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Gravity-magnetic interface inversion-based geodetic heat flow estimation method

An inversion algorithm and interface technology, which is used in electrical/magnetic exploration, re-radiation of sound waves, geophysical measurements, etc. It can solve the iterative convergence instability of the inversion algorithm, damage the high-frequency information of the data, and reduce the accuracy of the inversion results. And other issues

Active Publication Date: 2019-11-29
JILIN UNIV
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Problems solved by technology

The improved Parker-Oldenburg inversion algorithm has unstable iterative convergence. Although filters can be added to make it converge, the use of filters will damage the high-frequency information of the data and reduce the accuracy of the inversion results

Method used

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  • Gravity-magnetic interface inversion-based geodetic heat flow estimation method
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  • Gravity-magnetic interface inversion-based geodetic heat flow estimation method

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Embodiment

[0109] Such as figure 1 As shown in , a method for estimating terrestrial heat flow based on gravity-magnetic interface inversion includes the following steps:

[0110] (S1) Utilize the improved Parker-Oldenburg interface inversion algorithm to invert the gravity and magnetic data to obtain the Curie and Moho surfaces, and the inversion algorithms of the Moho surface and Curie are respectively:

[0111]

[0112] Among them, h 0 Indicates the average depth of the upper and lower interfaces, Δh 2 and Δh 1 Indicates the difference between the upper and lower interfaces and the average depth, s indicates the iteration step size, ρ 0 Indicates the remaining density of the surface geological medium, ω indicates the circular wave number, F[] indicates the Fourier transform of the gravity anomaly, Δg indicates the gravity anomaly, G indicates the gravitational constant, and a indicates the density variation index with depth;

[0113]

[0114]where Δz represents the magnetic ...

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Abstract

The invention discloses a gravity-magnetic interface inversion-based geodetic heat flow estimation method. The method includes the following steps that: (S1) inversion is carried out on gravity and magnetic data through an improved Parker-Ordenburg interface inversion algorithm, so that a Curie surface and a Moho surface can be obtained, wherein the Curie surface and the Moho surface are calculated through inversion algorithms described in the descriptions of the invention; and (S2) a geothermal target area is evaluated through the Curie surface and the Moho surface. According to the inversionalgorithms of the Curie surface and the Moho surface, h0 is the average depth of an upper interface and lower interface; Delta h2 and Delta H1 are the difference values of the upper interface and thelower interface, and the average depth; s is an iteration step length; rho0 is the residual density of an earth surface geological medium; omega is a circular wave number; F [] is the Fourier transform of a gravity anomaly; Delta g is the gravity anomaly; G is a gravitation constant; a is the index of the change of density along with depth; Delta z is a magnetic anomaly; mu 0 is vacuum magnetic conductivity; and b is the index of the change of magnetic susceptibility along with depth. With the method of the invention adopted, the precision and resolution of interface inversion can be enhanced, and calculation efficiency is improved. The method has very high practical value and promotional value.

Description

technical field [0001] The invention belongs to the technical fields of geothermal field, geophysical gravity prospecting and geophysical magnetic prospecting, and in particular relates to a method for estimating heat flow in the earth based on gravity-magnetic interface inversion. Background technique [0002] In recent years, global environmental pollution and energy shortages have become more and more serious. It is an urgent need to use clean and renewable energy to replace traditional fossil energy such as oil and coal. Geothermal energy is a clean, renewable and widely distributed energy source, and it is an ideal target energy source. [0003] Geothermal resources have a certain buried depth, so it is difficult to explore and evaluate geothermal resources. At present, the commonly used geothermal resource exploration methods are mainly divided into three categories, namely geophysical methods, geochemical methods and drilling methods. Drilling is a direct measurement...

Claims

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Application Information

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IPC IPC(8): G01V9/00G01V3/08G01V7/00
CPCG01V3/087G01V7/00G01V9/00
Inventor 曾昭发王卓刘卓李静
Owner JILIN UNIV
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