| 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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| 关键词:lithofacies paleogeography Early to Middle Jurassic salt water lake oil and gas resource potential Qiangtang Basin |
| 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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| 摘要: |
| Sedimentary Characteristics and Oil-gas Geological Significance of Lower to Middle Jurassic Quemocuo Formation in Qiangtang Basin |
| 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. |
| ZHAN Wangzhong,FAN Zhiwei,TAN Fuwen.2025.Sedimentary Characteristics and Oil-gas Geological Significance of Lower to Middle Jurassic Quemocuo Formation in Qiangtang Basin[J].Acta Geoscientica Sinica,46(3):649-662. |
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