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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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

Received: 29 October 2018 Published: 15 August 2019

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	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

Cite this article:

Bing LI,Yan-Bing SONG,Lei SHI, et al. Characteristics of gravity and magnetic fields in Ordos Basin and their geological significance[J]. Geophysical and Geochemical Exploration, 2019, 43(4): 767-777.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1391 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I4/767

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Tectonic regionalization of Ordos Basin^[12]

Magnetic basement depth of Ordos Basin

Aeromagnetism ΔT isoline plane of Ordos Basin and its surrounding area

Aeromagnetism ΔT transition polar isoline plane of Ordos Basin and its surrounding area

Vertical first derivative of aeromagnetism ΔT transition polar isoline plane of Ordos Basin and its surrounding area

Rock magnetism statistics in Ordos Basin and surrounding area

Comparison of Presinian system depth between drilling reveal and calculated in Ordos Basin

Tectonic regionalization of Ordos Basin
F₁ —fault on the western margin of Ordos;F₂ —Baotou-Chaoyang fault;F₃ —Etok-Jining fault;F₄—Datong-Wuqi fault;F₅ —Qinling northern margin fault; Ⅰ—Hetao depression;Ⅱ—Dengkou depression;Ⅲ—Yimeng uplift;Ⅳ—Helan Mountain uplift;Ⅴ—Etokqi depression;Ⅵ—Wushenqi uplift;Ⅶ—Fugu uplift;Ⅷ—Zhidan depression;Ⅸ—Yan'an uplift;Ⅹ—Weibei uplift;Ⅺ—Luochuan depression;Ⅻ—Weihe depression;ⅩⅢ—Tianhuan depression;ⅩⅣ—Western margin thrust tectonic belt;ⅩⅤ—Baoziwan-Jingbian uplift;ⅩⅥ—Dingbian depression

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