PROCESS OF GEOELECTRIC PROSPECTING Russian patent published in 1997 - IPC

FIELD: technical physics, geoelectric prospecting by method of transient process and by probing of formation of field in nearest zone. SUBSTANCE: process of geolectric prospecting lies in excitation of nonstationary electromagnetic field by switching off current Io in generating-receiving circuit, in determination of maximal amplitude U of polarity of emf of self-induction of circuit, in supply of voltage E1 with polarity opposite to emf of self induction to generating-receiving circuit in time interval from t1 to t2. Voltage E2 with polarity opposite to emf of source forming current Is fed in time interval from t_o - start of switching off of current to t₁. Emf of nonstationary electromagnetic field is measured with delay Δt of start of counting relative to time t_o and is used to determine geoelectric characteristics of examined section. Time moments t1 and t2 are so selected that there is no inherent oscillatory processes in generating-receiving circuit in recorded signal. Voltage value E2 and time delay Δt of start of counting are determined from relations E₂≥4, Δt≥t₂-t₀. EFFECT: improved authenticity of process. 7 dwg