苏北盆地高邮凹陷隐蔽性断层构造特征分析与预测  

Structural characteristics and prediction of the concealed faults in the Gaoyou Sag of Subei Basin

作　　者：姜芹芹 周绍荣 朱光[2] 谢成龙[2] 王岩生 吴进飞 

机构地区：[1]淮安市地质矿产勘查院,江苏淮安223001 [2]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《地质学刊》2016年第1期37-46,共10页Journal of Geology

基　　金：国家自然科学基金重大研究计划(91214301);江苏油田项目共同资助

摘　　要：晚白垩世晚期—新生代发育的高邮凹陷,是苏北盆地南部典型富含油气的半地堑式断陷盆地,自南向北分为南断阶、深凹带与北斜坡。该凹陷复杂断裂构造系统与相应的沉积格局受印支期NEE向逆冲基底断层系与晚侏罗世伊泽纳崎板块高速斜向俯冲形成的NNE向左行平移基底断层系影响,同时受古近纪期间区域近SN向拉张应力状态控制。北斜坡东部花瓦构造带主体EW向正断层与NNE向隐蔽性断层发育了限制型、连接型、复合型3类隐蔽性断块圈闭模式,同时在平面上形成多种组合样式。通过研究花瓦区隐蔽性断块圈闭实例与有限差分法数值模拟,分析总结出高邮凹陷NNE向隐蔽性断层的成因机制与构造特征,并推断了5条隐蔽性断层发育带。The Gaoyou Sag, developed in the late period of Late Cretaceous to Cenozoic, is a typical half-graben faulted basin rich in oil and gas resources in the south of the Subei Basin. This sag can be divided into the southern fault step zone, deep sag zone and northern slope zone from south to north. The complex fault system and corresponding sedimentary framework of the Gaoyou Sag are re- stricted by two sets of basement fault systems, i.e., the Indosinian NEE-trending thrusts and NNE-trending, sinistral faults resuhed from the Late Jurassic high-speed oblique subduction of the Izanagi Plate, and are also influenced by regional Paleogene extensional stress field with N-S extension. The concealed fault-blocked traps formed by the major EW-trending normal faults and the NNE-trending concealed faults in the Huawa zone in the east of the northern slope zone can be divided into three types ： limitative trap, connective trap and compound trap. In addition, there are many trap assemblage patterns in the plane of the sag. Based on example analysis of the concealed fault-block traps in the Huawa zone and numerical simulation using the finite difference method, the paper summarized the formation mechanism and structural characteristics of the NNE-trending concealed faults in the Gaoyou Sag, and inferred five developmerit zones of concealed faults.

关 键 词：基底断层 斜向拉伸 隐蔽性断层 断块圈闭 高邮凹陷 苏北盆地 江苏 

分 类 号：P618.130.22[天文地球—矿床学]