FIELD: geophysics, particularly, geophysical methods of well investigations; applicable in research of the Earth crust for detection of zones of geological complications in drilling of deep wells and solving problems of engineering geology. SUBSTANCE: method is based on registration of signals of electromagnetic radiation at frequencies of 50-120 kHz for 2-3 min on selected intervals of depths in well and detection of signals with their harmonic analysis. Zones of fissured rocks are detected by variation of amplitude level in periods of 4-20 s in spectrum of detected signal. EFFECT: higher reliability of detection of low-generating fracturing zones. 1 dwg
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