摘要
近年在我国陆相地层中相继发现了一些含凝析油的天然气气藏,其成因为生物和低温热解作用形成。气源岩主要为腐殖型,埋深在3000m以内。位于低成熟带.气的成分以甲烷为主,δ～(13)C_1=-45‰～-55‰,δD_(CH)_4=-200‰～-263‰。我国中新生代地层发育,变质程度较低,具备生物一低温热解气成藏的有利条件。
In recent years, a number of condensate-bearing gas reservoirs originating from biological activity and low-tempcrature thermolysis were successively found in the strata of continental facies in China. The source rocks buried in less than 3000m at the lower-mature zone mainly contain organic matters of humic type. The gas composition is mainly methane, δ^(13)C_1=-45‰^-55‰, δD_(CH_4)=-200‰ ^-263‰. The lower metamorphic grade Mesozoic-Cenozoic strate developing in our country possess the favourable conditions to form biological activity and lower temperature thermolysis gas reservoirs.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1991年第1期1-5,共5页
Natural Gas Industry
关键词
天然气
热解
生物
type of natural gas
genesis
biological activity
lower temperature thermolysis.
