川西—川中地区上三叠统地层对比及沉积充填特征  

Stratigraphic Correlation of the Upper Triassic and Its Sedimentary Filling Characteristics in the Western and Central Sichuan Basin

作　　者：王小娟[1] 王昌勇[2] 陈小二 刘帅 范亚楠 林如南 WANG XiaoJuan;WANG ChangYong;CHEN XiaoEr;LIU Shuai;FAN YaNan;LIN RuNan(Research Institute of Exploration and Development,PetroChina Southwest Oil&Gas Field Company,Chengdu 610051,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;Geophysical Technology Research Centre,BGP,CNPC,Chengdu 610213,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,成都610051 [2]成都理工大学沉积地质研究院,成都610059 [3]东方地球物理公司物探技术研究中心,成都610213

出　　处：《沉积学报》2023年第2期435-449,共15页Acta Sedimentologica Sinica

基　　金：中石油西南油气田分公司科技项目(20180301-12)。

摘　　要：根据野外露头、岩心、测井及地震解释成果,结合岩石薄片等分析测试成果,对四川盆地西部—中部地区上三叠统内部层段进行了厘定,并对物源体系及沉积充填特征进行了研究。早卡尼期川西坳陷最早接受沉积,马鞍塘组自西向东、向北上超于雷口坡组古喀斯特面之上,晚卡尼期发生强烈海退导致沉积范围缩小,该期以发育障壁海岸—陆棚沉积体系为主。早诺利期伴随再次海侵,小塘子组再次向川中隆起上超,晚诺利期构造活动导致龙门山中、北段大幅隆升和剥蚀,沉积环境从障壁海岸—陆棚沉积体系向河流相—三角洲沉积体系演变。早瑞替期河流—三角洲沉积体系广泛发育,地层继续向隆起带上超,在中瑞替期川中隆起带开始接受沉积。安县运动导致龙门山大幅抬升和须家河组早期沉积的大量剥蚀,以发育冲积扇—扇三角洲及三角洲为特征。印支晚期差异构造抬升导致须家河组上部地层的削截,自南东—北西须家河组顶部的削蚀量逐渐增大。川西—川中地区上三叠统主要受西部及东南部物源体系控制,早期沉积充填特征主要受雷口坡组古喀斯特地貌控制,而晚期沉积充填特征主要受印支晚期构造活动控制,龙门山的持续抬升导致湖盆中心及物源交汇区不断向东迁移。Based on outcrops,core logging,seismic interpretation,rock thin section analysis,and other analysis re⁃sults,the internal layer of the Upper Triassic in the western and central Sichuan Basin was recorrelated.The prove⁃nance system and sedimentary filling characteristics of the Upper Triassic in the study area were studied in this paper.The Western Sichuan Depression was the first to receive sediments in the Early Carnian,and the Ma’antang Forma⁃tion overlays the paleokarst surface of the Leikoupo Formation from west to east and south to north.Strong regressions occurred during the Late Carnian,which resulted in the reduction of the sedimentary range,and the Western Sichuan Depression was dominated by the development of a barrier coastal and shelf sedimentary system.Accompanied by retransgression in the Early Norian period,the Xiaotangzi Formation uplifted to the central Sichuan Basin again.The tectonic activities in the Late Norian led to significant uplift and denudation in the central and northern sections of the Longmen Mountains,and the sedimentary environment evolved from barrier coastal shelf to fluvial and marine delta.The fluvial and delta sedimentary system developed extensively during the Early Rhaetian,the strata continued to overlap towards the central Sichuan uplift,and the uplift zone began to accept sediments during the Middle Rhaetian.The Anxian Movement resulted in the substantial uplift of the Longmen Mountains and vast denudation of the early de⁃posits of the Xujiahe Formation.The sedimentary facies were characterized by alluvial fan,fan delta,and delta dur⁃ing the Late Rhaetian stage.The differential tectonic uplift in the Late Indosinian resulted in the truncation of the up⁃per strata of the Xujiahe Formation,and the erosion of the top of the Xujiahe Formation increased gradually from the southeast to the northwest.The Upper Triassic in the western and central Sichuan Basin is mainly controlled by the western and southeastern provenance systems.The early sedimentary filling char

关 键 词：物源体系 构造活动 安县运动 马鞍塘组 须家河组 

分 类 号：P512.2[天文地球—地质学]