南海北部深水西区中中新世混合沉积模式及控制因素
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摘要
以新采集的地震资料为基础,对南海北部深水西区的混合沉积作了初步研究。混合沉积在地震剖面上表现为平行—亚平行,振幅强—中,频率中等及连续性中等的反射特征。混合沉积分布在研究区地震资料覆盖范围的西北角,发育规模较大,最大长度达44.7km,最大宽度33.2km,面积1084km2,最大厚度为138m,纵向上分布在中中新统梅山组。综合南海北部构造演化、地震勘探等研究成果,建立了混合沉积模式。该混合沉积分布于半深海沉积区,由其南东东方向的西沙—广乐台地提供碳酸盐岩碎屑(同时也提供部分硅质碎屑),由其西侧的中南半岛提供主要的硅质碎屑。在南海北部深水西区,控制混合沉积分布的主要因素为构造作用(包括海平面变化)、物源供给及水动力条件等三个方面,这三者之间又具有密切的内在联系。
Mixed sediments mean the mixed sedimentary carbonate clast and siliceous clast,which are common in modern and ancient sediments. Based on the new seismic data,elementary study is finished to mixed sediments in west deepwater area,Northern South China Sea. The mixed sediments have some reflection features such as parallel-subparallel,medium-strong amplitudes,medium frequency and medium continuity on seismic profiles. The according area of mixed sediments that lies in the northwest of seismic area develop in a relatively wide range with an area of 1,084km2 and up to 138m of vertical thickness in middle Miocene Meishan Formation. A model of mixed sediments is set up based on the tectonic evaluation and seismic exploration in northern South China Sea. These mixed sediments that lie in the semi-deepwater area derive from carbonate clast and parts of siliceous clast,which are provided by Xisha-Guangle Terrace on the east-southeast,and siliceous clast,which are supplied by Indochina peninsula on the west. The main factors controlling the mixed sediments are tectonic action (including changes of sea levels),source supply and hydrodynamic condition,which are closely relative each other.
Mixed sediments mean the mixed sedimentary carbonate clast and siliceous clast,which are common in modern and ancient sediments. Based on the new seismic data,elementary study is finished to mixed sediments in west deepwater area,Northern South China Sea. The mixed sediments have some reflection features such as parallel-subparallel,medium-strong amplitudes,medium frequency and medium continuity on seismic profiles. The according area of mixed sediments that lies in the northwest of seismic area develop in a relatively wide range with an area of 1,084km2 and up to 138m of vertical thickness in middle Miocene Meishan Formation. A model of mixed sediments is set up based on the tectonic evaluation and seismic exploration in northern South China Sea. These mixed sediments that lie in the semi-deepwater area derive from carbonate clast and parts of siliceous clast,which are provided by Xisha-Guangle Terrace on the east-southeast,and siliceous clast,which are supplied by Indochina peninsula on the west. The main factors controlling the mixed sediments are tectonic action (including changes of sea levels),source supply and hydrodynamic condition,which are closely relative each other.
引文
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[20]姚根顺,袁圣强,吴时国,等.琼东南盆地深水区双物源沉积模式及勘探前景[J].石油勘探与开发,2008,35(6):685-691
[21]Fyhn M B W,Nielsen L H,Boldreel L O,et al.Geological evolution,regional perspectives and hydrocarbon potential of the northwest Phu Khanh Basin,offshore Central Vietnam[J].Marine and Petroleum Geology,2009,26:1-24.
[2]罗顺社,刘魁元,何幼斌.渤南洼陷沙四段陆源碎屑与碳酸盐混合沉积特征与模式[J].江汉石油学院学报,2004,26(4):19-21.
[3]张宁生,任晓娟,魏金星,等.柴达木盆地南翼山混积岩储层岩石类型及其与油气分布的关系[J].石油学报,2006,27(1):42-46.
[4]王国忠.南海北部大陆架现代礁源碳酸盐与陆源碎屑的混合沉积作用[J].古地理学报,2001,3(2):47-54.
[5]Mount J F.Mixing of siliciclastic and carbonate sediments in shallow shelf environments[J].Geology,1984,12:432-435.
[6]Mount J F.Mixed siliciclastic and carbonate sediments:a pro-posed first-order textural and compositional classification[J].Sedimentology,1985,32:435-442.
[7]王国忠,吕炳全,全松青.现代碳酸盐和陆源碎屑的混合沉积作用——涸洲岛珊瑚岸礁实例[J].石油天然气地质,1987,8(1):15-28.
[8]杨朝青,沙庆安.云南曲靖中泥盆统曲靖组的沉积环境:一种陆源碎屑与海相碳酸盐的混合沉积[J].沉积学报,1990,8(2):59-66.
[9]Flavio S A.Acoustic properties of Neogene carbonates and siliciclastics from the subsurface of the Florida Keys:Implications for seismic reflectivity[J].Marine Geology,1997,144:9-31.
[10]张雄华.混积岩的分类和成因[J].地质科技情报,2000,19(4)31-35.
[11]沙庆安.混合沉积和混积岩的讨论[J].古地理学报,2001,3(3):63-67.
[12]郭福生,严兆彬,杜杨松.混合沉积混积岩和混积层系的讨论[J].地学前缘,2003,10(3):68
[13]Kevin J C,Stanley D L,Albert C,et al.Interplay of late Ceno-zoic siliciclastic supply and carbonate response on the southeastFlorida platform[J].Journal of Sedimentary Research,2003,73(1):31-46.
[14]Orpin A R,Brunskill G J,Zagorskis I,et al.Patterns of mixed siliciclastic-carbonate sedimentation adjacent to a large dry-tropics river on the central Great Barrier Reef Shelf,Australia[J].Australian Journal of Earth Sciences,2004,51:665-683.
[15]郭士明,刘立.大港滩海区沙一段下部混积岩成岩作用研究[J].断块油气田,2006,13(5):20-23.
[16]董桂玉,何幼斌,陈洪德.惠民凹陷沙一中湖相碳酸盐与陆源碎屑混合沉积—以山东商河地区为例[J].沉积学报,2007,25(3):343-348.
[17]陶维祥,赵志刚,何仕斌,等.南海北部深水西区石油地质特征及勘探前景[J].地球学报,2005,26(4):359-364.
[18]魏魁生,崔旱云,叶淑芬.琼东南盆地高精度层序地层学研究[J].地球科学:中国地质大学学报,2001,26(1):59-66.
[19]马玉波,吴时国,许建隆,等.琼东南盆地南部深水凹陷生物礁及碳酸盐岩台地发育模式[J].天然气地球科学,2009,20(1):119-124.
[20]姚根顺,袁圣强,吴时国,等.琼东南盆地深水区双物源沉积模式及勘探前景[J].石油勘探与开发,2008,35(6):685-691
[21]Fyhn M B W,Nielsen L H,Boldreel L O,et al.Geological evolution,regional perspectives and hydrocarbon potential of the northwest Phu Khanh Basin,offshore Central Vietnam[J].Marine and Petroleum Geology,2009,26:1-24.
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