川西地区晚侏罗世蓬莱镇期构造隆升的沉积响应陈洪德1,2,徐胜林21.“油气藏地质及开发工程”国家重点实验室,成都610059;2.成都理工大学沉积地质研究院,成都610059[摘要]以川西地区晚侏罗世蓬莱镇期地层为研究对象,通过对川西北部地区、中部地区南部地区三级层序充填特征的研究,分析了龙门山造山带与川西地区的盆山耦合关系。川西地区蓬莱镇组层序关键界面主要有3种表现形式:最大湖泛面、区域性侵蚀间断面或侵蚀不整合面、区域性平行不整合面。以此为基础,将蓬莱镇组划分为5个三级层序(SQ1~SQ5);同时,通过对SQ3层序在川西地区沉积充填特征的研究,认为进积期(PST)龙门山构造带构造推覆作用不发育,山前地区和盆地边缘地区转变为沉积物剥蚀区,盆地内发育三角洲-湖泊沉积环境;退积期(RST)龙门山造山带构造推覆作用增强,山前地区和盆地边缘地区受此作用相对下沉,接受沉积,此时冲积扇-湖泊沉积环境发育,三角洲沉积环境不发育。[关键词]层序;层序充填;盆山耦合;蓬莱镇组;川西DepositionalresponsetothetectonicupliftduringtheLateJurassicPenglaizhenStageinWestSichuan,ChinaCHENHong-de1,2,XUSheng-lin21.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,Chengdu610059,China;2.InstituteofSedimentaryGeology,ChengduUniversityofTechnology,Chengdu610059,ChinaAbstract:InordertoknowthecouplingrelationshipbetweentheLongmenshanorogenandtheareasofWestSichuan,thispaperstudiesthesequence-sedimentaryfillingcharacteristicsofUpperJurassicPenglaizhengFormationintheareasofWestSichuanbyusingsequencestratigraphy.Itfindsthatthetypesofthesequenceboundaryaremanlythemaximumfloodingsurface(mfs),theregionalerosionalunconformitysurface,andtheparallelunconformitysurfaceandthatfivethird-ordersedimentarysequencearedivided(SQ1~SQ5).Accordingtotheresearch,thesedimentaryfillingcharacteristicsofSQ3,thePSTsystemtractoccurredduringthestagewhenthetectonicmovementwasquiet,thesedimentsmainlycameformthefrontierofthemountainandthewedgeoftheareasinWestSichuan,thedeltafansedimentarysystemwasthemainsettinginthebasin,andthealluvialfansedimentarysystemwashardlyfound.TheRSTsystemtractoccurredduringthestagewhenthetectonicmovementhappened.Atthistime,thesedimentationtookplaceonthefrontierofthemountainandthewedgeoftheareasinWestSichuan,thealluvialfansedimentarysystemwasthemainsetting,andthedeltafansedimentarysystemhardlydeveloped.Keywords:third-ordersequence;sedimentaryfillingcharacteristics;coupling;PenglaizhengFormation;WestSichuan---本文来源于网络,仅供参考,勿照抄,如有侵权请联系删除---鄂尔多斯盆地白豹-华池地区长6-3厚层块状砂岩成因田景春,隆昊,苏楠,王卫红,张锦泉“油气藏地质及开发工程”国家重点实验室(成都理工大学),成都610059[摘要]鄂尔多斯盆地中部的白豹-华池地区延长组长6油层组的长6-3亚段以发育厚层块状砂岩为特征,对其成因的认识分歧很大。作者在众多前人研究成果的基础上,充分利用区内钻井岩心、测井及地震资料对长6-3厚层砂岩特征进行研究,认为它是由正常沉积与事件沉积所形成的砂体相互叠加而构成的。其中正常沉积为三角洲前缘砂体,事件沉积为地震作用所形成的砂体以及由地震作用导致三角洲前缘滑塌再搬运而形成的浊积砂体。2种作用、3种成因类型砂体在垂向上相互叠置、在平面上相互交叉,构成了该地区广泛分布的厚层砂岩。[关键词]鄂尔多斯盆地;延长组;厚层块状砂岩;成因GenesisofChang6-3sandstoneofUpperTriassicYanchangFormationinBaibao-HuachiareaofOrdosBasin,ChinaTIAN激ng-chun,LONGHao,SUNan,WANGWei-hong,ZHANG激n-quanStateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,Chengdu610059,ChinaAbstract:TheChang6oillayerislocatedintheBaibao...