| 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 |
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| 关键词:Qiangtang Basin Jurassic Buqu Formation lithofacies paleogeography |
| 基金项目: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) |
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| Lithofacies Paleogeographic Characteristics of Middle Jurassic Buqu Formation in the Qiangtang Basin of Xizang and Its Oil-gas Geological Significance |
| 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 Ju-rassic Buqu Formation in the Qiangtang area is controversial, and precise characterization of lithofacies paleogeographic evolution is lacking. A stratigraphic framework including geological field profile inves-tigations, 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 evolu-tion 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. Un-der the influence of ocean basin stretching, the Qiangtang Basin developed into a passive continental mar-gin 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. |
| HOU Qian,ZHAN Wangzhong,MOU Chuanlong,WAN Youli,ZENG Shengqiang,SUN Wei,XIE Shangke,ZENG Junjie.2025.Lithofacies Paleogeographic Characteristics of Middle Jurassic Buqu Formation in the Qiangtang Basin of Xizang and Its Oil-gas Geological Significance[J].Acta Geoscientica Sinica,46(3):637-648. |
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