东海陆架盆地新生界结构特征及迁移规律
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摘要
通过对东海陆架盆地新生界地质结构特征及迁移规律研究,认为新生界盆地地质结构在平面上具有"早期南北分块、晚期东西分带"的特征;剖面上在西部主要表现为"东断西超"的箕状断陷结构,东部为双层结构,T03反射地震界面之下为地堑式结构,之上为"东断西超"的箕状结构。由于西部坳陷带箕状断陷结构之下的中生界也具双断结构,因此这种双层结构在盆地内部具有自西向东的迁移规律,这在整个东海地区的盆地中表现也较为明显。除此之外,盆内断裂、岩浆活动期次西早东晚,主要沉积地层西老东新,均表现出自西向东的迁移特征。盆地东界断裂控制沉积,盆地发生掀斜运动致使其西侧抬升剥蚀,成盆期(晚中生代)的原始西界已被剥蚀而向东缩移,盆地向东迁移至现今位置。
Through research of characteristics of Cenozoic structure and migration rules of the East China Sea Shelf Basin,it was considered that the planar structure of the Caenozoic basin had the characteristics of being blocked from south to north at the early stage and belted from west to east at the late stage.The characteristics of the section structure were obvious,the west depression belt was a half-graben basin with the eastern steep slope zone and the western slope zone;the east depression belt represented two-layer structure,below the T03 seismic interface there was a graben basin,while above it there was a half-graben basin.Because of the existence of double-fault structure in the Mesozoic of western depression,this two-layer structure had a rule of migration from the west to the east,it existed in the basin of the whole Donghai Area.Besides,the stage of magmatic and fault activities in the basin was early in the west and late in the east,the main strata included that the west part was older and the east part was younger,they all presented the characteristics of migration from the west to the east in the basin.The east boundary fault of basin controls the deposition,fault tilting movement results in the uplift-erosion in the west part of the basin.The original west boundary of basin period(late Mesozoic) has experienced erosion and eastward migration,and the basin has been migration to present position.
Through research of characteristics of Cenozoic structure and migration rules of the East China Sea Shelf Basin,it was considered that the planar structure of the Caenozoic basin had the characteristics of being blocked from south to north at the early stage and belted from west to east at the late stage.The characteristics of the section structure were obvious,the west depression belt was a half-graben basin with the eastern steep slope zone and the western slope zone;the east depression belt represented two-layer structure,below the T03 seismic interface there was a graben basin,while above it there was a half-graben basin.Because of the existence of double-fault structure in the Mesozoic of western depression,this two-layer structure had a rule of migration from the west to the east,it existed in the basin of the whole Donghai Area.Besides,the stage of magmatic and fault activities in the basin was early in the west and late in the east,the main strata included that the west part was older and the east part was younger,they all presented the characteristics of migration from the west to the east in the basin.The east boundary fault of basin controls the deposition,fault tilting movement results in the uplift-erosion in the west part of the basin.The original west boundary of basin period(late Mesozoic) has experienced erosion and eastward migration,and the basin has been migration to present position.
引文
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[3]宋小勇.东海盆地西湖凹陷构造样式及其对油气聚集的控制[D].北京:中国地质大学(北京),2007.
[4]刘申叔,李上卿.东海油气与地球物理勘探[M].北京:地质出版社,2001.61～65.
[5]刘建华,吴健生,方银霞,等.东海陆架盆地的前新生界[J].海洋学报,2007,29(1):66～75.
[6]杨香华,李安春.东海大陆边缘基底性质与沉积盆地[J].中国海上油气(地质),2003,17(1):25～28.
[7]赵艳秋.东海陆架盆地长江凹陷生油岩研究[J].海洋石油,2003,23(增刊):40～44.
[8]张建培,张涛,刘景彦,等.西湖凹陷反转构造分布与样式[J].海洋石油,2008,28(4):14～20.
[9]Jackson J A,McKenzie D P.The geometrical evolution of normal fault systems[J].Journal of Structure Geology,1983,(5):471～482.
[10]Wemicke B P,Axen G J.On the role of isostasy in the evolution of normal fault systems[J].Geology,1988,16:848～851.
[11]漆家福,杨桥.伸展盆地的结构形态及其主控动力学因素[J].石油与天然气地质,2007,28(5):634～640.
[12]贾成业,夏斌,王核,等.东海陆架盆地丽水凹陷构造演化及油气地质分析[J].天然气地质科学,2006,17(3):397～401.
[13]夏斌,张敏强,万志峰,等.东海丽水椒江凹陷构造样式与含油气远景[J].华南地震,2007,27(3):1～8.
[14]李上卿.东海西湖凹陷新生代地质构造特征与演化[J].海洋石油,2000,20(2):8～14.
[15]王锋,朱文斌,胡德昭,等.东海盆地长江坳陷新生代反转构造研究[J].大地构造与成矿学,2005,29(2):176～181.
[16]王国纯.东海盆地地质特征与油气富集有利地区探讨[J].石油实验地质,1987,9(1):42～48.
[17]高乐.东海陆架中生代残余盆地特征及勘探方向探讨[J].中国海上油气,2005,17(3):148～152.
[18]冯晓杰,蔡东升,王春修,等.东海陆架盆地中新生代构造演化特征[J].中国海上油气,2003,17(1):33～37.
[19]赵金海,东海中.新生代盆地成因机制和演化(上)[J].海洋石油,2004,24(4):6～14.
[20]金翔龙,喻普之.冲绳海槽的构造特征与演化[J].中国科学,1987,B(2):196～203.
[21]李乃胜.冲绳海槽断裂构造的研究[J].海洋与湖沼,1988,19(4):347～358.
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