摘要
鄂尔多斯盆地奥陶纪中央古隆起是盆地内的重要油气聚集区，其成因一直是大家关注的热点．利用丰富的钻井资料对古隆起中东部地区中奥陶统马五段地层的沉积特征进行详细的分析，编制出了马五段各层段的厚度等值线图，圈出了各时期的沉降中心位置，发现在马五8～马五；时期，沉降中心基本以向南迁移为主，伴随着一定程度的向西迁移；在马五。。到马五。’时期，沉降中心、以向西的迁移为主，伴随微弱的向南迁移．这种迁移过程支持鄂尔多斯盆地西、南缘在奥陶纪时发育双前陆盆地，“L”型中央古隆起是在早一中奥陶世时受该双前陆盆地前缘隆起相互叠加的影响．
The central paleo-uplift in the Ordos basin is an important hydrocarbon accumulation zone. How it formed is now a hot topic and attracting lots of attentions. In this paper, the sedimentary characteristics of the 5th unit of the middle Ordovician Majiagou Formation （M5） in the mid-eastern part of the paleo-uplift from drilling data are an- alyzed in detail and the isopach maps are compiled. Then the positions of the depocenter for each period are circled. It is found that the depocenter migrated mainly southward and weakly westward during the deposition of 8th~ 5＇h member of M5, while mainly westward and weakly southward during the deposition of 4th member of M5. These observations support that there were dual foreland basins in the southern and western margin of the Ordos basin dur- ing the Ordovician, and that the L shaped central paleo-uplift formed due to the superimposed effects of the fore- bulges of these two foreland basins during the early Ordovician.
出处
《浙江大学学报（理学版）》
CAS
CSCD
2014年第1期100-107,共8页
Journal of Zhejiang University（Science Edition）
基金
国家"十二五"重大专项资助项目(2011zx05003-002
2011zx05009-001)
中国石油天然气股份有限公司长庆油田分公司资助项目(H20110461)
关键词
鄂尔多斯盆地
中央古隆起
奥陶纪
马家沟组
沉积特征
Ordos basin
central paleouplift
Ordovician
Majiagou Formation
sedimentary characteristics
