中国有机烷烃气碳同位素系列倒转的成因

doi:10.11743/ogg20030101

摘要/Abstract

摘要：

所谓烷烃气碳同位素系列是指依烷烃气分子中碳数顺序递增,δ¹³C值依次递增或递减。递增者称正碳同位素系列,递减者叫负碳同位素系列。当烷烃气的δ¹³C值不按正、负碳同位素系列规律,排列出现混乱时,谓之碳同位素系列倒转。致使倒转的原因有有机烷烃气和无机烷烃气的混合;煤成气和油型气的混合;同型不同源气或同源不同期气的混合和烷烃气中某一或某些组分被细菌氧化。倒转可由其中一种原因,也可由两种或更多种原因所致。

关键词: 有机烷烃气, 碳同位素, 倒转, 次生气, 混合气, 中国

Abstract:

The δ¹³C values change in a regular manner with the increase of hydrocarbon gas molecular weight, i.e. change in normal order or reverse order.The normal order is δ¹³C₁<δ¹³C₂<δ¹³C₃<δ¹³C₄,and the reverse order is δ¹³C₁> δ¹³C₂>δ¹³C₃>δ¹³C₄.Partly reversed order is also common in gas samples from different basins in China,such phenomenon can be attributed to one or several of the following reasons:(a)Mixing of biogenic gas and abiogenic gas;(b)Mixing of gases from sapropelic sources and humic sources;(c)Mixing of gases from two source rock intervals of the same type but of different maturity;(d)Mixing of gases from one source rock interval of varying maturity.

Key words: biogenic alkane gas, carbon isotope, reverse, secondary gas, mixing gas, China

中图分类号:

TE112.113

戴金星,夏新宇,秦胜飞,等. 中国有机烷烃气碳同位素系列倒转的成因[J]. 石油与天然气地质, 2003, 24(1): 1-6,11. doi: 10.11743/ogg20030101 Dai Jinxing,Xia Xinyu,Qin Shengfei,et al. CAUSATION OF PARTLY REVERSED ORDERS OF δ¹³ C IN BIOGENIC ALKANE GAS IN CHINA[J]. Oil & Gas Geology, 2003, 24(1): 1-6,11. doi: 10.11743/ogg20030101

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