四川盆地天然气的碳同位素特征

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

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。
- 天然气 /
- 碳同位素组成 /
- 四川盆地
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.
- natural gas /
- carbon isotope composition /
- the Sichuan Basin

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