重磁资料在鄂尔多斯盆地西南缘基底研究中的应用

doi:10.11720/wtyht.2020.1227

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Abstract

Based on the aeromagnetic data of the latest high precision of 1∶50 000 and the existing gravity data of 1∶200 000 in 2016 in the southwestern margin of Ordos Basin, data processing was carried out. 1crust fault, 11 basement faults,3 cap rock faults and range of the southern central uplift. Using joint inversion of gravity and magnetic data the depth and thickness of basement and cap rock is roughly understood. The analysis indicates that the gravity field mainly reflects the difference in density between the Ordovician and its overlying sedimentary cover, and the magnetic field mainly reflects the structure of the crystalline substrate. Combined with joint inversion of gravity and magnetic data, the top surface depth of the Ordovician system and the crystallographic basement depth were extracted respectively using gravity data and aeromagnetic data by Euler deconvolution and source parameter imaging, and the basement lithofacies were studied. All that provided an important basis for the prediction of oil and gas in the area. The study believes that the use of high-precision aeromagnetic data combined with gravity data can identify base features effectively and make up for the lack of other geophysical data.

Key words： the southwestern margin of Ordos Basin joint inversion of gravity and magnetic data Eular deconvolution source parameter imaging basement structure basement depth

Received: 25 April 2019 Published: 03 March 2020

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	Articles by authors
	Yuan-Li NING
	Zi-Yang ZHOU
	Dong-Hua SUN

Cite this article:

Yuan-Li NING,Zi-Yang ZHOU,Dong-Hua SUN. The application of magnetic and gravity data on research the basement in the southwest of Ordos Basin[J]. Geophysical and Geochemical Exploration, 2020, 44(1): 34-41.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1227 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I1/34

Landscape image map of study area

Aeromagnetic anomaly map of study area

Gravity anomaly map of study area

The map of basement structure inferred from aeromagnetic and gravity data in study area

The results of joint inversion of gravity and magnetic data
a—the position of inversion profile; b— the results of joint inversion of gravity and magnetic data of A—A' profile; c— the results of joint inversion of gravity and magnetic data of B—B' profile
1—Cretaceous-Quaternary; 2—Triassic-Jurassic; 3—Carboniferous-Quaternary; 4—Cambrian-Ordovician; 5—Archean Erathem-Proterozoic group; 6—intermediate to basic rocks; 7—inference compressional fault and number; 8—inference fault and number; 9—inference boundary stratotype; 10—measured profile; 11—fit profile; 12—inversion section and number; 13—residential area; 14—study area

Density and magnetic parameters of main layers in study area

The minimum buried depth map of magnetic basement in study area

The top surface depth map of Ordovician system

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