渤海海域新近纪—第四纪断裂特征及形成机制  

Neogene-Quaternary fault characteristics and its formation mechanism in Bohai Sea

作　　者：万桂梅[1,2] 汤良杰[1,2] 周心怀[3] 金文正[4,5] 陈绪云[6] 

机构地区：[1]中国石油大学盆地与油藏研究中心,北京102249 [2]中国石油大学油气资源与探测国家重点实验室,北京102249 [3]中国海洋石油有限公司天津分公司,天津300452 [4]中国地质大学能源学院,北京100083 [5]中国地质大学海相储层演化与油气富集机理教育部重点实验室,北京100083 [6]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011

出　　处：《石油学报》2010年第4期591-595,共5页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.40972090和No.40672143);中国海洋石油总公司科技项目(SC06TJ-TQL-004)联合资助

摘　　要：渤海海域是郯庐断裂带所经之地,该区断裂的形成与郯庐断裂的走滑作用密切相关。新近纪及后期郯庐断裂发生右行走滑作用,张家口-蓬莱断裂发生共轭左行走滑,分别控制了莱州湾-渤中-辽东湾地区和渤西地区浅层小断裂的形成,小断裂主要沿着走滑断裂两侧分布,走向有NE、NEE、近EW向和NWW向,以NE和NEE走向为主,断裂错综复杂。这些小断裂平面上大部分表现为反"S"型,剖面上大部分表现为花状构造。其形成机制为可以用持续简单剪切的作用下非共轴递进变形来解释,早期形成的NE向正断层在后期持续简单剪切作用下发生旋转,呈NEE向,并带有一定的左行走滑位移分量,简单剪切持续进行断层还可能发生正反转形成NWW向扭压断层。所以,渤海海域新近纪是在持续简单剪切作用下形成走滑断层体系。Bohai Sea was traversed by the Tanlu fault belt,and the formation of faults in Bohai Sea is relative to the strike-slip of Tanlu fault belt.The dextral slip of Tanlu fault and the conjugated sinistral slip of the Zhangjiakou-Penglai fault have occurred since the Eogene period.The two faults respectively controlled the formation of small faults in Laizhou Bay to Middle Bohai Sea to Liaodong Bay areas and the western Bohai Sea.The small faults mainly distributed along the strike slip faults and had the strikes of NE,NEE,EW and NWW directions,among them,the NE and NEE directions are the main strikes.These small faults mainly took on the shape as reverse ＂S＂ in plane and as ＂flower＂ in profile.The formation mechanism of these phenomena can be explained by the non-co-axial progressive deformation.Under the action of late continuous simple shear,the normal fault with NE direction developed in the early stage could rotate and form the NEE strike fault with a certain sinistral slip displacement.At the same time,the NEE strike fault could rotate and reserve as a NWW strike fault.So,the complicated strike-slip fault system was generated in Bohai Sea during the Neogene period and Quaternary period under the action of the non-co-axial progressive deformation.

关 键 词：渤海海域 新近纪 断裂特征 形成机制 非共轴递进变形 

分 类 号：TE111.12[石油与天然气工程—油气勘探]