摘要
利用三维地震构造解释成果,结合钻井资料对青东凹陷古近系断层几何学特征进行了详细的分析,认为研究区主要发育有同沉积断层、后期正断层和基底走滑断层3种类型,平面上以近EW向、近NW向和近NE向3组方向展布,在数量上以近EW向最多,其次为近NW向,近NE向最少。按照主干断层和次级断层的组合形态,剖面上可划分为Y型、复合Y型、马尾状、多米诺骨牌式、梳状、卷心菜型等6种样式;平面上划分出平行断层系、斜交断层系和雁列断层系等3种形式。在分析区内断层的形成发育的基础上,进一步查明了区内断层在油气生成至成藏过程中的作用,主干断层活动控制了该区的盆地构造格局、沉积以及烃源岩展布;断层空间展布形态及组合构造样式控制了圈闭的类型,同时也组成了复杂的三维输导网络,为油气的垂向运聚成藏提供了有效通道。受断层控制形成的北部次凸和南部次凸构造高区域是油气垂向运移的有利指向区。
By using the results of 3Dseismic profile interpretation and combined with the drilling data,the geometry characteristics of fault in Paleogene System were analyzed in detail.The result showed that three main fault types were developed in the study area,including synsedimentary fault types,normal fault types and basement strike-slip fault types.In the plane,the most of faults were distributed nearly in EW,NW and NE directions.In number,the fault of EW was the most,and the fault of NE was the least.According to the combination of the major fault and the sub-fault,the faults were divided into 6types in profile,such as Y type,complex Y type,horsetail shape,dominoes type,pectinate type and cabbage type and 3kinds of systems in plane,such as parallel fault system,oblique fault system and echelon fault system.Based on the analysis of the fault development,the function in the oil and gas generation and accumulation process was clarified.The study shows that the activity of major fault controls the tectonic framework of basin and the distribution of sedimentary and hydrocarbon source rock.The fault distribution in space and tectonic combination style control the types of trap,the faulted anticline,fault block and fault nose traps are the main types.These faults also form a complex three-dimensional conducting network,it provides effective channels for vertical transport of oil and gas accumulation.The northern and southern convex structure areas controlled by the fault formation are the favorable areas of vertical migration of oil and gas.
出处
《石油天然气学报》
CAS
CSCD
2014年第11期28-35,5,共8页
Journal of Oil and Gas Technology
基金
国家科技重大专项(2011ZX05023-002-005)
关键词
青东凹陷
古近系
断层特征
成藏控制作用
Qingdong Sag
Paleogene
fault feature
hydrocarbon accumulation
