Present Researches and Prospects of the Evaluation Indicator of Biogenic Gas Source Rocks
生物气源岩评价指标研究现状及展望

Because of the special origin of biogenic gas, the evaluation of its source rocks is different from conventional hydrocarbon source rocks. The material and environmental conditions that are favorable to the generation of biogenic gas include the large amounts of quickly deposited source rocks, the low temperature evaluation stage of source rocks, the enrichment of herbs with high biological potential of methane in the original biogenesis and the closed anoxia environment, etc. The power which makes organic matter transform into biogenic gas is the combined action of methanogenic bacteria and correlated microbial flora. The indicators reflecting microbial activity and intensity, such as the counts of micro\|organisms, the gas producing experiment with simulated anaerobic fermentation, the existence and abundance of biomarkers related to the microbial activity, are favorable geochemical parameters for the evaluation of biogenic gas source rocks, and are also the research areas to be strengthened in the future.