Its main composition is methane, but the utilization of methane is low.
其主要成分是甲烷，但煤层气中甲烷气体利用率却较低。
By ingredient analysis, we find that main composition of the oily sand is sand.
通过组成成分分析发现，落地油泥固含量最高，主要以沙土为主；
The results indicate that the main composition of nephrite cat's eye is tremolite.
结果表明：四川软玉猫眼的主要成分为透闪石。
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