东北石油大学学报2025，Vol.49Issue(2)：19-29,11.DOI:10.3969/j.issn.2095-4107.2025.02.002
川中古隆起北斜坡下寒武统沧浪铺组一段混合沉积特征及模式
Mixed sedimentary characteristics and sedimentary models of the first member of Lower Cambrian Canglan-gpu Formation in the northern slope area of the Central Sichuan Paleo-uplift
摘要
Abstract
In the north slope of the Central Sichuan Paleo-uplift,the Lower Cambrian Canglangpu For-mation exhibits mixed sedimentation,with complex exploration conditions.Based on the observation of typical well core and thin section of the Lower Cambrian Canglangpu Formation in the north slope of the Central Sichuan Paleo-uplift,the rock geological characteristics,sedimentary environment,and diagene-sis of the first member of Canglangpu Formation are analyzed,and the characteristics and types of mixed sedimentation are discussed.Combining well logging data and core analysis,the spatial distribution of mixed sediments is depicted,and the controlling factors and sedimentation patterns of mixed sediments in the study area are revealed.The results show that on a microscopic level,the first member of Cang-langpu Formation mixed sedimentation is characterized by frequent alternating or interweaving of terrig-enous clastic components and carbonate rock components,resulting in mixed sedimentary rocks with mixed sedimentation characteristics.On a macroscopic level,the mixed sedimentation in the first mem-ber of Canglangpu Formation is characterized by a variety of complex mixed sedimentary sequences,such as mixed sedimentary rock sequences,clastic rock-mixed sedimentary rock sequences,clastic rock-carbonate rock sequences,and carbonate rock-mixed sedimentary rock sequences.Different mixed sedi-mentary sequences form composite type Ⅰ mixed sedimentary structures,composite type Ⅱ mixed sedi-mentary structures,and gradual type mixed sedimentary structures,etc.The mixed sediments of the first member of Canglangpu Formation are mainly affected by sea level fluctuation,tectonic movement and storm action,and are also influenced by the terrigenous debris captured by microorganisms and palaeo-cup organisms.Compared with the Longwangmiao Formation mixed sedimentation,the propor-tions of terrigenous quartz grain volume,size,and mixed sedimentation intensity in the first member of Canglangpu Formation are greater than that in the Longwangmiao Formation,and the types of mixed sedimentation are more diverse,the mixed sedimentary sequences are more complex,and favorable res-ervoirs develop in weakly mixed sedimentary gravel bars or gravel.The results provide a basis for the next step of oil and gas exploration and development in the Canglangpu Formation of the Sichuan Basin.关键词
混积岩/混积层系/混合沉积类型/沉积特征/沉积模式/沧浪铺组/寒武统/川中古隆起Key words
mixed sedimentary rock/mixed sedimentary sequences/mixed sedimentary type/sedimentary characteristics/sedimentary models/Canglangpu Formation/Cambrian/Central Sichuan Paleo-uplift分类
石油、天然气工程引用本文复制引用
龙虹宇,杨西燕,范存辉,张亚,和源,周刚,李勇,李成龙,陈迪,陈曦,钟梓月..川中古隆起北斜坡下寒武统沧浪铺组一段混合沉积特征及模式[J].东北石油大学学报,2025,49(2):19-29,11.基金项目
国家自然科学基金项目(U2344209) （U2344209）
中国石油天然气股份有限公司科研项目(2023ZZ16YJ01) （2023ZZ16YJ01）
