煤岩热模拟产物演化特征与煤层气形成关系  

Relation between thermal simulation evolution characteristics of coal and formation of coal bed gas

作　　者：高岗[1] 康莉[2] 刘敬明[3] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油新疆油田公司风城油田作业区,新疆克拉玛依834000 [3]中国石油新疆油田公司开发公司,新疆克拉玛依834000

出　　处：《油气地质与采收率》2012年第6期33-36,113,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家重点基础研究发展计划"973"项目"中低丰度天然气藏形成机理"(2007CB209503)

摘　　要：为探讨煤岩中煤层气的热演化特征,选取柴达木盆地侏罗系未成熟煤岩样品进行加水热模拟实验,分析了煤岩气、液态产物及固体有机质的热演化特征。实验结果表明,气态烃可以形成于煤岩热演化的各个阶段,液态烃主要在生油窗范围内生成且生成量相对低。生油高峰时烃类气体中甲烷产率较低,之后迅速增加;重烃气体在大量生油阶段和高成熟阶段早期产率相对较高,之后开始降低。非烃类气体中二氧化碳的体积分数明显高于氮气的体积分数,均主要形成于生油阶段;氢气的体积分数普遍较高,随温度升高先降低后增高,最小值出现于生油高峰之后。煤岩能够生成气态烃和液态烃,总体具有较高的甲烷产率,远高于一般煤层实测的含气量,具备形成煤层气的物质基础。In order to discuss the thermal evolution features of coal bed gas through the hydrous thermal simulation experiments of the selected Jurassic coal samples of Qiadam Basin,the authors analyzed the evolution characteristics of liquid oil and gas production.The experimental results indicated that gaseous hydrocarbons were generated in thermal evolution stages and liquid oil was produced in oil window range and had a lower yield.At the oil-generating peak,the methane relative content is lower,a little higher before,and rising rapidly after the peak.Heavy hydrocarbon gas relative content is higher at oil-generating stage and early high mature stage and decrease later.In nonhydrocarbons,the carbon dioxide relative content is clearly higher than nitrogen's and is mainly generated at the stage of liquid oil formation.The hydrogen gas relative content is higher,and first increases and then decreases with temperature rising and its minimum value appears after oil-generating peak.The Jurassic coal sample overall has high methane yield,much more than the measured gas content of general coal,and functions as the foundation for the coal-derived gas generation and conventional reservoir gas.

关 键 词：煤岩 加水热模拟 气态产物 液态产物 煤层气 

分 类 号：TE112.3[石油与天然气工程—油气勘探]