PROCESS OF CALIBRATION OF EQUIPMENT OF INDUCTIVE ELECTROMAGNETIC LOGGING Russian patent published in 1998 - IPC

FIELD: geophysical methods of examination of holes. SUBSTANCE: process involves feed to input of instrument sensor of signals of tests which conductance is less than sensitivity zone of sensor or is bit more. Start of measurement range σ₀ of equipment is found by formula , where U_air is signal " zero in air ", U_Tmax is signal from test equivalent to highest conductance of rocks in examined section σ_Tmax, σ_Ti is rating of test with which pointer of sensor deviates first time, U_out is value of its output signal. Value σ₀ is imparted to zero of scale of diagram recorded along section of hole. EFFECT: increased precision of measurements by equipment of inductive electromagnetic logging. 2 dwg