二维应变速率正演模拟  

2-D strain rate forward modeling

作　　者：陈林[1,2] 宋海斌[1] 董崇志[1,2] 张炯[3] 赵长煜[3] 

机构地区：[1]中国科学院地质与地球物理研究所地球深部重点实验室,北京100029 [2]中国科学院研究生院,北京100049 [3]中国地质大学北京地球物理与信息技术学院,北京100083

出　　处：《地球物理学报》2008年第6期1819-1825,共7页Chinese Journal of Geophysics

基　　金：国家基础研究发展规划项目(2007CB411704);中石化海相前瞻性研究项目《中国陆域海相沉积盆地热体制与油气资源潜力》资助

摘　　要：由给定的随时间和空间变化的二维应变速率分布计算速度场,根据速度场计算二维热传导方程,得到岩石圈的热演化结构,然后计算由热扰动引起的密度变化,进而确定加载到岩石圈上的载荷,根据载荷计算挠曲方程,最终得到盆地的沉降.在此基础上讨论了热源对地表热流和沉降的影响以及岩石圈有效弹性厚度对盆地几何形态的影响.结果表明,热源对地表热流影响显著,对沉降影响不大,岩石圈有效弹性厚度则控制盆地的几何形态.二维应变速率正演为下一步的反演奠定了基础.Given the variation of two-dimensional strain rate through space and field is calculated. This velocity field determines the evolving thermal time, the structure velocity of the lithosphere. The temperature structure constrains the changing density structure which defines the loading history. Finally, subsidence history is calculated by solving the flexural equation with the imposing loads. Based on the forward modeling, we analyze the effects of heat source on surface heat flow a the geometry of ri surface heat flow b controls the geome nd subsidence and study how the lithospheric effecti fted basins. The results indicate that heat source ut has little impact on subsidence. The lithospheric try of rifted basins. The forward modeling provides ve elastic thickness affects has significant effect on effective elastic thickness a good foundation for the inversion of 2D strain rate.

关 键 词：应变速率 沉降 热源 地表热流 有效弹性厚度 

分 类 号：P542[天文地球—构造地质学]