The TEM Inversion Study of Combining Genetic Algorithm and Damped Least Square Method

摘要

In the inversion of transient electromagnetic data,a reasonable initial model is necessary,but offering a rational initial model is always difficult.Even the model can be acquired,the parameter maybe not enough,which is only suitable for the simple layered earth.But when dealing with an actual profile,it is not reasonable to match the result of each point together.In order to put up with the defect,in this paper,we offer a solution which calculates the all-time apparent resistivity that describe the resistivity variation along the depth firstly,and then get the model which the every thickness is reasonable with the genetic algorithm,at last,combining the Damped Least Square Method to gain the ultimate inversion model.The four types models inversion result show that this algorithm can confmn the resistivity and thickness well and have some significance to the actual data processing.