本文選題：正庚烷 + 甲苯��； 參考：《地球化學》2017年02期

【摘要】：高成熟度條件下,熱作用和熱化學硫酸鹽還原反應(yīng)(TSR)會強烈影響天然氣的化學和同位素組成,這給氣藏的氣源對比帶來很大的困難�？紤]到TSR發(fā)生的溫度與凝析油大量形成的階段吻合,本研究選擇正庚烷和甲苯兩種C_7化合物在程序升溫條件下開展模擬實驗,重點關(guān)注輕烴中不同結(jié)構(gòu)烴類的TSR行為差異,以及熱作用和TSR對天然氣組成的不同影響。實驗結(jié)果表明:首先,甲苯在高溫下可發(fā)生強烈TSR反應(yīng),地質(zhì)條件下芳香烴的TSR過程可能不容忽視;其次,TSR反應(yīng)導致氣態(tài)烴碳同位素顯著變重(480℃以下);最后,從對照組與實驗組的甲烷產(chǎn)率與碳同位素差異來看,本研究中甲烷并未直接參與TSR反應(yīng),甲烷的化學變化更多的是TSR反應(yīng)通過影響更高碳數(shù)烴類(甲烷前體物)來實現(xiàn)的。這些認識可以為地質(zhì)條件下評估輕烴的TSR行為提供參考,有助于進一步提高熱作用和TSR作用對天然氣不同影響的理解。
[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，

本文編號：1756934