【摘要】 为明确松辽盆地北部古龙地区登娄库组沉积与构造演化的耦合关系,本文利用古龙地区的地震、钻井、测井和岩心等资料,通过古龙地区登娄库组的构造演化特征、层序地层格架和沉积特征综合研究,对古龙地区登娄库组构造演化对沉积充填特征的控制作用进行分析,结果表明,古龙地区登娄库组沉积时期为断坳转换期,可进一步划分为断陷盆地萎缩阶段早期和晚期、坳陷盆地孕育阶段早期和晚期4个构造演化阶段,分别对应4个三级层序(Sq1-Sq4);古龙地区登娄库组主要发育冲积扇、扇三角洲、湖底扇、河流相、辫状河三角洲、浅水三角洲、湖泊沉积等沉积体系;登娄库组构造演化控制着沉积充填演化,各构造演化阶段沉积体系分布特征及沉积演化模式具有明显的差异性,即沉积充填特征与构造演化过程具有良好的耦合关系。具体表现为:断陷盆地萎缩阶段早期(Sq1)和晚期(Sq2)下部地层受断陷作用控制,沉积充填特征符合陆相断陷湖盆沉积演化模式;断陷盆地萎缩阶段晚期(Sq2)上部、坳陷盆地孕育阶段早期(Sq3)和晚期(Sq4)地层具有坳陷层序地层特征,其中萎缩阶段晚期(Sq2)上部和坳陷盆地孕育阶段早期(Sq3)属于坳陷盆地"河流—浅水三角洲"沉积模式;坳陷盆地孕育阶段晚期(Sq4)发育干旱背景下的坳陷湖盆"洪水—河漫湖"沉积模式。更多还原

【Abstract】 In order to clear the coupling relationship between sedimentary and tectonic evolution in the Denglouku Formation in Gulong area of northern Songliao Basin,we use seismic,drilling, logging and core data of Gulong area,by comprehensive study of tectonic evolution characteristics,sequence stratigraphic framework and sedimentary characteristics to analysis the control function of tectonic evolution to sedimentary filling characteristics in Denglouku Formation of Gulong area,the results show that in Denglouku Formation of Gulong area the depositional period is fault-depressed diversionary,also can be further divided into four tectonic evolution stage,which is early and late shrinking stage in fault basin,early and late embryonic stage in depression basin,corresponding to the four third-order sequence(Sq1-Sq4); Denglouku Formation of Gulong area main development alluvial fan,fan delta,sublacustrine fan,fluvial facies,braided river delta,shallow water delta and lake sediments depositional systems;Tectonic evolution controls the sedimentary filling evolution in Denglouku Formation, the sedimentary system distribution characteristics and sedimentary evolution model has significant difference in each tectonic evolution stage,that is,sedimentary filling characteristic and tectonic evolution process has good coupling relationship.The concrete embody:in early (Sql)and late(Sq2 ) shrinking stage,lower strata of fault basin was controlled by fault,the sedimentary filling characteristics accord with the sedimentary evolution mode of terrestrial riftsubsidence lacustrine basin;The upper of fault basin in the late(Sq2) shrinking stage,and the formation of depression basin in early(Sq3 ) and late(Sq4 ) embryonic stage has depression sequence stratigraphic features,which the upper of fault basin in the late(Sq2 ) shrinking stage and early(Sq3 ) embryonic stage in depression basin belongs to "rivers-shallow water delta" depositional model of depression basin;The late(Sq4 ) embryonic stage in depression basin development " flood-overlake" depositional model in depression lake basin under the arid background.更多还原