琼东南盆地岩石圈特征的构造模拟约束  

Tectonic Modeling Constraints on Lithospheric Characteristics of the Qiongdongnan Basin

作　　者：吴哲[1] 杨风丽[1] 吴建勋 

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092 [2]江苏省地球化学勘查与海洋地质调查研究院,南京210007

出　　处：《高校地质学报》2010年第4期483-491,共9页Geological Journal of China Universities

基　　金：863计划"深水油气盆地综合评价系统及综合评价技术-1"(2006AA09A101-0202-1)资助

摘　　要：琼东南盆地是晚始新世时期发育于南海北缘的伸展性盆地。本文在利用盆地内区域2D地震资料构造解释的基础上,运用基于弹性梁模型和挠曲均衡原理的2D构造模拟软件对琼东南盆地岩石圈结构特征进行模拟。研究发现:琼东南盆地地区的有效弹性厚度在1～5km,最佳取值为3km;拉张因子在1.3～1.5,其中裂后阶段反演模拟的拉张因子为1.5,裂陷阶段正演模拟的拉张因子为1.3左右。最后对红河断裂新生代的活动以及南海扩张运动对模拟产生的可能影响进行了分析与讨论。The Qiongdongnan basin is an extensional basin formed in Late-Eocene.In this study,based on the flexure isostasy principle and flexural cantilever model,we utilize 2D structurcal simulation software and calculate the effective elastic thickness valuse（Te）and the extensional factors on 2D interpreted seismic profiles.The results show that the effective elastic thicknesses vary in the range of 1-5 km,and their optimum value is 3 km.The extensional factors change between 1.3 and 1.5,about 1.5 for the post-rift period with forward modeling,and about 1.3 for the syn-rift period with inverse modeling.Finally,we discuss the possible influential factors of the activity of the Red River fault in the Cenozoic and the South China Sea spreading.

关 键 词：琼东南盆地 有效弹性厚度 拉张因子 红河断裂 岩石圈结构模拟 

分 类 号：P554[天文地球—构造地质学]