海相油气地质2024，Vol.29Issue(1)：17-29,13.DOI:10.3969/j.issn.1672-9854.2024.01.002
论羌塘含油气盆地关键地层划分对比问题
Advances in division and correlation of stratigraphy in the oil-bearing Qiangtang Basin,North Tibet
摘要
Abstract
Due to lower exploration degree,the stratal pattern and correlation is still controversial in the oil-bearing Qiangtang Basin,one of the largest sedimentary archives with thick organic carbon-rich strata in the Tibetan Plateau,which impacting the basin evaluation of petroleum conditions and oil-bearing systems.Based on investigations of biostratigraphy,chronostratigraphy,sequence stratigraphy and basin evolution of the Qiangtang Basin,we conduct a comprehensive data compilation to analyze the depositional history and ages of the basin rock record.The results reveal that:(1)New isotopic chronology data confirm that there is a Precambrian metamorphic crystalline basement in the Qiangtang Basin.The Paleozoic basement fold system is buried at a depth of 7-15 km,which is overlaid unconformably by the Mesozoic deposits.(2)The proposed age of the Nadikangri Formation is the Upper Triassic,contradicting previous suggestion of Lower-Middle Jurassic.(3)The dolomites of the paleo-reservoir in the southern Qiangtang Basin belong to the Late Triassic rather than the Middle Jurassic in age,and the dolomites are probably"allochthonous root-less"and tectonic contact with the Buqu Formation.(4)The Bilong Co oil shales in the southern Qiangtang Basin belong to the Lower Jurassic rather than the Middle Jurassic.(5)The Quemo Co Formation has an age not younger than the Middle to Lower Jurassic rather than the original suggestion of the Middle Jurassic.(6)Facies changes and paleontological analysis combined with isotopic data indicate that the Shenglihe-Changsheshan oil shale was deposited in a marine environment during the Early Cretaceous.(7)Isotopic chronology and field geological survey confirm that the Kangtuo and Suonahu Formations comprise simultaneous strata with different sedimentary facies.The data synthesis and progress in stratigraphic research of the Qiangtang Basin provide a new basis for the development of the stratigraphic division and correlation scheme of the basin,as well as the analysis of its petroleum system and potential.关键词
地层对比/年代地层/生物地层/中—新生界/羌塘盆地Key words
stratigraphic division and correlation/chronostratigraphy/biostratigraphy/Mesozoic-Cenozoic/Qiangtang Basin分类
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王剑,张豪薇,张健,沈利军,张建勇,付修根..论羌塘含油气盆地关键地层划分对比问题[J].海相油气地质,2024,29(1):17-29,13.基金项目
本文受国家自然科学基金项目"羌塘盆地侏罗纪成盐环境与盐构造演化及其油气赋存效应"(编号:42241202)和中国石油"十四五"前瞻性基础性课题"羌塘盆地构造沉积演化与基本石油地质条件研究"(编号:2021DJ0801)联合资助 （编号:42241202）
