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时间:2020-03-26
《自生绿泥石及其对储层物性影响研究——以鄂尔多斯盆地西南缘延长组为例.pdf》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、矿物岩石地球化学通报·研究成果·BulletinofMineralogy,PetrologyandGeochemistryVo1.33No.3,May,2014自生绿泥石及其对储层物性影响研究以鄂尔多斯盆地西南缘延长组为例陈宝赘,李荣西,梁积伟,黄克洲。1。长安大学地球科学与资源学院,西安7l0054;2.陕西矿业开发工贸公司,西安710054;3.陕西省地矿勘查局汉中地质大队,陕西汉中723000摘要:自生绿泥石是砂岩油层中常见的黏土矿物,对储层物性影响较大,了解其在砂岩中的赋存状态、形成环境、形成条件及物质来源对储层研究有重要意义。对鄂尔多斯盆地西南缘延长组砂岩薄片鉴定、扫描电镜
2、微观图像观察以及黏土矿物x衍射定量分析的研究表明,砂岩中自生绿泥石依据产状、成因、物质来源和形成温度可划分为3个世代,按形成时间的早晚分别为包膜绿泥石、衬里绿泥石和玫瑰花状绿泥石。外部流体影响的砂岩中除具有上述3个世代的自生绿泥石外,还存在大量绒球状或蜂窝状绿泥石,是由高岭石、蒙脱石等黏土矿物在外部流体作用下快速转化形成的。关键词:自生绿泥石;世代;自生石英;储层物性中图分类号:P618.13O.2文献标志码:A文章编号:10072802(2014)030389—06doi:10.3969/j.issn.1007—2802.2014.03.014AuthigenicChloritea
3、nditsImpactiononReservoirPhysicalProperties:AnExamplefromtheYanchangFormationoftheSouthwestOrdosBasinCHENBao—yun’。,LIRong—xi,LIANGji—wei。HUANGKe—zhou。1.Schoolo/F.arthScience&Resources,Chang’anUniversity,Xi’an710054.China:2.Sha.nxiMiningIndustry&TradeCompany,Xi’an710054,China:3.HanzhongGeologica
4、lTeamofShaanxiBureauo/GeologyandMineralResources,Hanzhong,Shaanxi723000,ChinaAbstract:Authigenicchloritewhichhassignificantimpactonreservoirisanimportantpartofclaymineralsinsand—stonereservoirs.Theresearchesonoccurrence,genesis,sourceandgrowingenvironmentofthechloritemayhelptounderstandthephysi
5、calpropertiesofreservoir.TheresultsofSEM,XRDandpetrographicthinsectionstudiesindicatedthat,accordingtoitsoccurrence,genesis,sourceandtemperature,theauthigenicchloriteinnormalsand—stonereservoirscanbedividedintothreegenerations,theyaregraincoating,pore—liningandrose—likechloriteonthetimeorder.Be
6、sidesthethreegenerationschlorites,theexterna1fluidsinfluencedsandstonereservoirsalsoyieldhoneycombandbobblelikechlorites,whichareauthigenicchloriteswithnogenerationfeatures.Graincoatingandpore—liningchloriteshaveapositiveimpactonthereservoirphysicalpropertiesbyoccupyingthebasementofquartz,keepi
7、ngalkalineporeenvironlnentandconsumptionofthebasisforquartzcrystallizationtoprotecttheprimarypores.Butrose—like,honeycomborbobble—likechloriteshavenegativeimpactonthereservoirphysicalpropertiesthroughfillingthepores.Keywords:authi
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