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The new technology of oil and gas deposits prospecting developed by authors are considered in this paper. The method is based on «local generalised gradient zones-tubes» (broad gulls-zones-tubes) selection of the geophysical fields, which corresponding to real subvertical zones-tubes of Earth crust. Application of technology has confirmed well- known gas-condensate deposits on a shelf of Barents sea. New sites, perspective for detection of oil and gas deposits have been revealed. Use of this technology in geological prospecting will allow to find new perspective sites for oil extracting on a shelf by detection of new perspective log-zones. And also will allow to reduce number of prospecting boreholes for perspective estimation of allocated oil and gas shelf areas