[an error occurred while processing this directive] 高校地质学报 2009, 15(3) 407-416 DOI:     ISSN: 1006-7493 CN: 32-1440/P

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楼谦谦
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陈元忠
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柴达木盆地北缘中生代盆地性质研究——对大柴旦凹陷的解剖
楼谦谦1,2,肖安成1,2*,杨 浩3,黄宏升4,丁卫星4,沈中延1,2,王 亮1,2,陈元忠5,沈 亚5,汪立群6,周苏平6
1. 浙江大学 地球科学系,杭州 310027;2. 教育部含油气盆地构造研究中心,杭州 310027;3. 广东省地震局,广州 510070;4. 中国石化 江苏油田公司,扬州 225009; 5. 中国石油 东方地球物理公司敦煌分院,敦煌 736200;6. 中国石油 青海油田分公司,敦煌 736200
摘要: 柴达木盆地北部地区的中生代地层是柴达木盆地油气勘探的重点层系之一。利用地震剖面解释成果和野外地质资料绘制了侏罗纪与白垩纪的地层残余分布图和断裂分布图;利用平衡剖面对地震剖面进行了平衡恢复,恢复了侏罗纪与白垩纪的原始与剥蚀后形态。通过对中生代各期(主要是侏罗纪和白垩纪)残余地层、断裂的分布和地震剖面构造演化的综合分析,认为柴达木盆地北部地区中生代经历了三个不同性质的盆地演化阶段:早侏罗世为伸展环境下的(箕状)断陷盆地,主要表现为一系列小型断陷盆地群;中侏罗世—早白垩世为伸展型坳陷盆地;晚白垩世末盆地受挤压整体隆升,形成古隆起。
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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,PetroChina, Dunhuang 736200, China; 6. Qinghai Petroleum Company, PetroChina, Dunhuang 736200, China
Abstract: 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.
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收稿日期 2009-09-20 修回日期 2009-09-20 网络版发布日期  
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