论文部分内容阅读
对控制生物气成藏的诸项地质因素进行了探讨，取得了如下认识：①产甲烷菌的大量繁殖是生物气富集的关键因素，其适宜的地球化学环境为缺氧、缺硫酸根、中—中高温、较低矿化度的近中性水介质环境；②Ⅰ、Ⅱ型有机质的最佳生气温度为３５～４０℃，Ⅲ型有机质的最佳生气温度为４０～５０℃；③有机质生气潜力按Ⅰ、Ⅱ、Ⅲ型干酪根的顺序依次降低；④提出了生物气的赋存相态模式，自上而下生物气的赋存运移相态为游离态—水溶态—游离态，解释了生物气在深度上的分布规律；⑤产生物气地层具有高孔渗特征，生物气要成藏需有厚的泥岩盖层封盖保存；⑥生物气成藏是所生天然气不断生成聚集和不断纵向散失达到相对平衡的结果。
The geological factors that control biogas accumulation are discussed, and the following recognitions are obtained: (1) Massive multiplication of methanogen is the key factor of biogas enrichment, and its suitable geochemical environment is hypoxia, lack of sulfate radical, Medium-high temperature, low salinity near-neutral aqueous media environment; ② I, Ⅱ organic matter optimum biogas temperature is 35 ~ 40 ℃, Ⅲ organic matter optimum biogas temperature is 40 ~ 50 ℃; ③ organic matter The potential for gas generation decreases in turn according to the order of type I, II, and III kerogens. (4) The mode of occurrence phase of biogas is proposed, and the phase of up-down biogas is free-water-soluble-free The distribution pattern of biogas in depth; (5) the biogas formation is characterized by high porosity and permeability; biogas needs to be preserved by a thick mudstone cap and capped; (6) biogas accumulation is the result of continuous accumulation of natural gas and Continuous loss to achieve the relative balance of the results.