起伏地形条件下FPS不同解释方法对比

固定点源激电测深(FPS)是一种有效的激发极化测深勘探方法,但在数据解释中,常规的定量解释法只适应较为简单的地电条件,在起伏地形条件下其解释效果会受到较为明显的影响。针对常规的定量解释方法所存在的不足与缺陷,这里从有限单元法正演模拟入手,采用最小二乘法进行反演计算,实现了在起伏地形条件下的对地电模型进行模拟计算,并将圆弧交汇-相对强度计算结果与最小二乘反演计算结果进行对比。结果表明:最小二乘反演方法能适应起伏地形对模型进行反演计算,其反演效果优于圆弧交汇-相对强度法计算结果。

Different interpretation methods of FPS in undulating topography conditions

The fixed point source IP sounding （FPS）is a kind of effective excitation polarization sounding exploration method. But in the data interpretation,regular quantitative interpretation of arc intersection - relative intensity （AIRI）method just a-dapt to some simple geoelectric conditions and models,affected by the undulating topography conditions obvious.Aiming at the deficiencies and defects of regular quantitative interpretation methods,this study calculates a plurality of geoelectric model in-stance based on the forward modeling of the finite element method,used the least square method,and wrote the program with VC＋＋.Then the AIRI calculation results and the least square inversion results were compared.The results showed that the least square inversion method can adapt to various geoelectric conditions to inversion,the inversion effects is superior to the cal-culation results of the AIRI method.