摘要
列举了南方海相地层富氮天然气实例,阐述了富氮天然气分布特点,探讨了氮气来源和形成机理。指出富氮天然气主要来自生物腐烂菌解、干酪根低温热解、天然气运移、无机矿物分解和大气成因等途径。但对南方海相地层而言,富氮气体中的氮主要来自大气,它表征了地下与地表的连通程度。因此,氮气是一项直接反映油气保存条件的指标。
This paper shows some examples of gas rich in nitrogen in the marine strata of South China, explains their distribution characteristics, and discusses various source and formation mechanism of nitrogen. It is pointed out that, nitrogen in natural gas usually comes from biological detritus decomposed by (bacteria, )low temperature pyrolysis of kerogen, gas migration, nitrate-mineral decomposition and atmosphere, but nitrogen in marine strata is mainly from atmosphere. Nitrogen in natural gas indicates connection of surface with underground, therefore, it could be an effective index for oil-gas reservoir.
出处
《石油实验地质》
CAS
CSCD
北大核心
2005年第1期85-89,共5页
Petroleum Geology & Experiment
关键词
氮气
油气保存
海相油气
中国南部
nitrogen
oil-gas preservation
marine oil-gas
the South China
