论文详情

四川盆地天然气的碳同位素特征

石油实验地质

2001年 23卷第2期

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Title

CARBON ISOTOPE CHARACTERISTICS OF NATURAL GAS IN THE SICHUAN BASIN, CHINA

作者

戴金星夏新宇卫延召陶士振

Authors

DAI Jin-xing XIA Xin-yu WEI Yan-zhao TAO Shi-zhen

单位

中国石油勘探开发研究院, 北京 100083

Organization

Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, Beijing 100083, China

摘要

四川盆地发育10多个产气层系、6套主要气源岩。文中研究了不同地区不同产层的碳同位素组成特征。大多数气样的δ13C具有正碳同位素系列(δ13C1<δ13C2<δ13C3<δ13C4),显示出有机成因特征。一些样品中甲乙烷碳同位素倒转(δ13C1>δ13C2)可能是由于不同源岩或不同成熟度的气混合的结果。盆地中相同成熟度油型气的δ13C比煤成气的轻。CO2的δ13C也具有生物成因的特征。

Abstract

There are over ten gas producing beds and six main gas-generating rock intervals in the Sichuan Basin in the middle of China. In this paper, carbon isotopic data of natural gas from different regions and reservoirs were studied. The δ13C value of most gas samples show the pattern of δ13C1<δ13C2<δ13C3<δ13C4, indicating their biogenic origin. Samples with δ13C1>δ13C2 might be a mixture of gases from different source rocks or of different maturity. The δ13C value of humic gas is more negative than that of sapropelic gas. The δ13C value of the analyzed CO2 indicates it is of biogenic origin.

关键词：

天然气; 碳同位素组成; 四川盆地;

Keywords:

natural gas; carbon isotope composition; the Sichuan Basin;

基金项目

DOI

https://doi.org/10.11781/sysydz200102115