| 羌塘盆地中—下侏罗统雀莫错组沉积特征及油气地质意义 |
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| 引用本文：占王忠,范志伟,谭富文.2025.羌塘盆地中—下侏罗统雀莫错组沉积特征及油气地质意义[J].地球学报,46(3):649-662. |
| DOI：10.3975/cagsb.2025.012221 |
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| 基金项目:中国地质调查局项目“羌塘盆地油气基础地质调查评价”(编号: DD20230266)和中石化勘探分公司科技项目“北羌塘托纳木地区中生界石油地质条件与目标评价”(编号: 35450003-23-ZC0607-0018) |
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| 中文摘要:通过对羌塘盆地中—下侏罗统雀莫错组岩石特征、沉积相及古地理分析, 认为北羌塘坳陷雀莫错组为陆缘近海湖泊相沉积, 可进一步划分为湖泊三角洲、滨湖、湖坪、咸水湖等亚相。雀莫错组沉积期咸水-半咸水湖沉积环境形成的碎屑岩-碳酸盐岩-蒸发岩等岩性组合, 有利于烃源岩的形成; 膏盐岩与白云岩共生的沉积环境及石膏向硬石膏转化形成的有机酸结晶水能有效改善盐下碳酸盐岩的储集物性; 硬石膏的塑性和致密性可以有效保护盐下油气资源免受羌塘盆地新构造运动的破坏。羌塘盆地雀莫错组的咸水湖岩性组合区域是油气勘探的有利地带, 其中白滩湖—雀莫错裂陷槽是发育该类型油气藏的有利地区。 |
| 中文关键词:岩相古地理 早—中侏罗世 咸水湖 油气资源潜力 羌塘盆地 |
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| Sedimentary Characteristics and Oil-gas Geological Significance of Lower to Middle Jurassic Quemocuo Formation in Qiangtang Basin |
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| Abstract:According to the analysis of the sedimentary lithology, sedimentary facies, and paleogeography of the Quemocuo Formation of the Lower to Middle Jurassic in the Qiangtang Basin, the Quemocuo Formation in the northern Qiangtang Basin is an offshore terrigenous freshwater lake facies, which can be further divided into lake delta, lakeshore, lake flat, saline lake, and other subfacies. The lithologic combination of clastic rock, carbonate rock, and evaporite formed in the saltwater and brackish lake sedimentary environment of the Quemocuo period is beneficial for the formation and development of source rock. The sedimentary en-vironment of gypsum salt rock and dolomite and conversion of gypsum to anhydrite can effectively improve the reservoir properties of the pre-salt carbonate rock. The plasticity and compactness of anhydrite can ef-fectively protect the pre-salt oil and gas resources from the destruction of the neotectonic movement in the Qiangtang Basin. The salt-lake lithological association of the Quemocuo Formation in the Qiangtang Basin is a favorable area for oil and gas exploration, and the Baitanhu–Quemocuo rift trough is a favorable area for this type of oil and gas reservoir. |
| keywords:lithofacies paleogeography Early to Middle Jurassic salt water lake oil and gas resource potential Qiangtang Basin |
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