FIELD: mining.
SUBSTANCE: invention relates to the field of underground survey and production and is intended for measurement of properties of specific resistance of earth formations as they are penetrated through well. Combined tool for measurement of specific resistance includes both antennas of induction/propagation and antennas of side specific resistance arranged in grooves on well pipe. At the same time antenna of side specific resistance includes insulating basic layer arranged in groove, toroidal antenna arranged over insulating basic layer and protective device arranged over groove.
EFFECT: increased accuracy and reliability of measurement of underground specific resistance due to provision of combined measurement of specific resistance, using side sensor and sensor of induction or propagation in one and the same area of bed in a single trip.
18 cl, 20 dwg
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