Ray chromatography imaging method for refracted waves

A technology of ray tomography and imaging method, applied in the field of imaging, to achieve the effect of simple imaging steps, good imaging effect and high utilization value

Inactive Publication Date: 2011-06-15
武侯区巅峰机电科技研发中心
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Problems solved by technology

However, in practical applications, there are still some difficulties and problems in wave equation tomography, such as the extraction of scattering data, th

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[0022] The present invention will be further explained below.

[0023] The refracted wave ray tomography method is characterized in that it comprises the following steps:

[0024] (1) Data acquisition-pick up seismic travel time t m

[0025] Pick up the seismic travel time t recorded by each source-geophone m This step takes more time because the interpretation of pre-stack seismic data is essentially involved when picking up travel. Manual picking is slow and the data quality is good. Although the travel speed of automatic picking is fast, errors are prone to occur and affect the tomographic results, so manual correction is required.

[0026] (2) Establish a speed model

[0027] After the velocity model is established, forward calculation of the model is performed, and ray tracing technology is generally used to calculate the ray path and travel time t c .

[0028] (3) Establish a linear equation for inversion during travel

[0029] The linear equation is as follows:

[0030] Considering...

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Abstract

The invention discloses a ray chromatography imaging method for refracted waves, belongs to a ray imaging technology, and mainly solves the problem of ray imaging of a refracting layer in an earthquake. The ray chromatography imaging method for the refracted waves comprises the following steps of: (1) performing data acquisition, namely acquiring earthquake travel time tm; (2) establishing a velocity model; (3) establishing a linear equation of inversion of the travel time; (4) solving a velocity increment according to the travel time inversion equation; and (5) modifying the velocity model by using the solved velocity increment, solving a new velocity increment according to a new travel time inversion equation, modifying the currently used velocity model by using the new velocity increment, and repeatedly modifying until the solved velocity increment meets an inversion norm, namely the ray chromatography imaging of the refracted waves is achieved at the moment. The method is simple, easy to operate, and high in imaging quality and efficiency.

Description

technical field [0001] The invention relates to an imaging method, in particular to a refracted wave ray tomography imaging method. Background technique [0002] Seismic tomography is a new geophysical exploration method developed in the 1980s. It reconstructs the medium velocity structure underground or between wells through the travel time or waveform of seismic waves observed on the surface or between wells, so as to reveal its geological structure, lithology distribution or mineral deposit form. Dines and Lytle were the first to introduce tomography into the field of geophysics. Subsequently, McMechen, Daily, Somerstein, etc. conducted extensive research on the theory and methods of seismic tomography. Since the 1990s, seismic tomography has been practically applied. In seismic exploration, it is a very important problem to estimate the propagation velocity of waves in the subsurface medium, and tomography provides a practical method for solving the velocity estimatio...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 黄友华
Owner 武侯区巅峰机电科技研发中心
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