鄂尔多斯盆地的磁场特征及地质意义

doi:10.11720/wtyht.2019.1391

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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。

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	李冰
	宋燕兵
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	王启
	蒋久明
	金久强
	周德文
	徐明
	肖刚毅
	谢民英

关键词 ：鄂尔多斯盆地, 航磁, 基底结构及深度, 构造特征, 断裂

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.

Key words： Ordos Basin aeromagnetic survey basement structure and depth structural feature rupture

收稿日期: 2018-10-29 出版日期: 2019-08-15

P631

基金资助:中国地质调查项目“中国陆域航磁特征及地质构造研究”(1212011087009)

作者简介: 李冰(1966-),毕业于长安大学地球物理勘探专业,长期从事航磁油气地质勘探资料成果及研究工作。Email: zeqing0102@163.com

引用本文:

李冰, 宋燕兵, 石磊, 王启, 蒋久明, 金久强, 周德文, 徐明, 肖刚毅, 谢民英. 鄂尔多斯盆地的磁场特征及地质意义[J]. 物探与化探, 2019, 43(4): 767-777.
Bing LI, Yan-Bing SONG, Lei SHI, Qi WANG, Jiu-Ming JIANG, Jiu-Qiang JIN, De-Wen ZHOU, Ming XU, Gang-Yi XIAO, Min-Ying XIE. Characteristics of gravity and magnetic fields in Ordos Basin and their geological significance. Geophysical and Geochemical Exploration, 2019, 43(4): 767-777.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.1391 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I4/767

Fig.1 鄂尔多斯盆地构造区划^[12]

Fig.2 鄂尔多斯磁性基底深度

Fig.3 鄂尔多斯盆地及周缘航磁ΔT等值线平面

Fig.4 鄂尔多斯盆地及周缘航磁ΔT化极等值线平面

Fig.5 鄂尔多斯盆地及周缘航磁ΔT化极垂向一阶导数等值线平面

Table 1

Table 2 鄂尔多斯盆地钻井揭露前震旦系深度与计算深度对比

Fig.6 鄂尔多斯盆地构造区划
F₁ —鄂尔多斯西缘断裂;F₂ —包头—朝阳断裂;F₃ —鄂托克—集宁断裂;F₄—大同—吴起断裂;F₅ —秦岭北缘断裂; Ⅰ—河套坳陷;Ⅱ—磴口坳陷;Ⅲ—伊盟隆起;Ⅳ—贺兰山隆起;Ⅴ—鄂托克旗坳陷;Ⅵ—乌审旗隆起;Ⅶ—府谷隆起;Ⅷ—志丹坳陷;Ⅸ—延安隆起;Ⅹ—渭北隆起;Ⅺ—洛川坳陷;Ⅻ—渭河坳陷;ⅩⅢ—天环坳陷;ⅩⅣ—西缘逆冲构造带;ⅩⅤ—堡子湾—靖边隆起;ⅩⅥ—定边坳陷

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