METHOD OF MARINE HIGH-ACCURACY MAGNETIC SURVEY Russian patent published in 2018 - IPC G01V3/00 

FIELD: geology.

SUBSTANCE: invention relates to geological mapping in water areas and mineral explorations by geophysical methods, in particular to placer mining explorations. Method for accounting for geomagnetic variations during marine magnetic surveys with high accuracy using gradiometric magnetic survey, results of which, after integration (summation of gradients), are not used as a change in the magnetic field on the profile, but are only used to calculate the variations observed on the profile, used as the zeroth approximation in the indirect method for accounting for variations, which allows achieving a very high accuracy of survey magnetic field module T, since integral graphs, in which, because of smoothing the observed field by differential basis Δx a fine structure of field T is distorted, and a decrease in the base (distance between two magnetometers) Δx leads to a large error in the measurement of weak gradients, are not used. Therefore, the gradiometric method does not comprises using the integral field obtained through gradients during studying a fine structure of the magnetic field.

EFFECT: variations can be calculated and used as the zeroth approximation in the indirect method for accounting for variations.

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