地球学报2025，Vol.46Issue(3)：663-670,8.DOI:10.3975/cagsb.2025.042701
北羌塘坳陷清水湖地区侏罗系油藏特征与形成时代
Characteristics and Formation Time of Oil Reservoirs in Jurassic System of the Qingshuihu Area,Northern Qiangtang Depression
摘要
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.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Key words
main oil layer/fractured reservoir/oil accumulation period/Middle-Lower Jurassic/Qingshuihu area分类
天文与地球科学引用本文复制引用
吴珍汉,王涛,季长军,刘志伟,冯伟平,邢占涛,陈云..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,2025,46(3):663-670,8.基金项目
本文由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 （编号:U24A20597）
XZ202403ZY0040)联合资助. This study was supported by China Geological Survey(Nos.DD20221855 and DD20230315),Shaanxi Coalfield Geology Group(Nos.SMDZ-2022ZD-8 and SMDZ-2021-1),National Natural Science Foundation of China(No.U24A20597),Deep National Science and Technology Major Project(No.2024ZD1001005),and Science and Technology Program of Xizang Autonomous Region(Nos.XZ202401YD0006 and XZ202403ZY0040). （Nos.DD20221855 and DD20230315）
