摘要
受郯庐断裂带走滑作用影响,滩海地区不同区带的演化特征具有明显差异。综合地震及海陆资料,对滩海地区断裂体系特征及走滑效应进行分析,利用物理模拟实验总结该区构造样式,建立构造演化差异性分区模式。研究结果表明:研究区发育NW向、NNE向和NE向3个方向优势断裂。NW向断裂为中生代先存断裂,新生代继承性发育并叠接左旋走滑作用;NNE向断裂为右旋走滑,NE向断裂为拉张正断裂,其走滑效应NNE向强于NW向,NW向强于NE向。研究区主要发育走滑断裂弯曲构造样式、走滑断裂释压叠接构造样式、走滑断裂增压叠接构造样式及走滑断裂尾端拉张马尾扇构造样式。滩海地区构造演化差异性从沙三段沉积时期开始,差异性原因与郯庐断裂带左旋转换为右旋的过程有关。将滩海地区划分为3个演化区带,Ⅰ区为继承断陷区,以NW向断裂控制为主;Ⅱ区为相干叠合断陷区,以NW向和NE向断裂相干叠合控制为主;Ⅲ区为走滑断陷区,以NNE向走滑断裂控制为主。
The evolution characteristics of different zones in the shallow sea area are obviously different due to the effect of Tanlu strike-slip fault. Based on the offshore and onshore seismic data,the strike-slip characteristics and their effects onthe faults in shallow sea area were analyzed. The structural styles of the area were concluded based on the physical simulation experiments,and the division pattern of differential tectonic evolution was established. The study results show thatthere are NW-trending faults,NNE-trending faults and NE-trending faults. The NW-trending faults developed during Cenozoic and remained active with characteristics of left-lateral shearing in Kainozoic. The NNE-trending faults are right-lateral shear faults,and the NE-trending faults are extensional normal faults. And the strike-slip effect of NNE fault is the strongest of the three. The strike-slip effect of NW-trending fault is stronger than that of NE-trending fault. There are fourtypes of strike-slip fault in the study area which are the bending strike-slip fault,the superimposed strike-slip fault withpressure releasing,the superimposed strike-slip fault with pressure increasing and the extensional strike-slip fault at itsend in cauda equine. Finally,the differential tectonic evolution of the shallow sea area started to appear in the depositional
period of Es3,which is due to transformation of Tanlu fault from sinistral to dextral. Meanwhile,the shallow sea area was divided into three evolutionary zones. The Ⅰ-area is an inherited faulted depression which is controlled by NW-trending faults. The Ⅱ-area is a coherent faulted depression which is controlled by NW-trending and NE-trending faults. The Ⅲ-area is a strike-slip faulted depression and it is controlled by NNE-trending faults.
作者
卢姝男
吴智平
程燕君
李旭
LU Shunan;WU Zhiping;CHENG Yanjun;LI Xu(School of Geosciences,China University of Petroleum（East China）,Qingdao City,Shandong Province,266580,China;Qingdao National Laboratory for Marine Science and Technology,Qingdao City,Shandong Province,266235,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2018年第4期61-66,共6页
Petroleum Geology and Recovery Efficiency
关键词
走滑效应
走滑派生
构造构造演化
差异性分区
滩海地区
济阳坳陷
strike-slip effect；strike-slip derived structure；tectonic evolution；differential division；shallow sea area；Jiyang Depression
