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在来自西南奥尔多斯盆地的过度成熟的煤炭型气体中吸附诱导的负碳同位素序列

Xiaoming Wu^1,2, Qiang Meng³, Haiwei Zhu²

¹Hubei Key Laboratory of Petroleum Geochemistry and Environment, College of Resources and Environments, Yangtze University, Wuhan, 430100, China.

Scientific reports

|April 8, 2025

概括

在奥尔多斯盆地过度成熟的煤炭类型气体显示了由于煤炭吸附而导致的负碳同位素序列,挑战了传统的气体起源解释. 这一发现影响了对气体类型和源岩成熟度的分类方法.

科学领域:

地质化学地质化学
有机地化学有机地化学
同位素地质化学同位素地质化学

背景情况:

阿尔干的碳同位素序列是区分有机天然气和无机天然气的主要指标.
一个负碳同位素序列 (δ¹³C₁ > δ¹³C₂ > δ¹³ C₃ > δ¹³ C₄) 通常与无机气相联系.
在青阳气田,奥尔多斯盆地观察到异常负碳同位素序列,尽管无有机气体形成的地质条件不存在.

研究的目的:

为了调查青阳天然气田中异常碳同位素序列的原因.
重新评估传统地质化学方法的可靠性,以确定过度成熟的煤类型气体中的气体来源和成熟度.
确定这些气体系统中源岩成熟度的可靠指标.

主要方法:

对天然气地质化学特征的分析.
在高级煤炭上进行吸附/脱附实验.
评估已建立的地球化学分类和成熟度评估方法.

主要成果:

青阳天然气田的天然气被确定为来自石灰岩 - 波斯纪形成的过度成熟的煤炭类天然气.
负碳同位素序列归因于煤炭对更重的碳化合物 (C₂₊) 的优先吸附,导致它们在脱附后具有更轻的同位素特征.
根据同位素比率 (δ¹³C₂, δ¹³C₃) 和经验公式来分类气体来源 (石油与煤炭类型) 和源岩成熟度的传统方法和经验公式被发现对过度成熟的煤炭类型气体不可靠.

结论:

煤炭吸附显著影响过度成熟的煤炭型气体中基的碳同位素序列,模仿无机气体的特征.
负碳同位素序列并不是所有地质环境中无机气体的明确指标.
甲碳同位素特征 (δ¹³C₁) 和气体干燥系数 (C₁/C_1-5) 是评估过度成熟的煤类气中的源岩成熟度的可靠指标.

关键词:

吸附方式吸附方式吸附方式负碳同位素序列的负碳同位素序列有机天然气有机天然气过度成熟的煤炭型气体.青阳天然气田是一个天然气田.

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