| 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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| 引用本文：吴珍汉,王涛,季长军,刘志伟,冯伟平,邢占涛,陈云.2025.北羌塘坳陷清水湖地区侏罗系油藏特征与形成时代[J].地球学报,46(3):663-670. |
| DOI：10.3975/cagsb.2025.042701 |
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| 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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| 中文摘要:北羌塘拗陷南部清水湖地区侏罗纪海相沉积期形成了优质烃源岩、不同类型储层和优质盖层, 侏罗系烃源岩自早白垩世以来长期处于未成熟-低成熟状态, 新生代早期逆冲推覆及构造改造导致侏罗系生排烃和油气成藏。野外观测、二维地震及钻探揭示, 清水湖地区中下侏罗统夏里组中段、布曲组中上段、雀莫错组中下段各发育1套含油裂缝型碳酸盐岩储层, 雀莫错组上段发育1套含油裂缝砂岩储层, 夏里组下段发育1套油页岩; 油层厚度累计超过100 m, 储层可动油主要聚集于古近纪构造裂缝。中侏罗统布曲组主力油层厚度50~70 m, 富含轻质原油, 伴生天然气。清水湖地区含油裂缝储层、主力油层及油页岩大面积分布于中下侏罗统不同层位, 有望形成大油气田。 |
| 中文关键词:主力油层 裂缝储层 油气成藏时代 中下侏罗统 清水湖地区 |
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| Characteristics and Formation Time of Oil Reservoirs in Jurassic System of the Qingshuihu Area, Northern Qiangtang Depression |
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| Abstract: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. |
| keywords:main oil layer fractured reservoir oil accumulation period Middle–Lower Jurassic Qingshuihu area |
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