【摘要】 文中从地球物理角度对鄂尔多斯盆地航磁特征与地质构造进行了分析,确定了盆地的边界及范围,并在编制鄂尔多斯盆地磁性基底深度图、构造区划图的基础上,对盆地的基底结构、性质及其深度变化特点和构造格局、盖层厚度等方面进行了研究,表明鄂尔多斯盆地基底由前震旦系变质岩系组成,埋深大部分可达3 000～11 000 m,盖层为震旦纪一古生代和中新生代地层;盆地的发生和发展主要受近EW向、NE向和SN向构造制约,多呈隆坳相间排列的特点,盆地构造面貌北部构造走向呈EW向,中东部构造走向呈NE向,西缘构造走向呈SN向。这些认识为今后在该盆地进行油气勘探提供了参考依据。更多还原

【Abstract】 According to aeromagnetic and gravitational data,the boundary and range of Ordos basin were determined based on an analysis of the characteristics of gravity and magnetic fields. And on the basis of compiling depth map of the metamorphic basement and structuring zoning map,research was conducted on the basin’s basement structure,characteristics and features of depth change,structure framework,and caprock thickness. The research indicates that the metamorphic basement is composed of Proterozoic metamorphic series,and the buried depth of crystalline basement can reach 5 000 to 20 000 meters. The caprock is the layers of Ediacaran,Paleozoic,and Mesozoic. The occurrence and development of the basin are restricted by nearly NE-and NWW-trending structures,forming a pattern of four depressions and three uplifts. All the new understanding and conclusions provide a reference for further oil and gas exploration in the basin.更多还原