Structural constraint-based normalized gravity-magnetic-electric-seismic joint inversion method

A joint inversion and structure-constrained technology, applied in geophysical surveying, instruments, etc., can solve the coupling problems of large different physical parameters, cannot deal with complex model problems, and does not consider the normalized order of magnitude difference, etc., to reduce the inversion Multiple solutions, avoiding direct coupling inversion, and improving the effect of resolution

Inactive Publication Date: 2018-10-19
JILIN UNIV
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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a normalized joint inversion method of gravity, magnetism, electric and seismic based on structural constraints, so as to solve the problem that the existing jo

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  • Structural constraint-based normalized gravity-magnetic-electric-seismic joint inversion method

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[0056] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0057] Such as figure 1 As shown, the present invention provides a normalized gravity-magnetic-electric-seismic joint inversion method based on structural constraints, including the following steps:

[0058] S1: Establish a normalized joint inversion objective function, the joint inversion objective function is as formula (1):

[0059]

[0060] Cross-gradient constraints: τ(m)=0

[0061] in:

[0062]

[0063]

[0064]

[0065] C d =diag[C d1 ,C d2 ,C d3 ,C d4 ], C m =diag[C m1 ,C m2 ,C m3 ,C m4 ],

[0066] α=[α 1 ,α 2 ,α 3 ,α 4 ],

[0067]

[0068] Among them, m is the model parameter...

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Abstract

The invention discloses a structural constraint-based normalized gravity-magnetic-electric-seismic joint inversion method. The method includes the following steps that: S1, a normalized joint inversion objective function is established; S2, an initial model is established; S3, forward calculation and Jacobian matrix solving are carried out; S4, a normalized cross-gradient partial derivative and Lagrangian operator are calculated; S5, an iterative model is calculated; and S6, forward calculation is performed on the obtained iterative model, and the fitting difference of calculation results andobservation data is solved, if the fitting difference increases, the maximum number of iterations is reached, or the fitting difference reaches a threshold, loop inversion is stopped, and a normalizedjoint inversion model is outputted, otherwise S3 is executed. With the structural constraint-based normalized gravity-magnetic-electric-seismic joint inversion method of the invention adopted, the limitations of a single method are eliminated, the non-uniqueness of the inversion of geophysical inversion is decreased; and wrong inversion results caused by inversion based on the direct coupling ofphysical property parameters with large differences in order of magnitudes can be avoided. The method does not rely on the physical property relations of rock.

Description

technical field [0001] The invention relates to the field of simultaneous processing of four geophysical methods including gravity, magnetic method, magnetotelluric method and seismic first arrival wave travel time, and in particular provides a normalized gravity, magnetic, electric and seismic joint inversion method based on structural constraints. Background technique [0002] According to different petrophysical parameters, geophysical methods can be divided into gravity, magnetic, seismic, and electrical methods. Gravity and magnetic methods have good horizontal resolution and play an important role in the division of geological structure distribution, but Poor capability and shallow exploration depth; the exploration depth of magnetotelluric sounding (MT) is related to the frequency. Due to the rich frequency range, its exploration depth reaches tens or hundreds of kilometers, and it is not shielded by high-resistivity layers. Good conductor has the advantages of sensit...

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Application Information

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IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 张镕哲李桐林邓馨卉
Owner JILIN UNIV
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