The article discusses the recovery process of fracture system formation after hydraulic fracturing in a coal seam, based on conducted seismic studies using modern mathematical software packages. Model concepts fractures development under hydrodynamic impact rock mass are considered, which make it possible to assess nature propagation.

In mining of inclined coal seams in Tangshan coal mine of Kailuan group, gateways on either end of a panel were both typically located along the floor and a gateway pillar between adjoining panels was left unmined between adjacent panels to ensure stability, thus forming a planar mining system. According to the practice, however, it turned out that this conventional mining system has long-stand...

The Middle Jurassic Yan'an Formation in the Ordos Basin (North China) is an important coal-bearing succession. Twenty coal samples and four of silty mudstones were collected from Coal Seam 2 order to determine major, trace rare earth elements; moreover, geochemistry elements, particular yttrium, was investigated. major elements investigation reveals that Si, Al, Na, K, Ti are primarily found cl...

Underground coal gasification (UCG) is a conversion method that permits resources to be exploited in situ using high-temperature reactions. An understanding of the chemical, mineralogical, and petrographic properties coal, resultant unburned carbon, degasified ash (minerals) UCG zone, fundamental determining rates, gas composition, environmental groundwater risk assessments. This study aims pro...