模拟实验中正庚烷与甲苯的TSR行为差异
发布时间:2018-04-16 02:31
本文选题:正庚烷 + 甲苯 ; 参考:《地球化学》2017年02期
【摘要】:高成熟度条件下,热作用和热化学硫酸盐还原反应(TSR)会强烈影响天然气的化学和同位素组成,这给气藏的气源对比带来很大的困难。考虑到TSR发生的温度与凝析油大量形成的阶段吻合,本研究选择正庚烷和甲苯两种C_7化合物在程序升温条件下开展模拟实验,重点关注轻烃中不同结构烃类的TSR行为差异,以及热作用和TSR对天然气组成的不同影响。实验结果表明:首先,甲苯在高温下可发生强烈TSR反应,地质条件下芳香烃的TSR过程可能不容忽视;其次,TSR反应导致气态烃碳同位素显著变重(480℃以下);最后,从对照组与实验组的甲烷产率与碳同位素差异来看,本研究中甲烷并未直接参与TSR反应,甲烷的化学变化更多的是TSR反应通过影响更高碳数烃类(甲烷前体物)来实现的。这些认识可以为地质条件下评估轻烃的TSR行为提供参考,有助于进一步提高热作用和TSR作用对天然气不同影响的理解。
[Abstract]:Under high maturity conditions, thermal and thermochemical sulfate reduction reactions (TSRs) strongly affect the chemical and isotopic composition of natural gas, which makes the gas source correlation of gas reservoirs very difficult.Considering that the temperature of TSR coincides with the stage of condensate formation, we selected n-heptane and toluene to carry out simulation experiments under programmed temperature, focusing on the difference of TSR behavior of hydrocarbons with different structures in light hydrocarbons.And the different effects of thermal action and TSR on the composition of natural gas.The experimental results show that, first, toluene can react strongly with TSR at high temperature, and the TSR process of aromatic hydrocarbons may not be ignored under geological conditions; secondly, the carbon isotopes of gaseous hydrocarbons become significantly heavier below 480 鈩,
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