关于生物气研究中几个理论及方法问题的研究

ON SOME THEORETICAL AND METHODOLOGICAL TOPICS OF BIOGENIC GAS SYUDIES

本文主要对国内外生物气研究中存在的几个理论及方法问题进行讨论，作者认为，自然界生物气的形成途径（ＣＯ＿２还原作用或乙酸作用形成甲烷）主要取决于沉积环境、埋藏深度、气候及地质年龄等多种因素的综合作用，生物气的鉴别δ￣（１３）Ｃ＜一５５％和是很有代表性的指标，对于生物气源岩的有机质类型的分析、划分和评价，作者认为不能完全沿用油气地质研究中的传统概念和方法。

As viewed with some theoretical and methodological topics of biogenic gas studies at home and abroad,the authors suggest that the formation of biogenic gases in the nature(by the reduiction of CO_2 or methane formed by the fermentation of acetic acid)should be dominated by combining factors,such as sedimentary environment,burial depth,climate and geological ages etc.,and the criteria of δ￣(13)C less than一55%and less than 0.5% could be reasoi1able indexes for the identification of biogenic gases.As for the analysis,subdivision and evaluation on the types of organic matter of biogenic gas source rocks,the authors of this paper donot believe that the traditional concept and method used in petroleum genlogical studies can continue to be fully used.