Abctract:In this research paper there was made a new approach to the oil and gas index area description at the category level and inorganic deposit in a borehole formation prognostication process at the category level. The importance of the decision support problem on the levels of exploration, prospecting and exploitation of oil and gas deposits has revived high and permanent interest in this scope of an inquiry. Theory of category use for the quantity and quality info streams calculation for the weak-structured oil and gas object description. It is efficient to use the existing oil and gas field stripping technologies on the basis of this theory.