MODE OF GEOELECTRICAL PROSPECTING Russian patent published in 2007 - IPC G01V3/08 

FIELD: the invention refers to electrical prospecting on an alternate current excited in the ground with inductive method and may be used at searching anomalous objects in the ground laying at the depths to 500 meters.

SUBSTANCE: the essence is in passing low frequency current in a ungrounded noose. The phase shifts are measured on each profile φ_p(l)=φ_ρ(l)+φ₀, where φ_ρ(l) and φ₀ are correspondingly phase shift conditioned by electrical conductivity of rocks and a constant but unknown phase shift. Specific resistance ρ₀ is defined for which functional where l,l₁,l₂- correspondingly current, of the beginning and the end of the profile l₀=(l₁+l₂)/2; φ_p(l₀), φ_th(1), φ_th(l₀)- correspondingly phase shift measured in the point l_0, theoretical for homogeneous half-space, theoretical in the point l₀. Phase shifts φ_ρ(1) of Cartesian components of magnetic induction relatively to the current in the ungrounded noose out of expression φ_ρ(1)= φ_p(1)-φ_p(l₀)+ φ_ρ0(1₀). According to the structure of phase shifts φ_ρ(1) on the square the presence in the Earth of anomalous conducting objects are defined.

EFFECT: increases accuracy and efficiency at area investigations.

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