地—井瞬变电磁关键技术问题研究
杜庆丰, 冯晓兰, 黄跃

Research on key technical problems of surface-borehole TEM
Qing-Feng DU, Xiao-Lan FENG, Yue HUANG
图5 白石泉506钻孔x分量早、中、晚期感应电动势剖面
Fig.5 X-component profiles of induced electromotive force in early,middle and late stages of Baishiquan 506 borehole