垦东—埕岛构造带古近纪断层活动特征  

Features of Paleogene fault activity in the Kendong-Chengdao structural belt

作　　者：马立驰[1] 王永诗[1] 杨贵丽[1] 

机构地区：[1]中国石化胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2015年第3期42-46,51,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"济阳坳陷油气富集机制与增储领域"(2011ZX05006-003);中国石化科技攻关项目"胜利滩海北西向构造带古近系油气成藏规律"(P13018)

摘　　要：垦东—埕岛构造带是济阳坳陷东北部重要的富油气带,通过对该区古近纪应力场和断层活动特征进行分析,明确了各个断层的形成机制,从而理清了各个凸起的形成原因和彼此之间的关系。研究结果表明,研究区存在北西向、北东东向与北北东向3组前新生代基底断层,前两者为中三叠世印支期前陆变形中形成的逆冲断层,而后者为晚侏罗世郯庐断裂带平移伴生的左行平移断层。在古近纪南北向区域拉张过程中,研究区北西向基底断层为左行张扭性复活,而北北东向基底断层为右行张扭性复活。至新生代,在南北向拉张应力作用下,新生断层表现为近东西向。在多期构造活动下,多方位断层使该构造带上的各个凸起呈现为张扭性的半地垒构造,它们共同复合构成了垦东—埕岛构造带。The Kendo-Chengdao structural belt is an important hydrocarbon-bearing belt in the northeast of the Jiyang depression. The formation mechanism of individual fault was determined through analyzing Paleogene stress field characteristics and fault activity features,thus the reasons for the formation of uplifts and their relationship were clarified. The results show that three series of pre-Cenozoic basement faults developed striking NW,NEE and NNE respectively in the area.The first two are thrust faults generating at middle Triassic-Indo during pre-continent deformation,while the last one is the strike-left-slip fault accompanying with Tan-Lu Fault System translation at the late Jurassic. During the regional tension in south and north at Paleogene in the area,the basement faults striking NW moved again in left-tensional-shear,while the basement fault striking NNE moved again in right-tensional-shear. To the Cenozoic,the new generating faults striking nearly WE developed under the force of tensile stress in the south and north. The uplifts are characterized by tension-torsional half horst structure resulted from multiple activities of multi-faceted fault,which constitute together a composite KendongChengdao structural belt.

关 键 词：基底断层 复活方式 张扭性活动 古近纪 垦东-埕岛构造带 

分 类 号：P315.2[天文地球—地震学]