| 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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| 引用本文：侯乾,占王忠,牟传龙,万友利,曾胜强,孙伟,谢尚克,曾俊杰.2025.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,46(3):637-648. |
| DOI：10.3975/cagsb.2025.021021 |
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| 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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| 中文摘要:羌塘盆地中侏罗统布曲组是重要的油气储层。受限于基础地质资料, 前人对羌塘地区侏罗系布曲组岩相古地理展布存在争议, 缺少对岩相古地理演化的精细刻画。为探讨侏罗系布曲组地层特征以及各时期岩相古地理演化特征, 通过对羌塘地区周缘野外地质剖面考察、钻井岩心观察以及各项沉积标志的识别, 在地层格架内, 对侏罗系布曲组岩相古地理展布及其演化特征进行研究。结果表明, 在中侏罗世, 羌塘盆地继承了早侏罗世以来裂解拉张的演化历史, 受洋盆拉张的影响, 羌塘盆地主要发育被动大陆边缘盆地, 其上主要发育局限台地和开阔台地相古地理单元, 相带沿北—南向展布, 水体自北向南逐渐变深, 形成局限台地-开阔台地-陆棚的沉积格局。在布曲组一段中, 北羌塘坳陷发育局限台地内蒸发环境下的白云岩, 属于优质储层, 是未来主要勘探目的层。 |
| 中文关键词:羌塘盆地 侏罗纪 布曲组 岩相古地理 |
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| Lithofacies Paleogeographic Characteristics of Middle Jurassic Buqu Formation in the Qiangtang Basin of Xizang and Its Oil-gas Geological Significance |
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| 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 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. |
| keywords:Qiangtang Basin Jurassic Buqu Formation lithofacies paleogeography |
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