Authors: A.A. Isachenko, T.V. Petrova

Title of the article: Regularities of the manifestation of dynamic events and the distribution of local methane reservoirs in a structurally heterogeneous rock mass during the development of coal seams with the use of early degassing

Year: 2022, Issue: 3, Pages: 54-63

Branch of knowledge: 25.00.22 Geotechnology (underground, open and construction)s

Index UDK: 622.831.325 : 622.831.325.3

DOI: 10.26730/1999-4125-2022-3-54-63

Abstract: The development of methane-bearing coal seams in a structurally heterogeneous rock mass is accompanied by the manifestation of dynamic and microseismic events with the release of methane from local reservoirs adjacent to the boundaries of tectonic blocks. In the process of research, regularities of changes in methane pressure and water flow rate were revealed during early degassing of the mined coal seam. The authors established linear dependences of the number of natural and man-caused dynamic events within the mining field panel and pumped water from wells for early degassing: the intensity of the manifestation of recorded dynamic phenomena is 4.6 times with a constant increase in water flow from wells (more than 2.5 m3/day) . Boundary criteria for the dependence of water flow rate change in a group of degassing wells over a limited period of time have been determined, within which the frequency of manifestations of dynamic and seismic phenomena significantly increases for specific mining and geological conditions. Mutual influence of adjacent wells for early degassing within 1200-1500 m was established and technological solutions for the optimal location of wells were substantiated. The recommendations were used in the development of a complex degassing project, including multi-stage methane extraction using traditional methods of barrier, early and in-situ degassing of coal-methane seams in seismically active coal mining areas.

Key words: coal seam methane reservoirs early degassing dynamic phenomena microseismicity water flow rate

Receiving date: 03.04.2022

Approval date: 07.06.2022

Publication date: 07.07.2022

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