“shale” gas

Purpose. Investigations of composition of gas within closed porosity (fluid inclusions and closed pores in rocks) of prospective gas-bearing Silurian graptolitic argillites of Lviv Paleozoic depression and ground of plausible mechanism and dynamics of gas generation during “shale” gas formation in productive strata of black-shale formations of the region. Methodology. The composition of volatile fluid inclusions and closed pores of rocks, and their relative gas saturation and water saturation were determined by mass spectrometric chemical method.

The dynamics of “shale” gas reservoirs formation in the processes of exfiltration catagenesis was showed. Several types of hydrocarbon reservoirs were distinguished. These reservoirs in different parts of clayey complexes were forming not simultaneously and differ by individual way of structure and fluid regime evolution. In connection with latter it is necessary to use the individual approach to oil-gas extracting works in each specific situation.