碳酸盐岩储集层含H2S天然气成因研究  

Study on the Genesis of H_2S-Bearing Natural Gas in Carbonate Reservoirs

作　　者：丁康乐[1] 李术元[1] 岳长涛[1] 钟宁宁[2] 

机构地区：[1]中国石油大学重质油国家重点实验室,北京102249 [2]中国石油大学资源与信息学院,北京102249

出　　处：《新疆石油地质》2008年第4期535-538,共4页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(40472076);北京市教委共建项目(XK114140479)资助

摘　　要：对天然气-固态硫酸钙体系进行了初步恒温热模拟实验研究,探讨了反应途径和热力学特征。结果表明,高温下天然气与固态硫酸钙可以发生明显的硫酸盐热化学还原反应(TSR),产物主要为硫化氢、二氧化碳、碳酸钙、水和焦炭。随TSR程度加深,天然气中总烃所占比例呈递减趋势,天然气干燥程度与酸化程度均增大。给出了天然气参与TSR的反应途径通式并进行了热力学分析。热力学上长链烷烃比短链烷烃更容易与固态硫酸钙发生TSR.以川东北飞仙关组鲕滩高H2S天然气藏为例进行了TSR体系的地质实例研究,发现模拟实验结果与实际地质例证结论基本一致。Isothermal simulation experiments on natural gas-solid calcium sulfate system have been carried out under high temperature and high pressure, and possible reaction pathways and thermodynamic characteristics of thermochemical sulfate reduction （TSR） have been discussed. The results show that hydrogen sulfide, carbon dioxide, calcium carbonate, water and carbon are the main products in the TSR system. With increasing TSR, the total hydrocarbon amount in＂ natural gas decline, and the gas dryness and gas souring index increase. The general reaction expression for TSR involving natural gas and a thermodynamic analysis of TSR system are given. Long- chain hydrocarbons take priority of reaction with solid calcium sulfate over short-chain hydrocarbons. Feixianguan formation oolitic shoal high H2S natural gas pool in northeastern Sichuan basin is taken as an example for geologic case studies of TSR system. It is found that the results from simulation experiments basically coincide with the geologic case studies.

关 键 词：碳酸盐岩储集层 天然气 固态硫酸钙 热模拟实验 TSR 硫化氢 

分 类 号：TE112.221[石油与天然气工程—油气勘探]