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1、石油勘探與開發(fā)2012年12月PETRoLEUMEXPLORATIoNANDDEVEL0PMENTVl01
2、39NO.6681文章編號:1000.0747(2012)06.0681-10四川盆地中南部寒武系地層劃分對比與沉積演化特征李偉,余華琪,鄧鴻斌2(1.中國石油勘探開發(fā)研究院;2.中國石油西南油氣田公司)基金項目:中國石油勘探開發(fā)研究院科技攻關項目“深部油氣藏形成條件與重大選區(qū)研究”(2008KT-01)摘要:在層序地層學理論指導下,通過對大量單井及野外露頭資料的分析,依據(jù)巖性、電性、古生物特征等,確定川中、川南寒武系各層組的對應關系,提出川中一JJ』南寒武系地層劃分與對比的新
3、方案,并以此為基礎,研究四川盆地中南部寒武紀不同時期的沉積相特征。研究表明,川南九老洞組基本對應川中的筇竹寺組,川南遇仙寺組基本對應川中滄浪鋪組、龍王廟組、高臺組,川南與Jl『中洗象池群基本對應。川中一川南寒武系自下而上分為筇竹寺組、滄浪鋪組、龍王廟組、陡坡寺組和洗象池群,長期受加里東運動形成的古隆起控制和影響,經歷了濱岸一陸棚、局限臺地一蒸發(fā)坪一陸棚溻湖、局限臺地等3個演化階段。龍王廟組和洗象池群的砂屑白云巖、鮞粒白云巖、巖溶白云巖等是該區(qū)碳酸鹽巖油氣資源勘探的目標。圖7表1參35關鍵詞:四川盆地;寒武系;地層劃分對比;沉積相;沉積演化中圖分類號:TEl21.34文獻標識碼:ASt
4、ratigraphicdivisionandcorrelationandsedimentarycharacteristicsoftheCambrianincentra1.southernSichuanBasinLiWei,YuHuaqi,DengHongbin(1.PetroChinaResearchInstituteofPetroleumExploration&Development,Beijing100083,China;2.PetroChinaSouthwestOilandGasFieldCompany,Chengdu610051,China)Abstract:Underthe
5、guidanceofsequencestratigraphyandthroughanalysesoflargeamountsofwellandoutcropdata,thecOHespondenceofallformationsintheCambrianofsouthernandcentralSichuanBasinisdefinedandanewschemeofstratigraphicdivisionandcorrelationfortheCambrianincentral·southernSichuanBasinisproposedbasedonthecharacteristi
6、csoflithology,loggingcurvesandfossils.TheJiulaodongFormationinsouthemSichuanBasiniscorrespondingroughlytotheQiongzhusiFormationincentralSichuanBasin,theYuxiansiFormationinsouthernSichuanroughlytotheCanglangpu,LongwangmiaoandGaotaiformationsincentralSichuanBasin,theXixiangchiGroupinsouthernSichu
7、anroughlytothesamegroupincentralSichuan.TheCambrianincentral—southernSichuanBasinisdividedintotheQiongzhusiFormation,CanglangpuFormation,LongwangmiaoFormation,DouposiFormationandXixiangehiGroupfrombottomtotop.Onthebasisofthat,sedimentaryfaciesoftheCambrianwasstudied.Controlledandimpactedbythepa
8、leo-upliftsformedbyCaledonianOrogeny,thedepositionoftheCambrianexperiencedthreeevolutionarystages:shore-continentalshelf,restrictedplatform-evaporationfiat-shelflagoon,restrictedplatform.Thesandy,ooliticandcarstdolomitesintheLongw