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Seismic full waveform and gravity joint inversion method for crustal three-dimensional density structure

A technology of joint inversion and seismic waveform, applied in the fields of seismology, seismic signal processing, geophysical measurement, etc., can solve the problems of low sensitivity of seismic wave field density, not well improved density imaging resolution, etc. rate, reducing the effect of inversion ambiguity

Active Publication Date: 2019-09-10
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0007] Although full waveform inversion can effectively improve the resolution of velocity imaging, it does not improve the resolution of density imaging very well, mainly due to the low sensitivity of the seismic wave field to density, and it is necessary to introduce gravity constraints to improve density imaging

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  • Seismic full waveform and gravity joint inversion method for crustal three-dimensional density structure
  • Seismic full waveform and gravity joint inversion method for crustal three-dimensional density structure
  • Seismic full waveform and gravity joint inversion method for crustal three-dimensional density structure

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Embodiment Construction

[0068] In order to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0069] It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0070] Terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a", "said" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0071] A combined seismic full waveform and grav...

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Abstract

The invention provides a seismic full waveform and gravity joint inversion method for a crustal three-dimensional density structure, and relates to the technical field of regional crustal three-dimensional structure imaging. The respective advantages of gravity and an earthquake can be fully exerted, non-uniqueness of inversion of a gravity method is reduced, and the density imaging resolution iseffectively increased. The method comprises the steps that wide-frequency seismic waveform data and Bouguer gravity anomaly data are obtained; a crustal three-dimensional V, V<s> velocity and density initial model is established; and seismic full waveform and gravity joint inversion is conducted by utilizing the Bouguer gravity anomaly data and the wide-frequency seismic waveform data, and thusa crustal three-dimensional density fine structure model is obtained. According to the technical scheme, the seismic full waveform and gravity joint inversion method is suitable for the process of crustal three-dimensional structure imaging.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of three-dimensional structure imaging of the crust, in particular to a combined seismic full waveform and gravity inversion method of the three-dimensional density structure of the crust. [0003] 【Background technique】 [0004] The gravity method is one of the important methods for the study of deep structure and regional structure. It is easy to achieve high-resolution regional coverage and high horizontal resolution. Gravity inversion is the main method to obtain the density structure of the crust and mantle. However, gravity inversion has inherent multi-solution and low depth resolution. It is necessary to introduce prior information constraints to reduce multi-solution and improve depth resolution. Seismic tomography is the main method to obtain the crust-mantle velocity structure with high depth resolution. Therefore, the development of joint seismic and gravity inversion technology, realizin...

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Application Information

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IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/282G01V1/302G01V2210/6165
Inventor 郭良辉
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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