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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.
The effects of aqueous media on the hydrogen isotope composition of organic thermogenic natural gas are discussed based on the hydrocarbon generation heat simulation experiments of coal and rock with anhydrous and deionized water (δDH2O = -58 ‰) and seawater (δDH2O = -4.8 ‰) And its significance.Experimental results show that the addition of water significantly increases the yield of hydrogen and CO2, and at the same time, the yield of methane in the high evolution stage also increases obviously in the water addition experiment.Aqueous media is involved in the chemical reaction of hydrocarbon evolution, Thus affecting the hydrogen isotope composition of the gaseous hydrocarbons.Three sets of experiments show a linear relationship between the methane hydrogen isotope composition and the methane yield.At the same methane production rate, , Followed by seawater plus the lightest of deionized water.The hydrogen isotope composition of natural gas is mainly affected by the following three factors: (1) the composition of hydrogen isotopes of organic matter in source rocks, (2) the degree of thermal evolution, (3 ) Paleoagnetic media during the formation of natural gas.From the experimental results, it can be seen that the paleo-water medium has little effect on the hydrogen isotopes of gaseous hydrocarbons during the formation of natural gas.