CAJ | 학술논문

由于受发射线圈电感和电容的影响，瞬变电磁发射电流类似斜阶跃关断，采用阶跃关断“单烟圈”理论进行视电阻率解释，在早、中期产生失真。根据斜阶跃关断二次场感应电压表达式，提出采用“双烟圈”理论进行解释：将完全关断后二次感应电压等效为大小相等、方向相反、先后发射的两个“单烟圈”二次磁感应强度之和。分别采用前向递推和后向递推两种方法，计算出每个烟圈二次磁感应强度，再利用“单烟圈”二次磁感应强度的单调性，计算斜阶跃关断全期视电阻率，消除了失真。最后通过数值模型，验证了方法的正确性，为全程瞬变电磁探测及解释提供理论支持。
유우수발사선권전감화전용적영향，순변전자발사전류유사사계약관단，채용계약관단“단연권”이론진행시전조솔해석，재조、중기산생실진。근거사계약관단이차장감응전압표체식，제출채용“쌍연권”이론진행해석：장완전관단후이차감응전압등효위대소상등、방향상반、선후발사적량개“단연권”이차자감응강도지화。분별채용전향체추화후향체추량충방법，계산출매개연권이차자감응강도，재이용“단연권”이차자감응강도적단조성，계산사계약관단전기시전조솔，소제료실진。최후통과수치모형，험증료방법적정학성，위전정순변전자탐측급해석제공이론지지。
Owing to the impact of inductor and capacitor of transmit coil, the transmit current of transient electromagnetic turns off like the ramp current. If we use the "single smoke ring" theory which fits for step turning off transmit current to make interpretation, the distortion will occur during the early and middle stage. According to the expression of second field induced voltage for ramp current, this paper presents interpretation with the"double smoke ring" theory, i.e., the secondary field induced voltage is made to be equiva-lent to the summation of secondary magnetic induction excited by two equal, opposite and successive"smoke ring" after the current is completely turned off. The secondary magnetic induction excited by every"single smoke ring" is calculated with forward and backward recurrence respectively. After that, the monotony of secondary magnetic induction excited by "smoke ring" is utilized to calculate the full-time apparent resistivity of ramp current and remove the distortion. At last, the numerical simulation model is used to confirm the correctness. The results obtained by the authors provide theoretical support for the full-time transient electromagnetic exploration and ex-planation.