摘要
完善地震-重力联合反演的一个重要措施是建立一致性模型.本文按照地震测深的常用办法,采用二维四边形非块状模型,通过网格节点的密度值来刻划连续性或间断性的物性分布.四边形单元内部的密度分布为双线性函数,本文给出了重力异常的严谨解析式.计算中可采用模型分解技术,将四边形化为矩形与直角三角形的组合,简化程序设计.算法的实施有两种途径:独立单元法和整体模型法.在联合反演的数值模拟中,还推出了剪切模量μ模型以及纵波速度V_P,与密度ρ的分布关系.
Establishing a consistent model of seismo-gravi'y is indispensable for improving joint inversion. According to the approach adopted in general in deep seismic sounding, 2D non-block model with quadrangle is taken into accunt, and then the strucmre of the Earth interior can be modelled by the density values at grid nodes. This technique is suitable to modelling a complicated structure which has continuous and discoutinuous distribution of the rock properties. The density distribution in each quadrangle element is in terms of bilinear function.Based on the approach of model dicomposition, a quadrangle can be divided further into several relatively simple geometric units, i.e. rectangle and rectangular triangle, according to which the computer program is easy to be designed and has good feasibility.Two kinds of computation techniques, single element method and whole model method, are introduced in the paper. A numerical example of joint-inversion is discussed also. It is meanigful that both model of shear module, μ, and the relation of velocity (Vp)-density (ρ) are inferred from above seismo-gravity consistent model. It can be expected to explore more information about the Earth interior from realistic observation through this way.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第4期463-475,共13页
Chinese Journal of Geophysics
基金
地震科学联合基金
关键词
地震勘探
地震
重力
取合反演
模型
Non-block consistent model, Density element with quadrangle, Density distribution in bilinear function, Analytical gravity formula, Seismo-gra-vity joint inversion.
