The gas of QHD30 1 is mixed gas and mainly from the coal derived gas from pre Tertiary source rocks.

QHD3 0 1气藏的天然气属多源混合气，主气源为前第三系的煤成气。

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The coal quality of Xiangxi stage is not good and stable but the coal appears dark mud, well develops shale and has high evolution level, which is favorable to create coal derived gas.

香溪煤系煤质较差，极不稳定，但该煤系暗色泥、页岩发育，演化程度较高，有利于形成煤成气。

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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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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

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

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

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