渤海湾盆地东营运动的特征及成因分析

A STUDY ON THE GEOLOGICAL CHARACTERISTICS AND GEODYNAMIC ORIGIN OF DONGYING MOVEMENT, BOHAI BAY BASIN

史卜庆 吴智平 王纪祥 周瑶琪 戴启德

SHI Bu-qing WU Zhi-ping WANG Ji-xiang ZHOU Yao-qi DAI Qi-de

石油大学(华东)油气资源与环境地质研究所, 山东东营257062 2. 石油大学(华东)石油资源科学系石油地质教研室, 山东东营257062

Petroleum Resources and Environmental Geology Research Institute, University of Petroleum, Dongying 5706, China 2. Petroleum Resources Science Department, University of Petroleum, Dongying 257062, China

渤海湾盆地东营运动是一个范围广泛、强度较大的区域性构造运动,处在由盆地的裂陷阶段向坳陷阶段过渡时期。形成了众多小规模次级断层、全区整体抬升并遭受剥蚀,局部发育反转构造。该运动以及渤海湾盆地在伸展裂陷阶段的多次构造运动说明渤海湾盆地呈现出幕式沉降过程,东营运动则具有更重要的动力学意义。岩石圈快速拉伸、上地幔上涌和温度升高以及壳下岩石圈的弹性回返可以很好地解释东营运动的形成过程以及渤海湾盆地演化阶段的转折。考虑地壳均衡效应,可以对传统的地层剥蚀量计算方法进一步修正。渤海湾盆地东营运动的形成和发展有利于盆地内油气的生成和运移。

Dongying movement in Bohai Bay Basin is an intensely regional tectonic movement occurred during late Paleogene. According to the geological features of Dongying Movement in Bohai Bay Basin and the research results of the former, this paper analyzed the potential geodynamic origins of Dongying movement. One is the effect of quick stretching of lithosphere, upwelling and temperature raising of upper mantle, the other is result of the flexibility discrepancy among upper, lower crust and lithosphere under crust during the lithosphere cooling. Furthermore, this paper illustrated the reason of transition of basin evolution style, i.e. from rifting and extension to uplifting and whole subsidence during Dongying movement of Bohai Bay Basin. Based on isostasy principle, this paper made out a correction method for the calculation of disconformity erosion amount. The possible influences of Dongying movement on the formation and accumulation of petroleum reservoir in Bohai Bay Basin were mentioned.

中国石油天然气总公司“九五”科技攻关项目(95-01-03);石油天然气总公司中青年创新基金课题“渤海湾盆地N/E间断面研究”

https://doi.org/10.11781/sysydz199903196