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Hybrid two-dimensional seismic travel time calculating method

A calculation method and seismic wave technology, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve problems such as complex implementation process and limited calculation accuracy, and achieve the effect of improving calculation accuracy and calculation efficiency

Inactive Publication Date: 2018-05-25
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] From the above examples, it can be seen that the existing calculation methods for fast advancing seismic wave traveltime can improve the calculation accuracy to a certain extent, but the implementation process is complicated, and the improved calculation accuracy is also limited

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  • Hybrid two-dimensional seismic travel time calculating method
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  • Hybrid two-dimensional seismic travel time calculating method

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] figure 1 It is a flow chart of a method for calculating travel time of mixed two-dimensional seismic waves. The figure shows the implementation process of the method of the present invention, specifically as follows:

[0028] 1) Reading in relevant parameter files and velocity models, wherein the parameter files include the number of grid points, grid spacing and source locations of the velocity model.

[0029] 2) Rays are fired in different directions from the shot point. The angle range of the rays is -90° to +90°, and the angular interval between the rays is 3° to 10°. Use the Longo-Kutta method to solve the kinematic rays The central ray information is obtained by tracing the equation group, as shown in the following formula:

[0030]

[0031] where x i Indicates the spatial position, p i Represents the slowness comp...

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Abstract

The invention discloses a hybrid two-dimensional seismic travel time calculating method. The method comprises the steps of reading in relevant parameter and speed models; emitting ray to different directions along the seismic focus and calculating central ray information; using a wavefront construction method for calculating the seismic travel time of mesh points within the ray range; classifyingfull-space mesh point travel time attributes and building an initial narrow band on the basis of the attributes; using a fast marching method for calculating the remaining mesh point seismic travel time. By adopting the narrow band technology, the fast marching method and the wavefront construction method are connected, and the seismic travel time calculation precision of the small region near theseismic focus is improved through the wavefront construction method, so that the remaining region mesh node calculation precision of the fast marching method is improved, and two-dimensional seismictravel time calculation achieving the calculation efficiency and the calculation precision is achieved.

Description

technical field [0001] The invention relates to the field of seismic wave travel time calculation, in particular to a hybrid two-dimensional seismic wave travel time calculation method. Background technique [0002] "Journal of Engineering Geophysics" No. 3, 2009 published "Analysis and Improvement of the Calculation Accuracy of the Rapid Advance Method" by Zhang Shuangjie et al., and introduced two methods to improve the calculation accuracy of the Rapid Advance Method. One is to use the high-order difference scheme for calculation; It is to perform local fine processing on the grid nodes near the source point, use the high-order difference scheme to calculate near the source, and use the low-order difference scheme to calculate in the remaining area. And through these two methods to calculate the seismic travel time of the homogeneous medium model, the experimental results have obtained relatively good results. [0003] "World Geology" published the third issue of 2016, "...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/305G01V2210/671G01V1/282
Inventor 孙辉孙章庆张志厚张平孟繁昌邹时贵夏龙龙邓瑞李梦黎佳宾刘丁毅钟雨田张杰
Owner SOUTHWEST JIAOTONG UNIV
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