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A bilinear traveltime disturbance interpolation method for 3D seismic ray tracing

A technology of ray tracing and interpolation method, applied in the field of seismic exploration, to achieve the effect of high-precision calculation, easy implementation and high calculation accuracy

Inactive Publication Date: 2020-05-19
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the irregular hexahedral unit, the four nodes on the unit boundary may not be on the same plane, that is, the unit boundary surface may be a curved surface, and the travel time disturbance interpolation equation based on the unit boundary as a plane is not suitable for this case

Method used

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  • A bilinear traveltime disturbance interpolation method for 3D seismic ray tracing
  • A bilinear traveltime disturbance interpolation method for 3D seismic ray tracing
  • A bilinear traveltime disturbance interpolation method for 3D seismic ray tracing

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Embodiment 1

[0056] Such as Figure 1 to Figure 6 As shown, the bilinear traveltime disturbance interpolation method of the three-dimensional seismic ray tracing of the present invention comprises the following steps:

[0057] Step S1: Establish a three-dimensional velocity model, determine the size of the discrete grid in each formation according to the interface of each formation and the velocity change, discretize the three-dimensional velocity model into a series of irregular hexahedral units, and set the position of the shot point and the receiving point;

[0058] Step S2: if figure 2 As shown, starting from the shot point, the wavefront is expanded using the group wavefront expansion algorithm (GMM). Record the wave front travel time value at the shot point as 0, and record K=2, indicating that the wave front travel time has been obtained at this location. The wave front travel time values ​​of other grid nodes are all recorded as infinity, and K=0, which means that the grid node ...

Embodiment 2

[0096] In order to further explain the realization idea and implementation process of this method and prove the accuracy of the method, the three-dimensional velocity model is used for testing, and the calculation results are compared with the calculation results of the three-dimensional linear travel time interpolation method. Because the theoretical ray of the uniform-velocity model is a straight line, the uniform-velocity model is chosen to facilitate the explanation of ray tracing and traveltime calculation errors.

[0097] S1: Establish a constant velocity model with a speed of 2000m / s, and the model size is 3500×3500×3500m 3 , the discrete grid size is 50×50×50m 3 , the shot point is located at (1000m, 1000m, 3200m), and there are 9 receiving points in total, which are evenly distributed at a distance of 400m on the straight line connecting receiving point 1 (3000m, 200m, 0m) and receiving point 9 (3000m, 3400m, 0m);

[0098] S2: Apply the group wavefront expansion algo...

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Abstract

The invention relates to a bilinear travel time disturbance interpolation method for three-dimensional seismic ray tracing, and belongs to the technical field of seismic exploration. The method comprises the following steps that a three-dimensional velocity model is established, and positions of a shot point and demodulator probe are set; wavefront is expanded from a seismic focus point; wave propagation time on a grid node adjacent to a seismic focus is calculated to form a wavefront narrowband; a secondary seismic focus point is found from the wavefront narrowband according to a rule; wave propagation time on a grid node adjacent to the secondary seismic focus point is calculated; the wavefront is continuously expanded forward until the wavefront travel time of all the grid nodes of themodel is calculated; starting from the demodulator probe, the point of intersection of a ray and a discrete element boundary is calculated reversely; the point of intersection is taken as a new demodulator probe, the last step is repeated until the unit where the shot point is located is traced; the shot point, the point of intersection of the ray and each unit boundary and the demodulator probe are connected in sequence, and a nonstop wave ray path connecting the shot point and the demodulator probe is obtained; the high-precision calculation of the seismic travel time and ray tracing in a three-dimensional complex medium is realized.

Description

technical field [0001] The invention relates to a bilinear traveltime disturbance interpolation method for three-dimensional seismic ray tracing, belonging to the technical field of seismic exploration. Background technique [0002] Seismic ray tracing is a fast and effective technique for studying seismic waves, and is widely used in seismic tomography, migration imaging, earthquake location, and seismic data acquisition design. Linear traveltime interpolation method includes two-dimensional traveltime interpolation method and three-dimensional traveltime interpolation method, which is one of the main methods for seismic traveltime calculation and ray tracing. This method assumes that the travel time varies linearly along the boundary of the discrete unit, and the travel time of any point on the unit boundary can be expressed by linear interpolation of the travel time on the adjacent discrete grid nodes. [0003] In fact, the travel time on the cell boundary changes nonlin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/36
CPCG01V1/282G01V1/36G01V2210/671
Inventor 张建中
Owner OCEAN UNIV OF CHINA