硫化氢生成模拟实验研究

STUDY ON GENERATION OF HYDROGEN SULFIDE BY SIMULATION EXPERIMENT

利用封闭体系的高压釜实验装置进行硫化氢生成的模拟实验已有报道,但硫化氢的生成量很少或很难检测到。因此研制了开放体系的石英管模拟方法,探讨了硫酸钙、硫磺、黄铁矿分别与正己烷反应生成硫化氢以及低成熟泥灰岩生烃模拟过程中硫化氢的生成特征。结果表明,硫酸钙与正己烷在高温下可以发生反应,但反应比较困难,且硫化氢的生成量较少;单质硫与正己烷在较低温度下即可发生反应,并可生成大量的硫化氢;黄铁矿与正己烷可以发生反应并生成大量的硫化氢,主要是黄铁矿高温分解形成的单质硫与烃类反应的结果。低成熟泥灰岩生烃模拟过程中能够生成大量的硫化氢与其含有较多的黄铁矿有关。硫化氢生成的成功模拟为其成因机理研究提供了重要的实验手段和依据。

A simulation experimental study on the generation of hydrogen sulfide （H2S） by using the high pressure reactor within a closed system has been conducted and reported earlier, but the H2S generated is very little, or too little to be detected. A novel quartz tube simulation method is thus developed to simulate the generation of H2S with an open system. Some chemical reagents, such as hexane, calcium sulfate, sulfur and pyrite, are used to investigate the generation of H2S in the simulation experiment; and a kind of low mature marlstone is also used to simulate the generation of H2S during the generation of hydrocarbon. The results show that calcium sulfate may react with hexane under high temperatures but not easily, and the H2S amount generated is little; the elemental sulfur can react easily with hexane under relatively low temperatures, generating large amounts of H2S; pyrite can also react with hexane and generate large amounts of H2S, mainly due to the reaction of the elemental sulfur released under high temperatures with hydrocarbons. The low mature marlstone can generate large amounts of H2S during the hydrocarbon generation simulation, because of its high content of pyrite. The successful simulation of the generation of H2S provides an important experimental basis for the study on the genetic mechanism of H2S.