一种基于地质模型的电性与速度界面不一致的联合反演方法

A joint inversion method based on the disaccord between electricity and velocity boundary of a geological model

当电性与速度界面不一致进行联合反演时,存在参与联合反演的数据不同源的问题,如果做界面一致的假设,会降低反演的可靠性,建立电性与速度统一的反演模型是解决问题的关键。文章分析了地球物理勘探各类目标之间的相互关系,建立以地质模型作为速度和电性联合反演的统一模型,根据地质模型与物性模型、以及地球物理场分布特征的关系,模拟实际地质、地球物理状况,采用基于模式识别的联合反演算法,以直流电测深与地震数据为例进行了模拟实验,实验结果表明:以地质模型作为速度与电性不一致的联合反演统一模型是可行的。

If a joint inversion has been processed when electricity and velocity boundary are inconsistent,there should be a problem of different sources of the data which have been enlisted in joint inversion;supposing the boundary is consistent with the electricity,the reliability of the joint inversion should be reduced.Inhence,the key to solve the problem is to set up an inversion model with accord between electricity and velocity.It has analyzed the correlation among every objects of geophysical prospecting,and built up a geological model as an uniform model for joint inversion of velocity and electricity.According to the relationship among geological model,physical properties model,and the distributing characteristics of geophysical field,it has carried on simulating experiments through simulating practical geological and geophysical status,adopting the joint inversion calculation based on model discrimination,as well as taking D.C.sounding and earthquake data as examples,and the results have shown that it is a feasible method to take geological model as an uniform model for the joint inversion when electricity and velocity are inconsistent.