煤成气 meaning in Chinese

coal-derived gas
coal-formed gas

Basin dynamical features of coal - related gas assemblage in jiyang depression
济阳坳陷煤成气富集成藏的盆地动力学特征
The deep gas of dongpu sag can be divided into three types such as coal - formed gas , petroliferous gas and combination gas , which have different space distribution for each type
东濮凹陷深层气可分为煤成气、油型气和混合气3种类型，不同类型的深层气具有不同的空间分布规律。
The characteristics of gas from fluid inclusion show that these gas are generated from coal and is very different from gas in gas fields . authors speculate the times of gas filling reservoir are two at least . at early time , it is probably coal type gas
用这种方法对鄂尔多斯盆地中部气田的储层包裹体中烃类气体碳同位素进行了测定，结合单个包裹体成分及均一温度认为该区有两期成藏史，并且早期可能主要来源于煤成气。