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1、維普資訊http://www.cqvip.com石油勘探與開發(fā)6002006年10月PETR()IEUMEXPI()RATI()NANDr)EVEI()PMENTVoI_33NO.5文章編號:1000—0747(2006)05060006東濮凹陷沙三段鹽巖成因蘇惠,許化政。,張金川,曲麗萍,王萍霞,曾探,李桂霞,喬朝澤(1_中國地質(zhì)大學(xué)(北京);2.中國石化中原油田勘探開發(fā)科學(xué)研究院;3.中國石化石油勘探開發(fā)研究院)基金項(xiàng)目:國家自然科學(xué)基金資助項(xiàng)目(40472073)摘要:東濮凹陷沙三段(Es。)發(fā)育鹽巖和膏鹽巖,巖,觀察見有沖
2、刷面、泥裂、波痕等淺水和暴露標(biāo)志,地震剖面顯示有低位楔、削截面、下超等湖岸線進(jìn)退現(xiàn)象,說明Ess沉積期古湖泊水體深度變化大。高水位期沉積深灰色、暗色泥巖與少量重力流砂體,低水位期沉積鹽巖、膏巖,發(fā)育低位三角洲與扇三角洲沉積.縱向形成深湖泥巖與蒸發(fā)巖、低位砂巖的頻繁互層。分析認(rèn)為,鹽巖為淺水成因,鹽源為周邊隆起的中、下奧陶統(tǒng)。這一認(rèn)識不同于過去“高山深盆”、“深水成鹽”和“海相成因”的觀點(diǎn),將給東濮凹陷沉積古地理、古環(huán)境研究帶來新的認(rèn)識。圖6表3參13關(guān)鍵詞:東濮凹陷;淺水成鹽;深水成鹽;海侵說;陸源說中圖分類號:TEl22.2文獻(xiàn)
3、標(biāo)識碼:AOriginof3MembersaltrockofShahejieFormationinDongpuSagSUHui,XUHua—zheng,ZHANGJin—chuan,QULi—ping!。WANGPing—xia!,ZENGTan,LIGui—xia!,QIA()Zhaoze(1.ChinaUniversityoJ’Geosciences,Beijing100083,China;2.ResearthInstituteo,’ExplorationandDevelopment,ZhongyuanOilfield,Sin
4、opec,Henan457001,China;3.SinopecExploration&Produ~’tionResearchInstitute,BeOing100083.China)Abstract:InDongpuSag,redsedimentscanbefoundwithinthesalt—gypsumdevelopedin3MemberofShahejieFormation(Es3).Shallowwaterandexposedsignsarealsofoundasscoursurfaces,mudcracksandrip
5、plemarksinthecores.Lakeshoreon—offsignsoflowstandwedge,truncationanddownlaparerecognizedfromseismicprofiles.TheseindicatethatthewaterdepthofpaleolakechangedduringthedepositionofEs3.Deep—greyanddarkmudstonesandafewgravitysandbodiesdevelopedinthehighstandperiod,whilesal
6、trock,gypsumrock,lowstanddeltasandfandeltasdevelopedinthelowstandperiod.Asaresult,deeplakemudstonesareinterbeddedwithevaporitesandlowstandsandbodies.Thepaperarguesthatthesaltrocksaredepositedinshallowwater,thesaltcomesfromtheIower—MiddleOrdovicianseriesofthesurroundin
7、guplifts.Thisargumentisdifferentfromthepasttheoriesof’highmountaindeeplake”.’’saltdepositedindeepwater”and”saltdepositedinmarinefacies”.Keywords:DongpuSag;saltdepositedinshallowwater;saltdepositedindeepwater;theoryoftransgression;theoryofcontinentals0I】roe對東濮凹陷沙河街組三段(
8、Es。)的鹽巖成因過去中央凸起帶厚1500~2500m,凹陷深處厚達(dá)3500m。曾有多種解釋,主要觀點(diǎn)有:深水成因(鹽源為深部鹵Es。是東濮凹陷的主要生儲油氣層系,其中包括3種沉水)_】],高山深盆成因(鹽源為陸源、深部鹵水、侵入海積類型:鹽膏沉積