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。

youdao

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。

youdao

Development of technologies for efficient removal of H2S from coal derived fuel gas is now recognized as to be crucial to the economics of coal utilization in the IGCC and MCFC processes.

高温脱除燃料气中的H2S是其中的关键技术，高温脱硫目前存在的问题是脱硫剂使用过程的粉化。

youdao

Forbes energy blogger Robert Rapier wrote about the potential of coal-derived ethanol a few years ago.

FORBES: A Name You Need To Know In 2011: Celanese

One big seller: the coal-derived carbon material that is used in the smelting of aluminum, which in turn is in strong demand in the airplane and construction industries.

FORBES: Magazine Article

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

FORBES: Jelly Beans: Which Color Is Most Popular At Easter? Why We Love Colored Foods