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Magnetotelluric data based resistivity and magnetic susceptibility inversion method and system

A data inversion and magnetotelluric technology, applied in the field of electrical prospecting, can solve problems such as low accuracy and cumbersome calculations

Active Publication Date: 2014-10-15
乌兰察布工业技术研究院有限公司
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method and system for retrieving resistivity and susceptibility parameters based on magnetotelluric data, which can be used to solve the problem of magnetotelluric The method of inverting the resistivity and magnetic susceptibility parameters in the data has the problems of cumbersome calculation and low accuracy

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  • Magnetotelluric data based resistivity and magnetic susceptibility inversion method and system
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  • Magnetotelluric data based resistivity and magnetic susceptibility inversion method and system

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[0049] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0050] Such as figure 1 As shown, this embodiment provides a method for retrieving resistivity and magnetic susceptibility from magnetotelluric data, including:

[0051] Step 1, in TM polarization mode, measure by N periodic points T i (i=1,2,3....N) measured value of apparent resistivity on the ground ρ ai , and based on the measured apparent resistivity ρ ai Carry out Bostick inversion to obtain N electrical layers and a virtual electrical layer N+1 (the virtual electrical layer is the bottom layer established for the inversion), and the thickness and resistivity of the i-th layer are respectively

[0052] H i = ...

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Abstract

The invention relates to a magnetotelluric data based resistivity and magnetic susceptibility inversion method, which comprises the following steps: 1, measuring the measured value of apparent resistivity of the ground in a TM (transverse magnetic) polarization mode, and establishing an initial geological model to obtain the resistivity and magnetic susceptibility of each layer of the initial geological model; 2, under the conditions of horizontally layered media, based on the resistivity and magnetic susceptibility of the initial geological model, using a one-dimensional forward modeling method to calculate the theoretical value of apparent resistivity of the ground; 3, modifying the resistivity and magnetic susceptibility of the initial geological model layer by layer; step 4, based on the modified resistivity and magnetic susceptibility, recalculating the theoretical value of apparent resistivity of the ground, if the fitting error between the measured value of apparent resistivity and the recalculated theoretical value of apparent resistivity is less than the set expected error, then stopping the modification of the resistivity and magnetic susceptibility. According to the method provided by the invention, the complicated partial derivative matrix calculation is not needed, the iterative process steadily converges, and the resistivity parameters and magnetic susceptibility parameters of the stratum can be determined layer by layer.

Description

technical field [0001] The present invention relates to the field of electrical prospecting, in particular to a method and system for retrieving resistivity and magnetic susceptibility based on magnetotelluric data, which is applicable to the interpretation of hidden underground magnetic ore bodies or hidden magnetic rock bodies, Background technique [0002] As an important exploration geophysical method, the magnetotelluric method has a wide range of applications and many branches. Since it was first proposed, the audio frequency magnetotelluric method (AMT) was proposed successively in the 1960s. In 1971, Professor D.W.Strangbway of the University of Toronto in Canada and his graduate student Myron Goldstein proposed the controlled source audio frequency magnetotelluric method (CSAMT). [0003] At present, the mainstream method of magnetotelluric data processing is still resistivity inversion. In 2002, Su Dongliu proposed the one-dimensional "forward modification" method ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G01V3/38
Inventor 于昌明邢宝山
Owner 乌兰察布工业技术研究院有限公司
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