四川盆地东北部下三叠统飞仙关组碳酸盐蒸发台地沉积相VIP免费

©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.http://www.cnki.net文章编号:1671-1505(2005)03-0357-15文献标识码:A3国家重点基础研究发展计划(973计划)项目资助(编号:2001CB209104)收稿日期:2004-11-04改回日期:2005-02-13四川盆地东北部下三叠统飞仙关组碳酸盐蒸发台地沉积相3王一刚张静刘兴刚徐丹舟师晓蓉宋蜀筠文应初中国石油西南油气田公司勘探开发研究院,四川成都610051摘要四川盆地早三叠世飞仙关早期的环境基本上继承了晚二叠世长兴期末的格局。在川东北地区演化为碳酸盐蒸发台地。飞仙关组蒸发台地为一套含硫酸盐的富白云岩的蒸发潮坪沉积层系。下部为薄层的含石膏、硬石膏晶体、团块及肠状石膏层的泥晶灰岩、微晶白云岩组成的小潮差蒸发潮坪层序。中部为层状鲕粒白云岩、鲕粒灰岩的潮下鲕粒滩相与萨布哈环境的富层状石膏岩的膏坪相、含石膏岩的膏云坪相组成的大潮差蒸发潮坪层序。上部为中薄层状富泥的含石膏质夹层的泥质泥晶灰岩、微晶白云岩组成的旋回性清楚的似蒸发潮坪层序。这三种层序的纵向组合在蒸发台地相区可以很好对比,尽管各层序厚度有明显变化。强烈白云石化的鲕粒白云岩是四川盆地飞仙关组大中型气藏的主要储层,依据鲕粒岩的相序特征可将其分为有障壁性质的台缘鲕粒坝和台内鲕粒滩两类。蒸发台地西缘的台缘鲕粒坝在飞仙关期基本稳定。东缘的台缘鲕粒坝在飞仙关中后期大幅度向盆地方向迁移。关键词沉积相碳酸盐蒸发台地萨布哈下三叠统飞仙关组四川盆地第一作者简介王一刚,女,1954年生,1982年毕业于西南石油学院石油地质勘探系,获硕士学位。现为中国石油西南油气田公司勘探开发研究院教授级高级工程师,从事石油地质与沉积学研究。通讯地址:四川省成都市建设路83号,邮编:610051。E2mail:WYG518@sina1comSedimentaryfaciesofevaporativecarbonateplatformoftheFeixianguanFormationofLowerTriassicinnortheasternSichuanBasinWangYigangZhangJingLiuXinggangXuDanzhouShiXiaorongSongShujunWenYingchuResearchInstituteofExplorationandDevelopment,PetroChinaSouthwestOilandGasfieldCompany,Chengdu610051,SichuanAbstractThesedimentaryenvironmentoftheEarlyFeixianguanAgeofEarlyTriassicinnorth2easternSichuanBasinmainlyinheritedthepatternoftheLateChanghsingianAgeofLatePermian1ThenortheasternSichuanareaisevaporativecarbonateplatform1TheFeixianguanFormationofevaporativecarbonateplatformisasetofsulfate2bearingevaporativetidalsedimentswithaboundantdolomite1Thelowerpartisamicro2tidalrangeevaporativetidalsequenceconsistingofthin2beddedgypsum2bearing,muddy2limestoneanddolomicrite1Themiddlepartisasetoflargetidalrangetidalsequenceincluding第7卷第3期2005年8月古地理学报JOURNALOFPALAEOGEOGRAPHYVol17No13Aug12005©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.http://www.cnki.netooliticshoalfacieswhichismadeupofbedded2oolitedolomiteandoolitelimestone,gypsum2tidalfaciesinsabkhaenvironmentwhichconsistsofbeddedgypsolyte,andgypsolyte2bearinggypsum2dolomitetidalfacies1Theupperpartisasetofevaporitequasi2tidalsequencewithclearcycleswhichismadeupofmiddle2thin2bedded,gypsum2bearingmuddylimestoneanddolomicrite1Verticalcombinationofthesethreesequencescanbewellcorrelatedinevaporitiveplatformareaeventhoughthicknessesofeachse2quenceareobviouslydifferent1Stronglydolomizedoolitedolomitesarethemainreservoirofmedium2largescalegasreservoiroftheFeixianguanFormationinSichuanBasin1Accordingtoitsfaciessequencefeatures,theooliticrocksaredepositedinplatformmarginalooliticbarandinner2platformooliticbank1PlatformmarginalooliticbaralongthewesternmarginoftheevaporiteplatformwasstaticduringtheFeixianguanAge,whiletheplatformmarginalooliticbaralongtheeasternmargingreatlyshiftedto2wardsthebasindur...