Oil shale is an important unconventional oil and gas resource, but it poorly utilized in the Dalianhe coal mining area, northeastern China. Systematic sampling test analysis were used to evaluate characteristics of quality. The research shows that between middle lower seams coal-bearing member a rich ore with high content, medium calorific value, ash volatile low moisture, ultralow sulfur conte...

Abstract Underground coal gasification (UCG) is a technology that can increase the value of coal. This turns into gas below surface through process. UCG offers many applications for power generation, heating, and chemical industry. The Mangunjaya area one prospecting area, located in South Sumatra Basin, which has been actively producing long time. study focused on determining potential locatio...

In order to study the coal pillar stability of gob-side entry in gently inclined seam, a comprehensive method including theoretical analysis, numerical modeling, and field monitoring was applied its fracturing instability mechanism. The results show that uneven horizontal stress internal cause asymmetric deformation failure seam. rotation movement main roof distribution were closely related inc...

To determine the layout parameters of gas drainage roadway (GDR) serving for working face, an analytical calculation method fracture zone and modelling experiment were adopted, overburden fissure induced by mining height analyzed. For research on distribution method, multiple factors influencing failure mode strata considered. The #1207 face in Sima mine was taken as engineering background, GDR...