A relatively great amount of prospecting and development activity for hydrocarbons and minerals was and is being performed in Hungary. Among them prospecting for oil and gas is considered as the most important object, however the development of bauxite, copper and iron ores, coal deposits and fresh water reserves cannot be neglected either. Fine-grained sandstones with a high silt and a relatively small clay content, moreover fractured and vuggy limestones and dolomites and dolomitic breccias represent the main hydrocarbon-bearing rocks. Interpretation methods for the evaluation of hydrocarbon-bearing sandstones are presented in the paper. These may be classified into two main groups:- Application of Archies's formulae while changing the values of exponents m and n;- Taking into account the quantitative effects of silt and shale components, and application of special new interpreting formulae including constant values of exponents m and n. Lithological and reservoir parameters determined in the latter way and accuracy of them are showed. A report is also given on the well logging program applied. A combined interpretation method is applied in carbonates to distribute the effective porosity into matrix-, fractured- and vuggy porosity components. The procedure and the well logging program are showed.

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