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《Geological Journal of China Universities》 2009-03
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Characteristics of Mesozoic Basin of the Northern Qaidam:A Case Study on Dachaidan Depression

LOU Qian-qian1,2,XIAO An-cheng1,2,YANG Hao3,HUANG Hong-sheng4,DING Wei-xing4,SHEN Zhong-yan1,2,WANG Liang1,2,CHEN Yuan-zhong5,SHEN Ya5,WANG Li-qun6,ZHOU Su-ping6(1.Department of Earth Sciences,Zhejiang University,Hangzhou 310027,China;2.Research Center for Structures in Oil and Gas Bearing Basins,Ministry of Education,Hangzhou 310027,China;3.Guangzhou Seismology Bureau,Guangzhou 510070,China;4 .Jiangsu Petroleum Exploration Bureau,Yangzhou 225009,China;5.Dunhuang Branch of Eastern Geophysics Company,P etroChina,Dunhuang 736200,China;6.Qinghai Petroleum Company,PetroChina,Dunhuang 736200,China)  
The Mesozoic strata are the key of hydrocarbon target in the northern Qaidam Basin.Combined the seismic data and geologic field materials,the residual distribution maps of Jurassic and Cretaceous strata and the fault system maps were generated. Meanwhile,the cross sections before and after erosion in Jurassic and Cretaceous times were revealed by cross section restoration.Based on the synthetic analyses of Jurassic and Cretaceous residual strata distribution,faults systems and cross-section evolution,we proposed that the northern Qaidam Basin experienced three phases of basinal evolution during the Mesozoic:A series of small faulted-basins developed in the Early Jurassic northern Qaidam in an extensional environment;Afterwards,these small faultbounded basins were covered by a larger depression basin in the Middle Jurassic to Early Cretaceous;During the Late Cretaceous,the northern Qaidam basin was reversed and wholly uplifted,resulting in formation of palaeo-uplifts.
【Fund】: 国家“十五”科技攻关资助项目(2004BA616A-04-01);; 中国石化江苏油田公司资助项目(JS06004)
【CateGory Index】: P618.13
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