特种油气藏2026，Vol.33Issue(1)：11-21,11.DOI:10.3969/j.issn.1006-6535.2026.01.002
柴达木盆地大风山构造带新近系下油砂山组湖相混积岩特征及其成岩作用分析
Characteristics and diagenesis of lacustrine mixed sedimentary rocks of the Neogene Lower Youshashan Formation in Dafengshan structural belt,Qaidam Basin
摘要
Abstract
To clarify the lithological classification,diagenetic types,and genetic mechanism of the tight mixed sedimentary rocks of the Neogene Lower Youshashan Formation in Fengxi Area of the Dafengshan structural belt,northwestern Qaidam Basin,an integrated analysis was made using core observation,thin-section identification,X-ray diffraction,and other techniques.A new classification scheme for fine-grained mixed sedimentary rocks was proposed,which specified the rock types of the Lower Youshashan Formation mixed rocks in Fengxi Area and further guided the division of mixed-rock faci-es and analysis of the main development controlling factors.The results show that algal dolomite and micritic dolomite are the most favorable rock types in the study area,followed by algal limestone and micritic limestone.Diagenetic processes include dolomitization,dissolution,authigenic mineral filling,and fracturing.Based on the diagenetic analysis,the Lower Youshashan Formation reservoir is subdivided into five diagenetic facies.The genesis of the lacustrine mixed sedimentary rock reservoir in the Dafengshan area is controlled by multiple factors;with increasing burial depth,various diagenetic processes lead to further reservoir densification,but constructive diagenesis still enables the formation of high-quality res-ervoirs.This study provides valuable guidance for the identification of mixed sedimentary rocks and for research on favora-ble"sweet-spot"diagenetic facies in the Dafengshan structural belt of northwestern Qaidam Basin.关键词
混积岩/成岩作用/大风山构造带/风西地区/下油砂山组/柴达木盆地Key words
mixed sedimentary rocks/diagenesis/Dafengshan structural belt/Fengxi Area/Lower Youshashan For-mation/Qaidam Basin分类
能源科技引用本文复制引用
何辉,谢琳,李显明,何建红,李仕远,侯鸣秋,马朋善..柴达木盆地大风山构造带新近系下油砂山组湖相混积岩特征及其成岩作用分析[J].特种油气藏,2026,33(1):11-21,11.基金项目
中国石油科技重大专项"深层/超深层油气藏开发技术研究"(2021DJ1001) （2021DJ1001）
