Worldwide distribution and significance of secondary microbial methane formed during petroleum biodegradation in conventional reservoirs
Alexei V. Milkov
全球约有一半的(储层)原油和沥青遭受过生物降解。近来的研究认为,这一降解过程主要是厌氧产甲烷过程。这种储层原油降解次生生物气的全球分布及其产量目前还不是很清楚。本文的目的是提出识别原油降解次生生物气的四个标准,即(1)储层中存在原油降解,(2)天然气相对干燥,(3)甲烷碳同位素的分布为-55‰~-35‰及最为重要的(4)δ13CO2>+2‰。根据这些标准,得出全球原油降解次生生物气的分布的概率图(“明显存在”、“很可能存在”及“可能存在”,Fig 6),并粗略估算这类生物气全球潜在的储量。
Refs:
[1]Milkov, A.V., 2011. Worldwide distribution and significance of secondary microbial methane formed during petroleum biodegradation in conventional reservoirs. Organic Geochemistry 42, 184-207.