A model of synthetic gas hydrates in a mixture of quartz pellets is considered using by tetrahydrofuran solution based on distilled water. The analysis of the NMR-characteristics of tetrahydrofuran hydrate in clayed sand is performed. The stages of hydrate dissociation excluding water contribution are established and it is shown that the NMR-relaxometry method is sensitive to the clay content. The obtained results allow us to more detailed study the processes of hydrate formation in real reservoir rocks and their physical characteristics.

The paper deals with analysis of the geochemical and NMR characteristics of oils from a number of fields in the West Siberian oil and gas province. The group composition of the studied samples was estimated by NMR data. The correlation with the results of geochemical analysis was established.

The work is devoted to substantiating the lithological interpretation of dielectric logging data in the Bazhenov Formation intervals, based on the frequency dispersion effect of bazhenites. Mathematical modeling shows the high sensitivity of the relative amplitude-phase characteristics to the frequency-dependent electrophysical characteristics of carbonate-siliceous-clay deposits in a high-frequency range. The results of the study indicate the fundamental possibility of dielectric logging data numerical inversion to highlight the main lithological types of the Bazhenov Formation rocks.

In this paper, we consider an effect of incorrect accounting of the overburden structure and interfaces curvature on results of nonlinear AVO inversion. The research is carried out on synthetic data obtained using ray method for two- and three-layer models with convex and concave interfaces. We show that neglect of the overburden heterogeneity leads to inversion errors about 10–19 % and neglect of the reflector’s curvature to errors about 2 % for convex and 11 % for concave interfaces.