ANALYSIS OF THE RESULTS OF QUANTITATIVE EVALUATION OF SAND-AND-CLAY ROCKS’ OPEN POROSITY ON CORES
Issues of core sample porosity measurements by different techniques have been considered. Both systematic and random discrepancies among the values measured by different methods on the same sample have been found. The systematic discrepancies were caused by voids swelling in the course of samples preparation for measurements, as well as adsorption on the inner surface of the rock saturated with different liquids. Quantitative values of the systematic overestimations of porosity due to the adsorption in the sand-and-clay rocks containing different clay minerals have been established. Practical recommendations have been given.