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This paper addresses the problem of detection and mapping of deposits under the regional activities. It is a complex application of geophysical methods to estimate the infiltration of hydrocarbons from lovushek.Naibolee typical feature is to reduce the density and magnetic properties of complexes of rocks overlying the reservoir. From this point of view, the magnetic and gravitational fields should reflect the general properties of differentiation, leading to synchronous changes in the magnetic field and the acceleration of the gravity field. Analysis of the structure of the magnetic and gravitational fields in the standard form does not allow to distinguish information related to the presence of hydrocarbons, and therefore it is more convenient to analyze the structure using horizontal gradients.