论文详情

氮气对海相地层油气保存的指示作用

石油实验地质

2005年 27卷第1期

阅读：126

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Title

NITROGEN AS AN INDEX OF OIL-GAS PRESERVATION CONDITIONS IN MARINE STRATA

作者

陈安定

Authors

Chen Anding

单位

中国石化, 江苏油田分公司, 地质科学研究院, 江苏, 扬州, 225009

Organization

Research Institute of Geosciences, Jiangsu Oilfield, SINOPEC, Yangzhou, Jiangsu 225009, China

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。

Abstract

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.

关键词：

氮气; 油气保存; 海相油气; 中国南部;

Keywords:

nitrogen; oil-gas preservation; marine oil-gas; the South China;

基金项目

DOI

https://doi.org/10.11781/sysydz200501085