海安凹陷上白垩统—新生界断裂形成及演化
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摘要
根据近年来在海安凹陷获得的地震资料,对上白垩统—新生界内部断裂特征进行了研究。海安凹陷断层展布为北东向、北东东向和北西西或近东西向。主断层不同段走向不同,深浅层结构不同,控制凹陷结构;次级断层多受主断层控制,其形成和走向受主断层影响。断层活动表现出旋回性特点,控制着盆地结构的旋回性演化。断层展布反映泰州组—阜宁组沉积期间断层为北西—南东向的伸展作用,同时又表现出受右旋扭动的影响;三垛组沉积早期为伸展性断层发育时期,伸展方向为北西—南东向;三垛组沉积晚期,受近东西向挤压,一些断层表现出走滑特点;新近纪早期,断裂继承性活动,晚期主要沿主断裂活动。这种构造应力场的变化与板块运动的改变有关。
Base on the seismic data acquired in recent years in Haian Depression,the internal fracture characteristics from the Upper Cretaceous to Cenozoic have been studied. The facture extending direction of the Haian Depression is NE,NEE and NWW or approximately EW. The main fault has different strike in different segments,the structures are different in the deep and the shallow,and the main fault controls the depression structure,the secondary faults are generally controlled by main fault,and their formation and strike are affected by main fault as well. The fault activities show cycle feature,they control cycle evolution of the basin structure. The fault distribution reflects its NW-SE extension during Taizhou-Funing formation Sedimentation and meanwhile the distribution is shown affected by dextral twist,the early sediment period for the Sanduo formation was extending fault development period,its extending direction is NW-SE,in Sanduo sediment late period,due to compression from approximately EW some faults show strike-slip feature. In early Cenozoic the faults acted succeedingly,in late Cenozoic the faults acted along the main fault. The change in tectonic stress field is related to the change of plate movement.
Base on the seismic data acquired in recent years in Haian Depression,the internal fracture characteristics from the Upper Cretaceous to Cenozoic have been studied. The facture extending direction of the Haian Depression is NE,NEE and NWW or approximately EW. The main fault has different strike in different segments,the structures are different in the deep and the shallow,and the main fault controls the depression structure,the secondary faults are generally controlled by main fault,and their formation and strike are affected by main fault as well. The fault activities show cycle feature,they control cycle evolution of the basin structure. The fault distribution reflects its NW-SE extension during Taizhou-Funing formation Sedimentation and meanwhile the distribution is shown affected by dextral twist,the early sediment period for the Sanduo formation was extending fault development period,its extending direction is NW-SE,in Sanduo sediment late period,due to compression from approximately EW some faults show strike-slip feature. In early Cenozoic the faults acted succeedingly,in late Cenozoic the faults acted along the main fault. The change in tectonic stress field is related to the change of plate movement.
引文
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[3]王巍,陈高,王家林等.苏北—南黄海盆地区域构造特征分析.地震学刊,1999,1:47~55
[4]陈安定.苏北箕状断陷形成的动力学机制.高校地质学报,2001,7(4):408~418
[5]邱旭明.扭动作用在苏北盆地构造体系中的表现及其意义.江汉石油学院学报,2002,24(2):5~7
[6]邱旭明.苏北盆地扭动构造油气藏.石油勘探与开发,2004,31(3):26~29
[7]刘玉瑞,刘启东,杨小兰.苏北盆地走滑断层特征与油气聚集关系.石油与天然气地质,2004,25(3):279~283
[8]陈勇,刘宏宇.海安凹陷走滑构造特征及其对油气聚集的影响.胜利油田职工大学学报,2005,19(5):49~51
[9]陈莉琼.苏北盆地形成演化与油气成藏关系研究.石油天然气学报(江汉石油学院学报),2006,28(4):180~181
[10]邱海峻,许志琴,乔德武.苏北盆地构造演化研究进展.地质通报,2006,25(9-10):1117~1120
[11]马立桥,陈汉林,董庸等.苏北—南黄海南部叠合盆地构造演化与海相油气勘探潜力.石油与天然气地质,2007,28(1):35~42
[12]曾萍.G78区域大剖面综合解释与苏北盆地构造特征.石油天然气学报(江汉石油学院学报),2007,29(3):82~86
[13]刘玉瑞,王建.苏北盆地复杂断块油气藏勘探及技术.江苏地质,2003,27(4)193~198
[14]陆英.海安凹陷油气成藏的主控因素研究.小型油气藏,2006,11(4):15~18
[15]朱夏.论中国含油气盆地构造.北京:石油工业出版社,1986,132
[16]Hendrix M S et al.Sedi mentary record and cli matic i mplications of recurrent deformation in the Tian Shan:Evidence from Mesozoic strata of the north Ta-ri m,South Junggar,and Turpan basins,Northwest China.Geological Society of American Bulletin,1992,104:53~79
[17]GrahamS A,Hendrix MS,and Wang L B.Collision successor basin of Western China:I mpact of tectonic inheritance on sand composition.Geological Society of American Bulletin,1993,105:323~324
[18]Lee T Yand Lawver L A.Cenozoic plate reconstruc-tion of southeast Asia.Tectonophysics,1995,251:85~138
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