| 北羌塘坳陷清水湖地区侏罗系油藏特征与形成时代 |
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| 关键词:main oil layer fractured reservoir oil accumulation period Middle–Lower Jurassic Qingshuihu area |
| 基金项目:中国地质调查局地质调查项目(编号: DD20221855; DD20230315)、陕西省煤田地质集团项目(编号: SMDZ-2022ZD-8; SMDZ-2021-1)、国家自然科学基金项目(编号: U24A20597)、深地国家科技重大专项(编号: 2024ZD1001005)和西藏自治区科技计划项目(编号: XZ202401YD0006; XZ202403ZY0040) |
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| Characteristics and Formation Time of Oil Reservoirs in Jurassic System of the Qingshuihu Area, Northern Qiangtang Depression |
| High-quality marine source rocks, various types of reservoirs and and high-quality caps were formed in the southern Qingshui Lake area in the southern part of the northern Qiangtang depression during the Jurassic. The Jurassic marine source rocks have remained in an immature to low maturity state since the Early Cretaceous. Early Cenozoic thrusting and tectonic reworking resulted in hydrocarbon formation and oil accumulation. Field studies, seismic reflections, and drilling revealed that oil-bearing fractured carbonate reservoirs formed in the middle section of the Middle–Lower Jurassic Xiali Formation, the middle-upper section of the Middle–Lower Jurassic Buqu Formation, and the middle-lower section of the Middle–Lower Jurassic Quemocuo Formation. An oil-bearing fracture sandstone reservoir formed in upper section of the Quemocuo Formation. And oil shales formed in the lower section of the Xiaoli Formation. Oil layers in the Jurassic system are more than 100 m thick, with the movable oil in the reservoirs mainly concentrated in the Paleogene fractures of the reservoirs. Valuable oil flow and accompanying gas flow were detected in the Middle Jurassic fractured limestone of the Buqu Formation, where main oil layer reaches a thickness of 50–70 m. Oil-bearing fractured reservoirs, main oil layer, and oil shales are distributed regionally in the Jurassic system, and we predict that large oil and gas fields may exist in the Qingshuihu area. |
| WU Zhenhan,WANG Tao,JI Changjun,LIU Zhiwei,FENG Weiping,XING Zhantao,CHEN Yun.2025.Characteristics and Formation Time of Oil Reservoirs in Jurassic System of the Qingshuihu Area, Northern Qiangtang Depression[J].Acta Geoscientica Sinica,46(3):663-670. |
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