Hybrid network minimum travel time ray tracing tomography method

A technology of tomography and ray tracing, applied to seismic signal processing, etc., to reduce the number of grids and solve the problem of large storage capacity

Inactive Publication Date: 2014-04-02
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0020] In order to overcome the shortcomings of the single-grid ray-tracing tomography method in the model parameterization of the geological tomography technology, the present invention provides a hybrid network ray-tracing tomography method

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  • Hybrid network minimum travel time ray tracing tomography method
  • Hybrid network minimum travel time ray tracing tomography method

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Embodiment Construction

[0057] The hybrid mesh ray tracing tomography method of the present invention will be further described below with reference to the accompanying drawings.

[0058] Step 1, data acquisition, that is, to pick up the travel time t of the first arrival from each source to the receiving transducer m ;

[0059] Step 2: Establish the imaging region geometry;

[0060] Establish the background network of the imaging area according to the boundary geometric features, prior information, etc., including the setting of the initial grid density, etc., to lay the foundation for the hybrid network subdivision, and at the same time establish the relative three-dimensional coordinate system of the imaging area;

[0061] Step 3: Establish the travel time information of the first arrival in the imaging area;

[0062] The travel time information of the first arrival includes: the coordinates of each source point, the coordinates corresponding to the receiving arrangement of each source point, an...

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Abstract

The invention discloses a hybrid network minimum travel time ray tracing tomography method which comprises the steps that a two-dimensional complicated external geometric boundary and an imaging area of an internal complicated space structure are split into regular rectangular sub-areas and irregular sub-areas according to geometric structures of the geometric boundary and the imaging area; the regular rectangular sub-areas are subjected to rectangular mesh subdivision; the irregular sub-areas are subjected to triangular mesh subdivision; the sound wave first arrival travel time is computed by a hybrid network wave travel plane extension method; a ray path from any receiving point to an excitation point is traced; ray path information forms a matrix equation; the matrix equation is solved by an extrapolation sequence acceleration algebra reconstruction technique; velocity distribution of a model is obtained; and finally regular mesh imaging data is formed. The method effectively solves the problem existing in single mesh subdivision, the problems of great memory capacity, long computation time, great difficulty and low efficiency during forward modelling, and the problems of poor equation condition and solving difficulty during chromatography inversion.

Description

technical field [0001] The invention relates to a geology tomography imaging technology, which is mainly applied to computer data image processing in rock mass engineering geological sound wave detection, inter-hole geological structure detection and defect detection of various artificial structures. Background technique [0002] At present, the geo-tomography technology is mainly based on the ray algebraic reconstruction method, which is called the ray tomography method. [0003] The specific method is to drill two holes in the formation, one hole is equipped with a signal excitation device, and the other hole is equipped with a signal receiving device (single or multi-channel), forming a fan-shaped observation system to measure the medium velocity in the detection area. By changing the position of the excitation point and the receiving arrangement, a densely intersecting ray network is formed, and then the regular imaging unit is divided according to the density of the ray...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 于师建
Owner SHANDONG UNIV OF SCI & TECH
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