摘要
四川盆地蜀南地区灯影组沉积体系长期存在争议。通过系统收集蜀南地区及其周缘地区大量的野外露头、岩芯观察、钻测井资料,运用岩石学、沉积学以及构造地质等多种方法,针对蜀南地区的沉积相、沉积微相以及碳酸盐台地沉积体系的特征展开了全面分析,综合沉积相的平面及纵向展布,结合古地貌的约束条件,总结出蜀南地区灯影组的沉积模式。研究发现灯影组岩石以藻云岩(含藻纹层、葡萄花边状、高能藻丘)、晶粒云岩(泥晶、粉晶)、颗粒云岩为主,沉积环境属碳酸盐岩台地体系,含局限台地、台地边缘亚相,可细分台内滩、台缘滩、灰泥丘、藻丘4个微相;沉积微相整体表现为台缘滩、台内滩及藻丘在古地貌高部位广泛发布且连续性好,台内低部位台坪微相发育;灯影组沉积受构造—海平面协同控制:桐湾运动控裂陷槽演化,早期(灯一—二段)海侵期发育台缘—台内丘滩;中期(灯三段)混积陆棚;晚期(灯四段)裂陷槽周缘形成台缘滩及藻丘,暴露岩溶改造形成“裂陷槽控相、丘滩—岩溶叠合储层”模式。系统地构建了蜀南地区灯影组的沉积模式,为四川盆地碳酸盐岩的勘探和开发提供重要的理论意义和实际指导意义。
For a long time,the sedimentary system of the Dengying Formation in the southern Sichuan region of Sichuan Basin has been a topic that elicits much debate.By systematically collecting a large amount of field outcrop,rock core observation,drilling and logging data from the southern Sichuan region and its surrounding areas,and using various methods such as petrology,sedimentology,and struc-tural geology,a comprehensive analysis was conducted on the characteristics of sedimentary facies,sedimentary microfacies,and carbon-ate platform sedimentary systems in the southern Sichuan region.Based on the plane and vertical distribution of sedimentary facies and the constraints of ancient landforms,the sedimentary model of the Dengying Formation in the southern Sichuan region was summarized.Research shows that the rocks of the Dengying Formation are mainly composed of algal dolomite(including algal layers,grape lace like structures,and high-energy algal mounds),grain dolomite(mud crystals,powder crystals),and granular dolomite.The sedimentary en-vironment belongs to the carbonate platform system,which includes limited platform and platform edge subfacies.It can be subdivided into four microfacies:intra platform beach,platform edge beach,mud mud mound,and algal mound.The overall sedimentary microfacies show that platform margin shoals,intra-platform shoals and algal mounds are widely distributed and continuous in the high parts of the paleotopography,while the platform microfacies develop in the low parts of the intra-platform.The sedimentation of the Dengying Forma-tion is controlled by the synergy of tectonics and sea level:the Tongwan Movement controls the evolution of the rift basin,during the ear-ly stage(DengyingⅠ—Ⅱ),the transgression period developed platform margin and intra—platform mounds;during the middle stage(DengyingⅢ),mixed sedimentary shelves;during the late stage(DengyingⅣ),platform margin shoals and algal mounds formed a-round the rift basin,and exposed karst modification formed the"rift basin controlled facies,mound—shoal—karst superimposed reser-voir"model.The sedimentary model of the Dengying Formation in the southern Sichuan region was systematically constructed,which has important theoretical significance and practical guiding significance for the exploration and development of carbonate rocks in Sichuan Basin.
作者
杨翰轩
郑马嘉
隆辉
李悦悦
陈君青
李卓远
庞宏
刘田
卢嘉勋
Yang Hanxuan;Zheng Majia;Long Hui;Li Yueyue;Chen Junqing;Li Zhuoyuan;Pang Hong;Liu Tian;Lu Jiaxun(South Sichuan Gas Field,PetroChina Southwest Oil&Gasfield Company,Luzhou 646000,China;State Key Laboratory of Oil and Gas Resources and Exploration,Beijing 102249,China;College of Geoscience,China University of Petroleum(Beijing),Beijing 102249,China;College of Science,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《能源与环保》
2025年第8期104-115,共12页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
中国石油西南油气田分公司蜀南气矿2023年重大科技专项项目(2023ZX01-01)。
关键词
蜀南地区
沉积相识别
沉积特征
沉积模式
southern Sichuan region
sedimentary facies identification
sedimentary characteristics
sedimentary model
