Abstract：In order to accurately calculate all-time apparent resistivity,the analytic formula of the transient electromagnetic response for ramp turn-off of a large fixed rectangle transmitting loop is derived in the article.During calculations of apparent resistivity,effects of ramp turn-off can be revised and approximations of numerical integration can be avoided.So the calculation precision will be improved greatly and computer time will be less.Calculations using the analytic formula show its special advantage by theoretical practical examples.
刘正, 杨生. 瞬变电磁法大定源回线斜阶跃波响应计算[J]. 石油地球物理勘探, 2011, 46(2): 326-330.
LIU Zheng, YANG Sheng. Computations of ramp turn-off response of a large fixed rectangle transmitting loop. OGP, 2011, 46(2): 326-330.
