不同热模拟实验煤热解产物特征及动力学分析  

Characteristics and kinetic of coal pyrolysates with different thermal simulation apparatuses

作　　者：王民[1,2,3] 卢双舫[1,2] 王东良[4] 董奇[1] 刘敏[1] 王雪飞[1] 

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]东北石油大学油气藏形成机理与资源评价省重点实验室,黑龙江大庆163318 [3]北京大学地球与空间科学学院,北京100871 [4]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《石油学报》2011年第5期806-814,共9页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.40972101);国家重点基础研究发展规划(973)项目(2009CB219306);国家科技重大专项(2008ZX05007-001)联合资助

摘　　要：利用Rock-Eval-Ⅱ型热解仪、TG-MS(热失重—质谱联用仪)及金管装置对松辽盆地沙河子组煤样进行了热模拟实验。TG-MS实验中甲烷生成温度对应的Ro与地质条件下气态烃产物生成时的成熟度接近,而Rock-Eval-II实验中烃气生成时对应的Ro要远小于地质条件下气态烃产物生成时对应的成熟度。TG-MS实验中煤生甲烷终止温度约为850℃,对应的Ro约为5.3%(10℃/min升温速率)。金管实验650℃时(Ro约为4.9%,升温速率2℃/h)煤生气能力尚未结束,气态烃质量产率一直呈增长趋势,同时高温阶段密闭体系中甲烷的来源主要是有机质的初次裂解。煤生气动力学参数在徐家围子地区的应用结果表明,不同生烃装置热裂解实验下获得的动力学参数外推结果差别很大,建议采用TG-MS实验装置模拟地质条件下烃源岩边生气边排出的情况,采用金管装置热裂解实验模拟存在二次裂解的封闭体系下的生气情况。Coal samples from the Shahezi Formation in the Songliao Basin were pyrolyzed by means of Rock-Eval II,TG-MS（thermogravimetry-mass spectrometry） and gold tube apparatuses,respectively,in order to investigate characteristics and kinetic behaviors of their pyrolysates.Comparative results of pyrolysate yields revealed that the Ro corresponding to methane generation under TG-MS apparatus conditions was close to the maturity value of gaseous hydrocarbons generated under geological conditions,while the maturity of methane generation under Rock-Eval II experiment conditions was much lower than the Ro corresponding to gaseous generation under geological conditions.The termination temperature of methane generation from the coal sample under the TG-MS experiment was about 850℃（at a heating rate of 10℃/min）,and the corresponding Ro was about 5.3% calculated with the extended Easy Ro% model.However,the C1-5 mass yields increased all the time while even at the terminal temperature in the gold tube experiment（with the corresponding Ro of 4.9%,at a heating rate of 2℃/hour and the terminational temperature is about 650℃）,indicating a gas-generative potential of the coal sample at higher maturity and the primary cracking of organic matter as the major source of methane in a closed system at this high temperature stage.It might be the recombined reaction of C6＋ liquid hydrocarbons with kerogen or bitumen in a closed environment that formed some new products with high thermal stability,which then generated methane at even higher temperature stage.For an open system,such as in the TG-MS experiment and Rock-Eval experiment,this recombined reaction could not take place because C6＋ liquid components were removed immediately with the carried gas.The geological application of kinetic parameters of gas generation from coals in the Xujiaweizi area showed that a great difference existed in the extrapolation of kinetic parameters obtained from different pyrolyzed apparatuses.Based on these data,the TG-MS apparatuses wa

关 键 词：岩石热解 热失重—质谱 金管 动力学 沙河子组 

分 类 号：TE125.2[石油与天然气工程—油气勘探]