石油地质与工程2025，Vol.39Issue(3)：41-47,7.
滞留烃对页岩生气潜力及碳同位素的影响
Effect of retained hydrocarbons on shale gas generation potential and carbon isotopes
摘要
Abstract
In light of the isotopic anomalies in shale gas that differ from conventional natural gas,low-ma-turity Maoming oil shale was selected to conduct semi-closed system hydrocarbon generation and expulsion simulation experiments to obtain expelled hydrocarbons and retained hydrocarbons.Subsequently,gold tube closed system thermal simulation experiments were conducted on the expelled and retained hydrocarbons,and the products were subjected to quantitative and carbon isotopic analysis.The results show that:① At the same thermal maturity,the pyrolysis gas of retained hydrocarbons has lower yield,higher dryness coeffi-cient,and heavier carbon isotopic values compared with that of expelled hydrocarbons.② The carbon iso-topic value of methane increases monotonically with maturity,while the carbon isotopic values of ethane and propane exhibit two stages and can effectively reveal their source rock during the crude oil to wet gas genera-tion stages.③The mixing of pyrolysis gases from retained and expelled hydrocarbons may lead to an inverse carbon isotopic sequence.Therefore,it is necessary to comprehensively determine the genesis and source of natural gas by combining various geological and geochemical parameters.关键词
滞留烃/热模拟实验/生气潜力/碳同位素/成因判识Key words
retained hydrocarbons/thermal simulation experiments/gas generation potential/carbon iso-topes/genetic identification分类
石油、天然气工程引用本文复制引用
雷锐..滞留烃对页岩生气潜力及碳同位素的影响[J].石油地质与工程,2025,39(3):41-47,7.基金项目
广州市基础与应用基础研究项目"水对热成因固体沥青形成的影响"(2023A04J1996). （2023A04J1996）
