FIELD: seismic prospecting. SUBSTANCE: length L of wave of prevailing seismic background at unpromising section when correlation between similar components is attenuated half as much is determined. At least two three-component sets are located at section being explored at distance of L/4. Natural seismic background is recorded by all components at frequencies of 1-20 Hz. Availability of oil or gas occurrence is indicated by shift of the maximum of frequency spectrum of seismic signal recorded at area being explored towards low frequencies as compared with the maximum of frequency spectrum obtained at unpromising area. EFFECT: enhanced reliability. 6 dwg
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