GEOLOGICAL AND STRUCTURAL MODELS OF FORMATION AND ACCUMULATION OF GAS IN MAN-MADE RESERVOIRS OF COAL ROCK MASSIVES

Abstract

The formation of technogenic reservoirs of coal-rock massifs is determined by the depth of development, lithological features of the host rocks and the gas content of the coal-rock massif. The formation and redistribution of gas-saturated zones and migration routes in coal-rock massifs continues even now, which is associated with modern fluid migration. Gas, filling the mine workings of closed mines, creates a threat to communications, structures as a result of explosions and has a negative impact on human health.  It has been established that the regular distribution of gaseous hydrocarbons is determined by discontinuities and confirms not only the diffusion gas saturation of the massif, but also the tempo, that is, the gas saturation of the massif through discontinuities during tectonic (tectonic-magmatic) activations. At the same time, it should be noted that geological discontinuities were not the “transport arteries” of gaseous hydrocarbons not throughout the entire space. For most of its strike, coal and rocks in the zones of discontinuities are folded, and there is almost no gas transmission. The worked-out space of active mines is a new technogenic reservoir suitable for the accumulation of gaseous hydrocarbons, the thickness of which exceeds the thickness of the coal seam. The active processes of gas migration in the exhaust space are indicated by the study of the residual gas component, in the mixture of which helium, hydrogen and quantitative changes in hydrocarbon gases (C2 - C6) were found.