The paper presents data on water content separated into free, physically and chemically bound types for a collection of core samples from the Bazhenov formation. The rock samples came from 3 wells of Nizhnevartovsk arch, Western Siberia, Russian Federation. Each rock sample was a part of whole core with the maximum preserved natural water content. A suite of modern laboratory techniques includes evaporation method, derivatographic, and hygrometric studies. The results show that the content of chemically bound water (0÷6.4 wt.%) exceeds that of free (0÷1.87 wt.%) and physically bound (0÷1.0 wt.%). For the first time, we present the water content of mono-, poly-, and capillary condensation water obtained from the interpretation of adsorption isotherm. These data made it possible to draw a meaningful conclusion on mixed wettability of Bazhenov formation rocks.

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The article presents the first results of determining the content of different types of bound water by hygrometric method — adsorption isotherm method — for non-extracted air-dry samples of Bazhenov formation rocks. The obtained water sorption isotherms for the studied samples have a well-expressed s-shape, which allows to determine the maximum possible amount of bound water of different types in them — mono-, poly — and capillary condensation and to draw an important conclusion about the hydrophilicity of the Bazhenov formation deposits. According to the form of sorption isotherms, the amount of bound water and the proximity of mineral compositions, nine samples were combined into 4 different groups, the remaining samples were considered individually. A correlation between the pore water content and the content of mono- and multilayer water was found.

The first results of determination of the content of different types of bound water by hygrometric method — adsorption isotherm method — for extracted rock samples of Bazhenov formation are presented. All obtained water sorption isotherms have a well-defined S-shape, which allows to determine the maximum possible amount of bound water of different types (mono -, poly-and capillary condensation) in all studied samples. The inflection points of the isotherms of the extracted samples fully correspond to the inflection points of the isotherms of the native samples. Based on the obtained results, it is possible to further estimate the specific surface area of the samples, and then determine the hydrophobicity coefficient and the parameters of the associated oil saturation.