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《塔中顺托果勒低隆区柯坪塔格组长石溶蚀及对储层的影响.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、第37卷第3期石油褒骀沾届Vol_37.No.32015年5月PETRoLEUMGEoLoGY&EXPERIMENTMay,2015文章编号:1001-6112(2015)03-0293-07doi:10.7603/s40972—015-0045-z塔中顺托果勒低隆区柯坪塔格组长石溶蚀及对储层的影响赵姗姗,张哨楠,万友利(1.西南石油大学油气藏地质及开发工程国家重点实验室,成都610500;2.西南石油大学地球科学与技术学院,成都610500;3.中国地质调查局成都地质调查中心,成都610081)摘要:铸体薄片镜下
2、观察显示,塔里木盆地顺托果勒低隆区志留系柯坪塔格组致密砂岩储层现存孔隙类型主要为残余原生粒问孔,其次为长石溶蚀所形成的次生孑L隙。综合利用薄片、扫描电镜、能谱分析、x一射线衍射等分析手段,对长石溶蚀特征、溶蚀机制及对储层物性的影响进行研究。结果表明:钾长石溶蚀形成的次生孔隙比重较大,斜长石较少,而钠长石几乎未被溶蚀。泥盆纪早期—侏罗纪末期为研究区柯坪塔格组致密砂岩储层长石溶蚀形成次生孔隙的主要时期,该时期以钾长石的溶蚀为主,溶蚀形成的次生孔隙仅在未被沥青包覆的局部较为发育。溶蚀产物主要为伊利石及伊/蒙混层,虽然能在
3、一定程度上阻碍石英次生加大。但大大降低了砂体储层孔喉间的连通性,对储层渗透率影响很大。关键词:长石溶蚀;次生孑L隙;致密砂岩;柯坪塔格组;顺托果勒低隆;塔里木盆地中图分类号:TEl22.2文献标志码:AFeldspardissolutionanditsefectonreservoirinKepingtageFormation,ShuntuoguoleLowUplift,centralTarimBasinZhaoShanshan,ZhangShaonan,WanYouli(1.StateKeyLaboratoryof
4、OilandGasReservoirGeologyandExploitation,SouthwestPetroleumUniversity,Chengdu.Sichuan610500,China;2.SchoolofGeoscienceandTechnology,SouthwestPetroleumUniversity,Chengdu,Sichuan610500,ina;3.ChengduCentre,inaGeologicalSurvey,Chengdu,Sichuan610081。ina)Abstract:Th
5、insectiondatashowedthatprimaryintergranularporesweredominantinthetightsandstonereservoirsintheSilurianKepingtageFormationintheShuntuoguoleLowUpliftoftheTarimBasin,whilesecondaryporesformedbyfeldspardissolutiontookthesecondplace.Thefeldspardissolutioncharacteri
6、stics,mechanismanditseffectonreservoirphysicalpropertywereanalyzedusingthinsections,scanningelectronmicroscopy(SEM),energyspectrumandX-raydiffraction(XRD).Theproportionofsecondaryporosityformedbypotassiumfeldspardissolutionwasmuchlargerthanthatfromplagioclase,
7、andalbitewasalmostnotdissolved.FromtheearlyDevoniantothelateJurassic,potassiumfeldspardissolutionresultedintheformationofsecondaryporosity,andthesecondaryporesonlydevelopedintheareanotcoveredbyasphalt.Dissolutionproductsweremainlyilliteandthemixtureofillite/sm
8、ectite,althoughtheycouldhindersecondaryquartzovergrowthtosomeextent,greatlyreduceconnectivityamongtheporethroatsofthesandbodyreservoir,andgreatlyinfluencethereservoirpermeability.K
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