(中南工業(yè)大學地質(zhì)系，長沙410083)
摘 要: 在對近區(qū)場積分表達式中各積分因子特性分析的基礎上，提出了一種解決近區(qū)場含兩個Bessel函數(shù)奇異積分的分段Simpson積分法，較好地處理了近區(qū)視電阻率的數(shù)值計算問題。
關鍵字: 視電阻率 頻域電磁測深 雙頻組合波 數(shù)值計算 分段Simpson積分法
ELECTROMAGNETIC SOUNDING IN NEAR-FIELD ZONE
（Geology Department，Central South University of Technology，Changsha 410083）
Abstract:On the basis of analysing the characteristics of each integral factor in near source field expressions，a new piecewise Simpson integration for improper integral composed of double Bessel functions was advanced,and the problem of numerical calculation for apparent resistivity in near field zone was fairly solved.
Key words: apparent resistivity frequency-domain electromagnetic sounding dual-frequency combination wave numerical calculation piecewise Simpson integration.
