摘要
监利市长江北岸边一水田中有大量气体逸出,通过进行天然气组分和碳同位素分析。结果表明,气体中CH_(4)含量在2.35%~3.71%之间、不含C_(2)H_(6)及以上重烃成分、干燥系数(C_(1)/C_(1-5))为1,属典型干气;δ^(13)C_(1)值介于-93.62‰~-93.38‰之间、明显偏负,研究认为属于氢气还原二氧化碳形成的浅层生物气。从生气层、储层、盖层等几个方面研究,认为研究区具有生成浅层生物气的地质条件。
A large amount of gas is escaping from paddy fields along the north bank of the Yangtze River in Jianli City.To determine the gas source and genesis,natural gas composition and carbon isotope analyses were conducted.Results show that methane(CH_(4))content ranges from 2.35%to 3.71%,with no ethane(C_(2)H_(6))or heavier hydrocarbons detected.The dryness coefficient C_(1)/C_(1-5) equals 1,indicating typical dry gas.Theδ^(13) C_(1) values range from-93.62‰to-93.38‰,showing a highly negative carbon isotope signature,suggesting that the gas was formed through CO?reduction by hydrogen,typical of shallow biogenic gas.From the perspectives of gas-generating layer,reservoir,and cap rock,the study concludes that the area possesses favorable geological conditions for the generation and accumulation of shallow biogenic gas.
作者
冯志平
刘明
李凯
徐杨
FENG Zhiping;LIU Ming;LI Kai;XU Yang(Research Institute of Exploration&Production,Sinopec Jianghan Oilfield Company,Wuhan,Hubei 430223,China)
出处
《江汉石油职工大学学报》
2025年第6期10-12,共3页
Journal of Jianghan Petroleum University of Staff and Workers
关键词
浅层生物气
第四系
监利
地化特征
shallow biogenic gas
Quaternary
Jianli
geochemical characteristic
