| 鄂尔多斯白垩系自流水盆地沉积特征、岩性分布与盆地演化规律 |
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| 关键词:Ordos basin Cretaceous,artesian basin sedimentary facies lithology basin evolution |
| 基金项目:国家“973”项目(编号:2003CB214607); 国土资源部“十五”重大项目“鄂尔多斯盆地地下水勘查”(编号:1212010331302) |
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| Depositional Characteristics, Lithologic Facies Distribution and Evolution Pattern of Cretaceous Artesian Basin in Ordos |
| Ordos basin is one of the Cretaceous aquifer basins in China,where sedimentary facies and basin evolution constitute one of the important factors affecting the development of water-bearing formation and water content.Based on boundary features,basin structure,sedimentary environment and sediments of this basin,the authors discussed the relationships between basin evolution and distribution pattern,sedimentary facies of water-bearing formation and water content.It is indicated that,during early Cretaceous,its axis extended from south to north,and its disequilibrium subsidence appeared in E-W direction and its configuration was asymmetrical,being flat-dipping in the east and steeply-inclined in the west.Three main water-bearing formations,namely Luohe formation,Huanhe-Huachi formation and Luohandong formation,were controlled by structural evolution and sedimentary facies.Luohe formation was developed extensively,while Huanhe-Huachi formation and Luohandong formation were distributed locally.Stratigraphic thickness at the center of the subsidence was thicker than that along the uplift zone around Ordos basin.Alluvial fans,river facies and distributary channels of the delta front were mostly distributed along the basin margin,whose lithologic characters were mostly sandy conglomerate and sandstone.Thus,aeolian desert facies,delta front and lacustrine facies are distributed at the center,whose lithologies were composed of sandstone and mudstone.Among all sedimentary facies,the aeolian desert facies sandstone of Luohe formation constitutes the best water-bearing bed,which is attributed to stable attitude,large distribution area,high textual maturity,high porosity and permeability,low heterocompound and soluble components,and reasonable spatial matching relations of roofs and floors. |
| YANG You-yun,ZHANG Ying-li,HOU Guang-cai.2008.Depositional Characteristics, Lithologic Facies Distribution and Evolution Pattern of Cretaceous Artesian Basin in Ordos[J].Acta Geoscientica Sinica,29(4):405-413. |
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