中伊朗盆地卡尚地区库姆组层序地层研究
|
摘要
利用野外露头、钻井和地震资料,通过岩相、沉积旋回以及地震层序和地震相分析建立中伊朗盆地库姆组的层序地层系统、框架模式及沉积体系,岩性地层单元与沉积层序的对应关系。研究发现库姆组沉积于一个受全球海平面升降变化及区域构造活动影响而与波斯湾间歇性相通的弧后大陆边缘海盆地,是一顶底面以不整合界面为界的构造层序(超层序组),其内部发育3个3级层序。依据库姆组沉积时的盆地形态和沉积环境分析将盆地分为岛弧、台地、斜坡、盆地4个次级构造-沉积单元。盆地南缘为障壁岛,由于陆源碎屑少,南带及中带沉积碳酸盐岩为主;而北东缘为陆地,陆源(火山)碎屑供应充分,发育扇、河控三角洲沉积体系;东南岛弧带则沉积碳酸盐岩夹火山碎屑岩为主。
Qum Formation was deposited in a back-arc continental marginal basin which was intermittently connected with Persian Gulf sea due to the eustatic variations and tectonic activities and both the top and bottom surfaces were bounded by unconformities.It was recognized as a supersequence with 3 third-order sequences.A model of sequence stratigraphic framework and the relationship between lithological subunits and depositional sequences were established through integrated analysis of lithofacies, depositional sequence, as well as seismic stratigraphy based on evidences of outcrops, wells and seismic data.Based on the configuration of the basement the basin can be approximately subdivided into 3 tectonic-depositional units:platform, slope and basin.The dominant sediments from the southern platform to the basin center was limestone due to the insufficient clastics supply from the southern island-arc.Sands and conglomerate in fan-delta depositional system were common in the northern platform due to the abundant clastic supply from the northeastern continental terrenes.Carbonate with some volcaniclastic rocks were developed in southern island-arc.
Qum Formation was deposited in a back-arc continental marginal basin which was intermittently connected with Persian Gulf sea due to the eustatic variations and tectonic activities and both the top and bottom surfaces were bounded by unconformities.It was recognized as a supersequence with 3 third-order sequences.A model of sequence stratigraphic framework and the relationship between lithological subunits and depositional sequences were established through integrated analysis of lithofacies, depositional sequence, as well as seismic stratigraphy based on evidences of outcrops, wells and seismic data.Based on the configuration of the basement the basin can be approximately subdivided into 3 tectonic-depositional units:platform, slope and basin.The dominant sediments from the southern platform to the basin center was limestone due to the insufficient clastics supply from the southern island-arc.Sands and conglomerate in fan-delta depositional system were common in the northern platform due to the abundant clastic supply from the northeastern continental terrenes.Carbonate with some volcaniclastic rocks were developed in southern island-arc.
引文
[1] FurrerM,SoderP.TheOligo-MioceneMarineFormationoftheQumRegion,CentralIran[A].Proc.4thWorldPetroleumCongr[C].I=A=5,1,Rome,1955.
[2] SoderPA.DetailedinvestigationsonthemarineformationofQum[M].2ndReport.N.I.O.C.Gr.1959,185,58.
[3] Bozorgnia,F.QumFormationstratigraphyoftheCentralBasinofIrananditsinter-continentalposition[J].Bull.IranPet.Inst,1996,24:69-76.
[4] RasoolOkhravi,AbdolhosseinAmini.Anexampleofmixedcarbonate-pyroclasticsedimentation(Miocene,CentralBasin,Iran)[J].SedimentaryGeology,118(1998)37-54.
[5] VailPR,MitchumJr,RM,ThompsonS.SeismicStratigraphyandglobalchangesofsealevel[A].In:Payton,C.A.(Ed.),SeismicStratigraphy-ApplicationtoHydrocarbonExploration[C].AAPG.Mem.1977,26:165-184.
[6] ChritianRavenne,2002.Sequencestratigraphyevolutionsince1970[A].in:Historyofscience[C].C.R.Palevol1(2002)415-438.
[7] SargJF.Thesequencestratigraphy,sedimentology,andeconomicimportanceofevaporitecarbonatetransitions:areview[J].Sedimenta-rygeology,2001,140:9-42
[8] 列兹尼科夫AΠ.沉积岩石学讲稿[M].北京:科学出版社,1959.
[2] SoderPA.DetailedinvestigationsonthemarineformationofQum[M].2ndReport.N.I.O.C.Gr.1959,185,58.
[3] Bozorgnia,F.QumFormationstratigraphyoftheCentralBasinofIrananditsinter-continentalposition[J].Bull.IranPet.Inst,1996,24:69-76.
[4] RasoolOkhravi,AbdolhosseinAmini.Anexampleofmixedcarbonate-pyroclasticsedimentation(Miocene,CentralBasin,Iran)[J].SedimentaryGeology,118(1998)37-54.
[5] VailPR,MitchumJr,RM,ThompsonS.SeismicStratigraphyandglobalchangesofsealevel[A].In:Payton,C.A.(Ed.),SeismicStratigraphy-ApplicationtoHydrocarbonExploration[C].AAPG.Mem.1977,26:165-184.
[6] ChritianRavenne,2002.Sequencestratigraphyevolutionsince1970[A].in:Historyofscience[C].C.R.Palevol1(2002)415-438.
[7] SargJF.Thesequencestratigraphy,sedimentology,andeconomicimportanceofevaporitecarbonatetransitions:areview[J].Sedimenta-rygeology,2001,140:9-42
[8] 列兹尼科夫AΠ.沉积岩石学讲稿[M].北京:科学出版社,1959.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心