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时间:2020-03-28
《大牛地气田石英次生加大特征及其对储层物性的影响.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、第36卷第5期石油窈铭沾届Vol-36.No.52014年9月PETROLEUMGEoLoGY&EXPERIMENTSep.,2014文章编号:1001-6112(2014)05—0567—07doi:10.1l781/sysydz2O1405567大牛地气田石英次生加大特征及其对储层物性的影响曲希玉,邱隆伟,宋瑶,张满利,刘冰(1.中国石油大学地球科学与技术学院,山东青岛266555;2.中国石油大庆油田第十采油厂肇州分公司,黑龙江大庆166405)摘要:以大牛地气田太原组、山西组和下石盒子组致密砂岩储层为研究对象
2、,依据石英次生加大的点状式、环边式和多期式形貌.结合流体包裹体均一温度,将石英次生加大分为3期,其中第Ⅱ期在本区发育数量最多,含有一定量的有机包裹体,第1期和第Ⅲ期见石英溶解现象。随石英次生加大期次的增加,加大边的宽度逐渐增大,对应的储层物性逐渐变差.但第Ⅲ期对应的孔隙度较前两期明显偏高。当大牛地气田的硅质胶结物含量大于3%时,将以孔隙充填为主,在第Ⅲ期石英次生加大之后,砂岩储层已完全致密化。在整体致密的背景下,碱性溶解作用形成的石英溶解型孔隙,为大牛地气田提供了大量的储集空间,是太原组二段次生孔隙的主要成因。关键词
3、:次生加大;期次;致密化;碱性溶解;大牛地气田中图分类号:TE122.23文献标识码:ACharacteristicsanditseffectonreservoirphysicalpropertyofquartzovergrowthatDaniudiGasFieldQuXiyu,QiuLongwei,SongFan,ZhangManli,LiuBing(1.FacultyofEarthSciences&Technology,ChinaUniversityofPetroleum,Qingdao,Shandong2665
4、55,China;2.ZhaozhouBranch,No.10OilProductionCompany,DaqingOilfield,PetroChina,Daqing,Heilongfiang166405,China)Abstract:ThetightsandstonereservoirsfromtheTaiyuan,ShanxiandXiashiheziFormationsoftheDaniudiGasFieldwerestudied.Inviewofthepunctatetype,zonarystructure
5、andmultistagemorphologyofquartzover-growth,andcombinedwiththehomogenizationtemperaturefluidinclusions,thequartzovergrowthweredividedintothreestages,amongwhichthestageI1wasmostdevelopedandcontainedsomeorganicinclusions.QuartzsolutionwasfoundinthestagesIand11I.Th
6、ecorrespondingreservoirphysicalpropertygraduallybecamepoorwiththeincreasingstageofquartzovergrowthandtheincreasingwidthofenlargementmargin;however,thepo—rosityofthestage11wasobviouslyhigherthanthatoftheprevioustwostages.Porefillingwasdominantwhenthecontentofsil
7、iceouscementwasover3%attheDaniudiGasField.Afterthequartzovergrowthinthestage11,sandstonereservoirsweredensifiedcompletely.Underthewholecompactbackground,alkalinitydissolutionresultedinporesofquartzsolutiontype,whichofferedreservoirspacefortheDaniudiGasField,and
8、wasthemaincauseforsecondaryporesinthesecondmemberoftheTaiyuanFormation.Keywords:secondaryenlargement;multistage;densification;alkalinitydissolution;DaniudiGasField石英次生加大是硅质胶
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