Bezruchko K. Terms of gas accumulations forming and conservation in low-porous carboniferous deposits.

The thesis is devoted to the substantiation of forming and conservation terms of hydrocarbons accumulations in a carboniferous massif, with the purpose of actual scientific problem solving - prognosis estimation of low-porous terrigenous rocks perspective in the local anticlinal structures of carboniferous strata. It was proved that at a tension which has overrided overall significance for violation of wholeness and minimum fragile deformations of break, the filtration properties which correspond the industrial collectors of the IV class, favourable for the methane accumulation, are formed in low-porous sandstones due to crevise deformation. On principles of the offered separate phases interaction and two-way influens model of the system "water-gas" in the rock massif, it is shown that forming of gas accumulations takes a place as a result of phases redistribution in consequence of system aspiring to the equilibrium. The conditions of gas accumulations forming and conservation were substantiated and the parameters of filtration and capacity properties were estimated, which characterize rock-collectors, collector-screen limit and screens in carboniferous deposits. It was found out, that natural water saturation increasing of Donbas sandstones in the catagenesis process is conditioned by growth of residual water saturation, mainly due to microcapillary moisture and accompanies by diminution of sandstones internal specific surface, both volume and mass. The geological bases of prognosis estimation of local anticlinal structures perspective for the searches of free methane accumulations in carboniferous deposits was developed.