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时间:2020-01-13
《再论有机质“接力成气”的内涵与意义.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、石油勘探与开发2011年4月PETROLEUMEXPL0RAT10NANDDEVELOPMENTVoL38No.2129文章编号:10000747(2011)02—0129—07再论有机质“接力成气—_、.”的目’、j内涵与意义赵文智,王兆云。,王红军,李永新,胡国艺,赵长毅(1.中国石油勘探与生产公司;2.中国石油勘探开发研究院)基金项目:国家重点基础研究发展规划(973)项目(2001CB209100)摘要:有机质“接力成气”重点关注烃源岩中滞留液态烃在高一过成熟阶段的生气与成藏潜力,是指随热
2、成熟度升高,干酪根降解生气转化为原油裂解生气,在主生气时机上构成接力过程。在增补生气动力学实验和气藏解剖研究基础上,研究发现:烃源岩在液态窗阶段排烃以后的滞留烃数量相当高,在高一过成熟阶段可作为有效气源灶;滞留烃裂解生气主要发生于R。值大于1.6的高一过成熟阶段;滞留烃热裂解天然气可用甲基环己烷含量进行鉴别;高成岩环境下存在天然气有效排驱的通道、动力和过程,可规模形成源外常规气藏。有机质接力成气的意义体现在3方面:①对烃源岩中滞留液态烃生气与成藏贡献的关注;②对滞留液态烃主成气时机的确定;③对高过
3、成熟阶段滞留液态烃热裂解气“源外”天然气常规成藏潜力的评价。图6表1参23关键词:有机质接力成气;内涵;生气母质;页岩气;滞留烃裂解气;勘探中图分类号:TEl22.114文献标识码:AFurtherdiscussionontheconnotationandsignificanceofthenaturalgasrelayinggenerationmodelfromorganicmaterialsZhaoWenzhi,WangZhaoyun。,WangHongjun,LiYongxin,HuGuoyi
4、,ZhaoChangyi。(1.PetroChinaExploration&ProductionCompany,Beijing100011,China;2.PetroChinaResearchInstituteofPetroleumExploration&Development,Beijing100083.China)Abstract:Thenaturalgasrelayinggenerationmodel(abbreviatedasrelaymode1)oforganicmaterialsfoc
5、usesonthepotentialofgasgenerationandaccumulationderivedfromthedispersedliquidhydrocarbonsretainedinsourcerocksduringhightoovermaturestage(R。>1.6).Itmeansthegasgenerationconvertsfromthermaldegradationofkerogentooilcrackingwiththeincreaseofthermalmatura
6、tion,anditformsrelayinggasgenerationprocessesatdifferentthermalmaturation.Accordingtothesupplementarykineticstudiesandanatomizationofdiscoveredgasreservoirs,itwasfoundthatsourcerocksstillcontainalargeamountofliquidhydrocarbonswithinoilwindowevenaftere
7、xpulsion,whichcanserveastheeffectivegassourcekitchenduringthehightoovermaturestage.Thematurityforthegaslargelygeneratedfromoilcrackingisgreaterthan1.6vitrinitereflectance(R。),andthecontentofmethylcyclohexanecanbeutilizedasaspecificindexforidentificati
8、onofsuchnaturalgas.Conventionaloutsidesourcenaturalgasreservoirswithconsiderablescalecouldbeformedduetotheexistenceofmigrationpathway,drivingforceandprocessforeffectiveexpulsionunderhighdiageneticenvironment.Thesignificanceofthenaturalgasrelay
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