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时间:2019-05-21
《塔里木盆地天然气成因类型与分布规律》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第30卷第1期石油学报Vo1.30No.12009年1月ACTAPETROLEISINICAJan.2009文章编号:0253—2697(2【)09)()1—0046—05塔里木盆地天然气成因类型与分布规律刘全有金之钧王毅李剑刘文汇刘志舟(1中国石化石油勘探开发研究院北京100083;2.中国石油勘探开发研究院北京1000833.中国石油勘探开发研究院廊坊分院河北廊坊065007)摘要:塔里木盆地发育寒武一奥陶系腐泥型和三叠一侏罗系腐殖型两套烃源岩,由此决定了塔里木盆地存在来自腐殖型母质的煤型气和来自腐泥型母
2、质的油型气。通过对塔里木盆地天然气组分和碳同位素组成分析,发现塔里木盆地不同类型的天然气分布受寒武系一奥陶系的腐泥型和三叠系侏罗系腐殖型烃源岩分布范围和热演化程度的影响。煤型气主要分布在塔里木盆地的四周,主要包括库车坳陷、塔西南坳陷和塔东南坳陷,而油型气主要分布在塔北隆起、北部坳陷、中央隆起和塔西南坳陷的北部塔里木盆地油型气又可分为干酪根裂解气和原油裂解气两种。在满东地区、和田河地区和塔中地区,原油可以达到二次油气裂解程度,向塔北隆起的轮南方向原油裂解程度呈减弱趋势。关键词:塔里木盆地;煤型气;油型气;腐泥型
3、烃源岩;腐殖型烃源岩;热演化程度中图分类号:TE112.111文献标识码:AGenetictypeanddistributionofnaturalgasinTarimBasinLIUQuanyou’JINZhijunWANGYiLIJianLIUWenhuiLIUZhizhou(1.SinopecResearchInstituteofPetroleumExplorationandProduction,Beijing100083,China;2.PetroChinaExplorationandDevelopme
4、ntResearchInstitute,Beijing100083,China;3.LongfangBranchofPetroChinaExplorationandDevelopmentResearchInstitute,Langfang065007,China)Abstract:TherearetwosetsofeffectivesourcerocksinTarimBasin,includingCambrian-OrdoviciansapropelicmattersandTriassic—Jurassich
5、umics.Thespatialdistributionandthethermalmaturityoftwosetsofeffectivesourcerockscontrolledthegenetictypeandregionaldistributionofnaturalgas.TwogenetictypesofnaturalgasinthebasincanbeclearlyidentifiedaccordingtOthecarboniso—topecompositionofmethaneanditshomo
6、logue,namelyoiltypegasandcoal—typegas.Generally,thecoal—typegasisderivedfromthehumicmatters,whereastheoiltypegasstemsfromthesapropelics.Thecoal—typegasispreservedinthetrapsalongthemarginofthebasin,includingKuqaDepression,SouthwestDepressionandSoutheastDepre
7、ssion,whiletheoil—typegasismainlydistribu—tedinTabeiUplift,NorthDepression,CentralUpliftandthenorthernpartofSouthwestDepression.Basedonthetheoreticalandempiricalcarbonisotopefractionationpatterns,theoil—typegascanbefurtherdividedintotheprimarygasandoil—crac
8、kinggas.TheprimarygasgeographicallylimitsinTabeiUplift,whileoilaccumulatedinLunnan,Mandong,HetianheandTazhongattributestOthesecondarycracking.Thedistributionofdifferentoil—typegasgreatlydependsonthethe
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