FIELD: control over anomalies of gravitational field in process of secondary extraction of oil. SUBSTANCE: measurement of acceleration gradient of gravity conducted with the aid of gradiometer of the type of accelerometer is optimized by way of inclination of plane of instrument used in measurement through chosen angle above or below horizon to generate data from which systematic errors of instrument can be excepted by means of subtraction or by any other processing and by way of data reading in direction of first azimuth and then in direction of second orthogonal azimuth to obtain absolutely independent measurement of gradient. EFFECT: optimization of production of hydrocarbons by secondary extraction. 6 cl, 11 dwg
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