随机溶洞介质模型及其波场模拟  

Random cavity medium model and the wave field simulation

作　　者：奚先[1] 姚姚[2] 顾汉明[2] 

机构地区：[1]中国地质大学(武汉)数学与物理系 [2]中国地质大学(武汉)应用地球物理系

出　　处：《地球物理学进展》2005年第2期365-369,共5页Progress in Geophysics

基　　金：国家自然科学基金项目(40174034);国家自然科学基金项目(40274038)联合资助.

摘　　要：提出了一种模拟构造随机溶洞介质模型的新方法.从现有的随机介质模型理论出发,以混合型连续随机介质的每一个局部最大值点作为一个溶洞分布区的中心点,本文引入了溶洞分布区的局部半径d和溶洞面积p这两个模型特征量,采用阀值截取方法模拟构造各种不同形式的随机溶洞介质模型.用局部半径d描述溶洞介质在大尺度上的离散程度,用溶洞面积p描述在各个溶洞分布区中溶洞介质的面积.通过选择从不同的混合型连续随机介质模型出发,选择不同的局部半径d和溶洞面积p,使用阀值截取法,我们可以最终得到能灵活、准确地描述实际复杂溶洞介质的各种随机溶洞介质模型.本文最后在各种不同形式的随机溶洞介质模型中,作了平面弹性波自激自收记录的数值模拟,并得出了一些结论.This paper brings forward a kind of new simulation method of the random cavity medium model. Starting from the existing theory of the random medium model, and taking every local maximum point of a mixed type continuous random medium as the center point of each cavity distribution area, this paper introduces the two model characteristic quantities namely the local radius d and the cavity area p, and simulated all sorts of different random cavity medium models by the method of the valve value intercepting. Using the local radius d to describe the dispersion degree of the random cavity medium on large scale and using the cavity area p to describe the area of the cavity medium in each cavity distribution area. Via choosing to get going from each different mixed type continuous random medium model, and choosing each different local radius d and the local density p, we could generate a great variety of the different cavity media, and gains each random cavity medium model that is capable of describing the practical complex cavity medium smartly and accurately. In the end this paper simulats the zero-offset-time-records of the elastic plan wave numerically in the each different random cavity medium, and gains some conclusions.

关 键 词：随机溶洞介质 阀值截取法 局部半径 波场模拟 

分 类 号：P631[天文地球—地质矿产勘探] P315[天文地球—地质学]