地球学报2025，Vol.46Issue(3)：637-648,12.DOI:10.3975/cagsb.2025.021021
羌塘盆地中侏罗统布曲组岩相古地理特征及其油气地质意义
Lithofacies Paleogeographic Characteristics of Middle Jurassic Buqu Formation in the Qiangtang Basin of Xizang and Its Oil-gas Geological Significance
摘要
Abstract
The Middle Jurassic Buqu Formation in the Qiangtang area of Xizang is an important oil and gas reservoir.Owing to the limitations of basic geological data,the distribution of lithofacies paleogeography in the Jurassic Buqu Formation in the Qiangtang area is controversial,and precise characterization of lithofacies paleogeographic evolution is lacking.A stratigraphic framework including geological field profile investigations,drilling core observations,and the study of various sedimentary markers in the periphery of the Qiangtang area was used to explore the stratigraphic characteristics and lithofacies paleogeographic evolution at different periods of the Jurassic Buqu Formation.The results showed that in the Middle Jurassic,the Qiangtang Basin inherited the evolutionary history of cracking and stretching from the Early Jurassic.Under the influence of ocean basin stretching,the Qiangtang Basin developed into a passive continental margin basin,and its upper facies paleogeographic units developed confined and open platforms.The facies belt spreads in a north-south direction and gradually deepens from north to south.The main development was confined to the platform-open platform-shelf sediments.Dolomite exists in a limited platform evaporation environment in the first member of the Buqu Formation in North Qiangtang,which is a high-quality reservoir and is the main future exploration target.关键词
羌塘盆地/侏罗纪/布曲组/岩相古地理Key words
Qiangtang Basin/Jurassic/Buqu Formation/lithofacies paleogeography分类
天文与地球科学引用本文复制引用
侯乾,占王忠,牟传龙,万友利,曾胜强,孙伟,谢尚克,曾俊杰..羌塘盆地中侏罗统布曲组岩相古地理特征及其油气地质意义[J].地球学报,2025,46(3):637-648,12.基金项目
本文由中国地质调查局地质调查项目(编号:DD20230266)、四川省自然科学基金项目(编号:2024NSFSC0833)、国家自然科学基金项目(编号:42172134)和中石化股份有限公司科技项目(编号:P21086-6)联合资助. This study was supported by China Geological Survey(No.DD20230266),Natural Science Founda-tion of Sichuan Province(No.2024NSFSC0833),Na-tional Natural Science Foundation of China(No.42172134),and Technology Project of Sinopec Co.,LTD(No.P21086-6). （编号:DD20230266）
