珠江口盆地白云凹陷陆坡区10.5Ma以来的沉积体系
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摘要
通过对珠江口盆地白云凹陷陆坡区10.5Ma以来的地震相分析,共识别出席状平行亚平行地震相、透镜状前积地震相、深切河谷地震相、帚状地震相和杂乱地震相,不同的地震相分别代表不同的沉积体系类型。综合所识别的地震相类型,分析了陆架边缘下切谷、浊积扇和陆架边缘三角洲3种主要的沉积体系及其配置关系。物源供给是影响陆坡区沉积体系发育的最重要因素,是沉积体系发育的物质基础,海平面变化和构造运动为沉积体系发育提供了可容纳空间,3种影响因素共同影响了陆坡区沉积体系的发育。
Five seismic facies were identified including parallel or sub-parallel seismic facies,lenticular foreset seismic facies,incised-valley seismic facies,brush-shaped seismic facies and chaotic seismic facies through the seismic facies analysis of Baiyun depression in the Pearl River Mouth basin since 10.5 Ma and each of them standed for different kinds of depositional systems.Ulteriorly the chief depositional systems and their setup relation were analysed including shelf-margin incised-valley,turbidite fans and shelf-margin delta.At last we think the main influential factors are sediment supply,sea level change and tectonic movement.Sediment supply was the most important factor to influence depositional system upgrowth,which was the substance base.Sea level change and tectonic movement provided accommodation space for depositional system upgrowth.
Five seismic facies were identified including parallel or sub-parallel seismic facies,lenticular foreset seismic facies,incised-valley seismic facies,brush-shaped seismic facies and chaotic seismic facies through the seismic facies analysis of Baiyun depression in the Pearl River Mouth basin since 10.5 Ma and each of them standed for different kinds of depositional systems.Ulteriorly the chief depositional systems and their setup relation were analysed including shelf-margin incised-valley,turbidite fans and shelf-margin delta.At last we think the main influential factors are sediment supply,sea level change and tectonic movement.Sediment supply was the most important factor to influence depositional system upgrowth,which was the substance base.Sea level change and tectonic movement provided accommodation space for depositional system upgrowth.
引文
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[3]Mitchum R MJr,Vail P R,Thomposon S.Seismic stratigraphy and global changes of sealevel,part2:the depositional sequence as a basic unit for stratigraphic analysis[C]//Payton C W,(eds).Seismic Stratigraphic Applications to Hydrocarbon Ex-ploration.AAPG Memoir,1977,26:53-62.
[4]彭大钧,庞雄,陈长民,等.从浅海陆架走向深水陆坡——南海深水扇系统的发现[J].沉积学报,2005,23(1):1-10.[PENG Da-jun,PANG Xiong,CHEN Chang-min,et al.Fromshallow-water shelf to deep-water slope-the study on deep-water fan systems in South China Sea[J].Acta Sedimentologica Sinica,2005,23(1):1-10.]
[5]Por bski S J,Steel R J.Shelf-margin deltas:their stratigraphic significance and relation to deepwater sands[J].Earth-Science Reviews,2003,62:283-326.
[6]Winker C D.Cenozoic shelf margins,northwestern Gulf of Mexico[C]//Morad M A,Kilgore J E,Cameron Jr.D K(Eds.).Gulf Coast Ass.Geol.Societies,32nd Ann.Meeting32.Gulf Coast Ass.Geol.Societies,New Orleans,1982:427-448.
[7]姜涛,解习农,汤苏林.浊流形成条件的水动力学模拟及其在储层预测方面的作用[J].地质科技情报,2005,24(2):1-5.[JI ANG Tao,XIE Xi-nong,TANG Su-lin.Hydrodynamic sim-ulation of turbidity and its application for reservoir prediction[J].Geological Science and Technology Information,2005,24(2):1-5.]
[8]李思田,林畅松,张启明,等.南海北部大陆边缘盆地幕式裂陷的动力过程及10Ma以来的构造事件[J].科学通报,1998,43(8):797-809.[LI Si-tian,LI N Chang-song,ZHANG Qi-ming,et al.The dynamic process of episodic fault depression of the Northern South China Sea and tectonic event since10Ma[J].Chinese Science Bulletin,1998,43(8):797-809.]
[9]姜涛.莺歌海—琼东南盆地区中中新世以来低位扇体形成条件和成藏模式[D].中国地质大学(武汉).2005.[JI ANG Tao.Formation of lowstand fans and their hydrocarbon accumula-tion since middle Miocene in the Yinggehai and Qiongdongnan basins[D].China University of Geosciences(Wuhan).2005.]
[10]Van Wagoner J C,Posamentier H W.An overviewof the fun-damentals of sequence stratigraphy and key definitions[C]//Wilgus C Ket al(eds.).Sea-Level Changes-An Integrated Spproach.SEPM Special Publication,(42).Tulsa,SEPM,1988:1-58.
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