地质学报2025，Vol.99Issue(5)：1467-1477,11.DOI:10.19762/j.cnki.dizhixuebao.2025122
羌塘中部清水湖逆冲推覆构造对油气成藏的控制作用
Control of the Qingshuihu thrust to hydrocarbon accumulation in central Qiangtang basin
摘要
Abstract
Mechanism of hydrocarbon formation caused by the Qingshuihu thrust in central Qiangtang area is revealed by field study,seismic reflection profiling and oil drilling.Jurassic marine strata as thick as 3600 m formed high quality source rocks,variety of reservoirs and good caps in the Shenglihe and its adjacent areas southern part of the north Qiangtang depression.However,the Jurassic source rocks kept in immature-low maturity in the Cretaceous due to insufficient buried depth.India-Asia continental collision led to the formation of larger-scale Qingshuihu thrust system,which is composed of northward thrust,imbricate faults and Paleogene foreland basin in north of the central Qiangtang uplift.Structural thickening derived from Paleogene thrust and Paleocene-Eocene sedimentation loading in the foreland basin reconstructed the burial,thermal and hydrocarbon generation history of the Jurassic marine source rocks.Lower-Middle Jurassic marine source rocks of the Quemoco,Buqu and Xiali formations successively strode over hydrocarbon generation threshold in Early Eocene,and formed peak of hydrocarbon generation in Middle Eocene.Paleocene-Eocene compressive stress caused fractures in Middle Jurassic limestone of the Buqu Formation,which formed fractured limestone as well as main oil reservoir beneath the Qingshuihu thrust and its foreland basin.Jurassic marine sedimentation formed source-reservoir-cap systems,and Paleogene thrust caused hydrocarbon generation and accumulation for formation of large oil and gas fields in the Qiangtang basin.关键词
清水湖逆冲推覆构造/古近纪前陆盆地/油气成藏机理/侏罗系海相沉积/羌塘中部Key words
Qingshuihu thrust/Paleogene foreland basin/mechanism of hydrocarbon accumulation/Jurassic marine sedimentation/central Qiangtang area引用本文复制引用
吴珍汉,季长军,王涛,刘志伟,赵珍,王茜,陈云..羌塘中部清水湖逆冲推覆构造对油气成藏的控制作用[J].地质学报,2025,99(5):1467-1477,11.基金项目
本文为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)联合资助的成果. （编号DD20221855,DD20230315）
