The gas of QHD30 1 is mixed gas and mainly from the coal derived gas from pre Tertiary source rocks.
QHD3 01气藏的天然气属多源混合气，主气源为前第三系的煤成气。
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。
For effective desulfurization and deashing of high-sulfur coal with its use of usual magnetic separation device, a surface magnetism enhancement of coal-derived minerals is a new key technology.
煤系矿物的表面磁性强化是利用通常磁选设备实现高硫煤脱硫脱灰的新型关键技术。
The competitiveness of coal-derived natural gas lies in the use of low-price, low-quality coal and technologies needed are coal gasification and methane production techniques.
其竞争力主要源于可采用低价劣质煤，需要选择的主要是煤气化及甲烷化技术。
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。
It challenges the old concept that coal-derived oil, condensate and some light oils do not emit fluorescence.
否定了认为煤成油、凝析油及部分轻质油不发荧光的观念。
It challenges the old concept that coal-derived oil, condensate and some light oils do not emit fluorescence.
否定了认为煤成油、凝析油及部分轻质油不发荧光的观念。
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