全世界煤的储藏量远远高于石油和天然气。全世界尚未开采的煤层有几万亿 t。到目前为止 ,要利用这些储藏的煤中的大部分的前景似乎还很遥远 ,因为开采成本太高 ,而且又出现了更加便宜、更加干净的能源。但是 ,地下煤气化技术有可能会改变所有这一切。澳大利亚政府研究机构 Cs I Coal reserves worldwide are much higher than oil and gas. There are trillions of tons of unused coal in the world. So far, the prospect of using most of these stored coal seems far behind because of the high cost of extraction and the emergence of cheaper and cleaner energy sources. However, underground coal gasification technology is likely to change all this. Australian government research institute Cs I