shelf to deep-water slope—the re-search of deepwater fan systems in South China Sea[J].Acta Sedimentologica Sinica,2005,23(1):1-11.
[4]陈长民,施和生,许仕策,等.珠江口盆地(东部)第三系油气藏形成条件[M].北京:科学出版社,2003:1-121.
[5]代一丁,庞雄.珠江口盆地珠二凹陷的石油地质特征[J].中国海上油气(地质),1999,13(3):169-180.DAI Yi-ding,PANG Xiong.Petroleum geological charac-teristics of ZhuⅡdepression,Pearl River Mouth Basin[J].China Offshore Oil and Gas(Geology),1999,13(3):169-180.
[6]朱伟林,张功成,高乐.南海北部大陆边缘盆地油气地质特征与勘探方向[J].石油学报,2008,19(1):1-9.ZHU Wei-lin,ZHANG Gong-cheng,GAO Le.Geologicalcharacteristics and exploration objectives of hydrocarbonsin the northern continental margin basin of South ChinaSea[J].Acta Petrolei Sinica,2008,19(1):1-9.
[7]庞雄,陈长民,邵磊,等.白云运动:南海北部渐新统-中新统重大地质事件及其意义[J].地质论评,2007,53(2):145-152.PANG Xiong,CHEN Chang-min,SHAO Lei,et al.Baiyun movement:a great tectonic event on the Oligocene-Miocene boundary in the northern South China Sea and itsimplications[J].Geological Review,2007,53(2):145-152.
[8]彭大钧,陈长民,庞雄,等.南海珠江口盆地深水扇系统的发现[J].石油学报,2004,25(5):17-23.PENG Da-jun,CHEN Chang-min,PANG Xiong,et al.Discovery of deep-water for system in South China Sea[J].Acta Petrolei Sinica,2004,25(5):17-23.
[9]张兴阳,罗顺社,何幼斌.沉积物重力流深水牵引流沉积组合鲍玛序列多解性探讨[J].江汉石油学院学报,2001,23(1):1-5.ZHANG Xing-yang,LUO Shun-she,HE You-bin.De-posit assemblage of gravity flow and traction current indeep water:a study of the multiple interpretation of theBouma sequence[J].Journal of Jianghan Petroleum Insti-tute,2001,23(1):1-5.
[10]MUTTI E,NORMARK W R.An integrated approach tothe study of turbidite systems[C]//WEIMER P,LINKM H.Seismic facies and sedimentary processes of sub-marine fans and turbidite systems.New York:Springer-Verlag,1991:75-106.
[11]徐强,王英民,王丹,等.南海白云凹陷深水区渐新世—中新世断阶陆架坡折沉积过程响应[J].沉积学报,2010,28(5):907-916XU Qiang,WANG Ying-min,WANG Dan,et al.Sedi-mentary responses of retreating shelf break from Oligo-cene to Miocene,in deep water area of Baiyun depres-sion,South China Sea[J].Acta Sedimentologica Sini-ca,2010,28(5):907-916.
[12]李云,郑荣才,高博禹,等.深水扇沉积研究现状和展望:以珠江口盆地白云凹陷珠江深水扇系统为例[J].地质论评,2010,56(4):550-558.LI Yun,ZHENG Rong-cai,GAO Bo-yu,et al.Reviewsand prospects on submarine fan deposition:a case studyof Zhujiang submarine fan system in Baiyun depression,Pearl River Mouth Basin[J].Geolo Gical Review,2010,56(4):550-558.
[13]WEIMER P,SLATT R M.Petroleum geology of deepwa-ter settings[M].Tulsa:American Association of Petrole-um Geologists,2007.
[14]MUTTI E,RICCI Lucchi F.Turbidites of the northernApennines:introduction to facies analysis[J].Interna-tional Geology Review,1972,20:125-166.
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