OALib Journal期刊
ISSN: 2333-9721
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油气藏上方土壤中甲烷氧化菌群落结构分析――以沾化凹陷某油气田为例
DOI: 10.3724/SP.J.1145.2013.00478, PP. 478-483
Keywords: 甲烷氧化菌,pmoa基因,克隆文库,群落结构,油气微生物勘探,胜利油田
Abstract:
以胜利油田沾化凹陷某油气田内油区、气区和背景区上方近地表的土壤为例,构建了甲烷氧化菌功能基因(甲烷单加氧酶基因)pmoa的克隆文库,以探讨甲烷氧化菌群落结构与地下油气藏之间的关系.对3个文库155个克隆子测序后进行比较分析,发现ⅰa型甲烷氧化菌methylobacter、methylomonas、methylomicrobium在油区土壤中所占比例分别为23%、21%和17%,在气区分别为31%、15%和16%,在背景区分别为26%、21%和8%;ⅰb型甲烷氧化菌methylococcus和methylocaldum在3个区的比例分别为29%、31%和19%;ⅱ型甲烷氧化菌methylocystis和methylosinus在油区所占比例为10%,在气区为7%,在背景区为27%.ⅰa型甲烷氧化菌在各区域分布差别不明显,ⅰb型甲烷氧化菌methylococcus和methylocaldum在油气区的丰度较高,而ⅱ型甲烷氧化菌methylocystis和methylosinus在背景区的丰度远远高于油气区.由此可知,在地质历史时期的持续轻烃供应下,长期的油气微渗漏环境可能会促使微生物群落结构产生差异,ⅱ型到ⅰ型甲烷氧化菌缓慢地演替.
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