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-derived gas 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。

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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。

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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.

分析了煤气化和燃烧过程的气体产物中汞形态转化的条件，以及烟气中硫和氯元素对汞排放的影响。

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Energy derived from natural gas and coal-fired power plants, for example, creates more than 10 times more hazardous waste than the same energy created by a solar panel, according to Mulvaney.

NPR: Solar Industry Grapples With Hazardous Wastes

The air force is working to certify all its aircraft to use synthetic fuels made from gas derived from coal or biomass, using the Fischer-Tropsch method used by Germany during the second world war.

ECONOMIST: Monitor

Originally they were derived from coal-tar, the black viscous waste product left over from distilling coal for gas.

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