中文摘要：

在碳酸盐水库的 H2S 富有的气体通常被归因于 thermochemical 硫酸盐减小(TSR ) 。在这篇论文， CH4-MgSO4-H2O 的反应系统的热模拟实验在 425 度 C-525 度 C 用压热器被执行。为开始 TSR 的阀值温度比我们的以前的研究(550 度 C ) 低得多。产物的性质被微电量分析分析，煤气层析(GC ) ， Fourier 变换红外线的 spectrometry (英尺红外) 和 X 光检查衍射(XRD ) 方法。TSR 过程的热力学和反应动力学根据试验性的数据被调查。有甲烷的硫酸镁的 thermochemical 减小能自发地继续作为主要产品生产氧化镁，氢硫，和二氧化碳的结果表演，和高温度是对反应有利的热力学的联盟者。根据反应模型的意见， TSR 的计算活化能是 101.894 kJ/mol，它由大多数以前的研究是比那低的。Mg2+ 可能在 TSR 的过程起了催化作用的一个作用。TSR 和反应机制的基本的步尝试性地被讨论。学习能在深碳酸盐水库在对天然气的 geochemical 深度限制的解释上并且在高 H2S 气体的产生上提供重要信息。

英文摘要：

H2S-rich gas in carbonate reservoirs is usually attributed to thermochemical sulfate reduction （TSR）. In this paper, thermal simulation experiments on the reaction system of CH4-MgSO4-H2O were carried out using autoclave at 425℃--525℃. The threshold temperature for initiating TSR is much lower than our previous studies （550℃）. Properties of the reaction products were analyzed by microcoulometry, gas-chromatography （GC）, Fourier transform-infrared spectrometry （FT-IR） and X-ray diffraction （XRD） methods. Thermodynamics and reaction kinetics of TSR processes were investigated on the basis of the experimental data. The results show that thermochemical reduction of magnesium sulfate with methane can proceed spontaneously to produce magnesium oxide, hydrogen sulfur, and carbon dioxide as the main products, and high temperature is thermodynamically favorable to the reaction. Ac- cording to the reaction model, the calculated activation energy of TSR is 101.894 kJ/mol, which is lower than that by most previous studies. Mg^2＋ may have played a role of catalytic action in the process of TSR. The elementary steps of TSR and reaction mechanism were discussed tentatively. The study can provide important information on the explanation of geochemical depth limit for natural gas and on the generation of high H2S gas in deep carbonates reservoirs.