一、生物气及意义生物气是指沉积物中的有机质在还原环境下经厌氧微生物作用所形成的富甲烷气体。过去人们认为,生物气易于浅层沉积物中生成,但也易于散失,难于大量聚集,因此没有重要的成矿意义。近20年的天然气勘探实践和理论研究 1. Biogas and Significant Biogas refers to the methane-rich gas formed by the anaerobic microorganisms in the organic matter in the sediment under the reducing environment. In the past, people thought that biogas was easy to generate in shallow sediments, but it was also easy to dissipate, and it was difficult to accumulate in large quantities, so there was no important significance for metallogenesis. Natural gas exploration practice and theoretical research in the past 20 years