生物成因稠油与伴生气形成过程模拟研究——以林樊家地区浅层气和稠油为例

发布时间：2018-03-12 17:00

  本文选题：原油　切入点：微生物降解　出处：《油气地质与采收率》2017年02期 　论文类型：期刊论文

【摘要】：原油厌氧微生物降解是形成稠油与伴生气藏的主要原因之一。为研究原油厌氧微生物降解形成稠油与伴生气的过程,以林樊家地区浅层气和稠油为研究对象,利用厌氧微生物降解菌群对与研究区稠油具有相同烃源岩的稀油进行原油微生物降解模拟实验。结果表明:稀油经厌氧微生物降解可以形成稠油,同时还生成甲烷和二氧化碳,降解248 d平均每克原油能够生成3 mmol甲烷和0.5 mmol二氧化碳,分析所生成的气体碳同位素,发现甲烷δ13C1值为-46.36‰~-45.27‰,二氧化碳δ13C1值为4.24‰~8.5‰,利用碳同位素数据计算出林樊家地区浅层气中生物降解气含量达69%;原油饱和烃含量由初始的72.77%下降到44.0%,饱和烃含量大幅下降是原油稠化的主要原因。典型生物标志物25-降藿烷/藿烷值显著升高,由0.009上升到0.056,表明原油发生了严重的生物降解。原油微生物降解模拟实验可以在室内较短时间内模拟完成原油的微生物降解过程。
[Abstract]:Anaerobic microbial degradation of crude oil is one of the main reasons for the formation of heavy oil and associated gas reservoirs. In order to study the process of crude oil anaerobic microbial degradation to form heavy oil and associated gas, the shallow gas and heavy oil in Lifangjia area were studied. The microbial degradation simulation experiment of crude oil with the same hydrocarbon source rock was carried out by anaerobic microbial degradation microflora. The results showed that the thin oil could be degraded by anaerobic microorganism to form heavy oil, and also to produce methane and carbon dioxide. On average, 3 mmol methane and 0.5 mmol carbon dioxide can be produced per gram of crude oil degraded for 248d. The results show that the 未 13C1 value of methane is -46.36 鈥，

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