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1、礦物巖石地球化學(xué)通報·研究成果·BulletinofMineralogy,PetrologyandGeochemistryVo1.33No.3,May,2014自生綠泥石及其對儲層物性影響研究以鄂爾多斯盆地西南緣延長組為例陳寶贅,李榮西,梁積偉,黃克洲。1。長安大學(xué)地球科學(xué)與資源學(xué)院,西安7l0054;2.陜西礦業(yè)開發(fā)工貿(mào)公司,西安710054;3.陜西省地礦勘查局漢中地質(zhì)大隊,陜西漢中723000摘要:自生綠泥石是砂巖油層中常見的黏土礦物,對儲層物性影響較大,了解其在砂巖中的賦存狀態(tài)、形成環(huán)境、形成條件及物質(zhì)來源對儲層研究有重要意義。對鄂爾多斯盆地西南緣延長組砂巖薄片鑒定、掃描電鏡
2、微觀圖像觀察以及黏土礦物x衍射定量分析的研究表明,砂巖中自生綠泥石依據(jù)產(chǎn)狀、成因、物質(zhì)來源和形成溫度可劃分為3個世代,按形成時間的早晚分別為包膜綠泥石、襯里綠泥石和玫瑰花狀綠泥石。外部流體影響的砂巖中除具有上述3個世代的自生綠泥石外,還存在大量絨球狀或蜂窩狀綠泥石,是由高嶺石、蒙脫石等黏土礦物在外部流體作用下快速轉(zhuǎn)化形成的。關(guān)鍵詞:自生綠泥石;世代;自生石英;儲層物性中圖分類號:P618.13O.2文獻(xiàn)標(biāo)志碼:A文章編號: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.a(chǎn)rthScience&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