摘要
综合利用野外露头、岩心、钻测井等资料,对四川盆地及周缘地区晚奥陶世岩相古地理演化过程进行了描述和对比,并探讨了其主控因素。研究结果表明:①加里东运动早期拉张—伸展作用导致四川盆地周缘坳陷加深,其后扬子板块和华夏地块碰撞挤压,形成了晚奥陶世以上扬子地区为中心,西北、西部、南部三面环隆的古地理格局。②四川盆地及周缘地区晚奥陶世可划分出(混积)滨岸、碳酸盐缓坡、(混积)陆棚相等沉积相类型。宝塔组—临湘组主要发育碳酸盐缓坡相;五峰组沉积期海侵达到高峰,碳酸盐缓坡被淹没,发育(混积)陆棚相深水黑色页岩;观音桥组沉积期发生的海退导致大部分地区由深水陆棚转为浅海陆棚亚相;各时期古隆起周缘均有(混积)滨岸相发育,受物源影响部分地区具有混合沉积特征。③研究区晚奥陶世岩相古地理格局受构造运动、海平面变化和古气候等因素综合控制,在沉积相平面展布和垂向演化上均有体现。
Based on outcrops,cores,drilling and logging data,the evolution process of Lithofacies paleogeogra‐phy of Late Ordovician in Sichuan Basin and its surrounding areas was described and compared,and the main controlling factors were discussed.The results show that:(1)The early Caledonian tension-extension led to the deepening of the depression around the study area,and then the collision and extrusion of the Yangtze plate and Cathaysia block formed the paleogeographic pattern of the upper Late Ordovician Yangtze region as the center,surrounded by uplifts on the northwest,west and south sides.(2)The Late Ordovician in Sichuan Basin and its surrounding areas can be divided into(mixed)shore,carbonate gentle slope and(mixed)shelf sedimentary facies.The Baota Formation-Linxiang Formation mainly developed carbonate gentle slope facies.At the transgressive peak of Wufeng Formation,the carbonate gentle slope was submerged and developed(mixed)shelf deep water black shale.The regressions of Guanyinqiao Formation led to the transition from deep shelf to shallow shelf sub‐facies in most areas.There are(mixed)shore facies developed in the periphery of paleo-uplift in all periods,and some areas affected by provenance have mixed sedimentary characteristics.(3)The lithofacies paleogeographic pattern of the Late Ordovician in the study area is controlled by multiple factors such as tectonic movement,sea level change and paleoclimate,which is reflected in the plane distribution and vertical evolution of sedimentary facies.
作者
孙汉骁
邢凤存
谢武仁
钱红杉
SUN Hanxiao;XING Fengcun;XIE Wuren;QIAN Hongshan(Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;Research Institute of Exploration and Development,PetroChina Southwest Oil and Gas Field Company,Chengdu 610041,China)
出处
《岩性油气藏》
CAS
CSCD
北大核心
2024年第1期121-135,共15页
Lithologic Reservoirs
基金
国家自然科学基金“川东北早三叠世飞仙关期同期多排碳酸盐台缘带不对称沉积结构及成因”(编号:41302089)和“川北江油-剑阁地区早三叠世近源重力流滑塌砾石早期白云石化记录及其地质意义”(编号:41672103)联合资助
关键词
(混积)滨岸
碳酸盐缓坡
(混积)陆棚
岩相古地理
沉积演化
宝塔组—临湘组
五峰组
观音桥组
晚奥陶世
四川盆地
(mixed)shore
carbonate gentle slope
(mixed)shelf
lithofacies paleogeography
sedimentary evolution
Baota Formation-Linxiang Formation
Wufeng Formation
Guanyinqiao Formation
Late Ordovician
Sichuan Basin
