There is widespread coal seam of Permo-Carboniferous in Jiyang Depression. The coal has good quality, moderate evolution degree resulted in the foundation of forming medium coal-derivedgas reservoir.
济阳坳陷石炭-二叠系煤层分布广泛，煤质优良，演化程度适中，具有形成中型煤成气藏的基础。
2
A hydrocarbon deposit, such as petroleum, coal, or natural gas, derived from living matter of a previous geologic time and used for fuel.
碳氢化合物的沉淀，如石油、煤、天然气等，由古代生物衍生而成，经过开发后用作燃料。
3
Conditions of mercury speciation transformation and effects of sulfur and chlorine on mercury emission were analyzed for gas products derived from coal gasification and combustion processes.