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水介质对气态烃形成演化过程氢同位素组成的影响

, PP. 103-110

Keywords: 水介质,天然气,氢同位素组成,热模拟实验

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Abstract:

?通过煤岩的无水、加去离子水(δDH2O=-58‰)和加海水(δDH2O=-4.8‰)三组生烃热模拟实验,讨论了水介质对有机热成因天然气氢同位素组成的影响及其意义.实验结果显示,加水实验明显增加了氢气和CO2的产率,同时,高演化阶段甲烷的产率在加水实验中也得到明显的增加.水介质参与了成烃演化的化学反应,从而影响了气态烃的氢同位素组成.三组实验中,甲烷氢同位素组成与甲烷产率之间呈线性关系.在甲烷产率相同的情况下,无水实验产出的甲烷氢同位素组成最重,加海水者次之,加去离子水的最轻.天然气氢同位素组成主要受以下三个方面因素的影响:(1)源岩有机质的氢同位素组成特征,(2)热演化程度,(3)天然气形成时期古水介质.从实验结果看,天然气形成时期古水介质对气态烃的氢同位素影响相对较小.

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