二连盆地宽频大地电磁法数据精细反演处理研究——以满都拉图地区的数据为例

doi:10.11720/wtyht.2023.1491

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Abstract

This study investigated the fine inversion of the broadband magnetotelluric (BMT) data of the Mandulatu area in the Erlian Basin, aiming to improve the inversion precision and performance of BMT data and to provide an example and reference for the fine inversion of BMT data of other areas. For the fine inversion of BMT data of the study area, this study selected the OCCAM inversion method and the TM+TE data mode. The inversion accuracy of data was effectively improved when the two-dimensional moving average resistivity model was selected as the background model, the regularization factor was set to 0.4, and the thickness of the first layer was set to 40 m. This result laid a basis for the subsequent fine interpretation of data. As shown by the results of this study, the key to reducing the multiplicity of solutions and obtaining reliable inversion precision and performance of data is to conduct an adaptive experimental study of the inversion methods, data modes, and parameters first using prior information, such as known borehole or seismic data.

Key words： BMT fine inversion Erlian Basin Mandulatu

Received: 29 September 2022 Published: 11 October 2023

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	Di-Qiao XU
	Mao LI

Cite this article:

Di-Qiao XU,Mao LI. Fine inversion of the broadband magnetotelluric data of the Erlian Basin: A case study of the Mandulatu area[J]. Geophysical and Geochemical Exploration, 2023, 47(4): 994-1001.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1491 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I4/994

E14-8 Borehole histogram

Statistical of different rocks of resistivity

Comparison of inversion method for L18-5 section
a—seismic exploration stacking depth profile of line D01;b—OCCAM 2D inversion resistirity section of L18-15 line;c—two dimensional inversion resistivity section of NLCG on L18-15 line

Comparision chart of inversion results of different data near borehole

Comparision of inversion results of different background models near the borehole

Comparision of inversion results of different grids near the borehole

Comparision diagram of inversion results of different regularization factors beside borehole

Typical section inversion resistivity and geological inference interpretation profile

Comparison between resistivity inversion section and E14-6 borehole data

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