To be observed on same field in same time, telluric observation is interfered by electric current in measuring the apparent resistivity, and the data are changed to square impulse.
地电场和电阻率同场地观测时，电阻率观测会干扰地电场的观测数据发生大幅度变化。
2
In TaZhong oil field mainly with carbonate cave reservoir, sounding technology of telluric electricity field plays a great role.