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Numerical value simulation method and system of elastic wave field

A numerical simulation and elastic wave technology, applied in seismic signal processing and other directions, can solve the problem of incomplete absorption of reflected wave field energy

Active Publication Date: 2019-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Looking at the existing elastic wave field numerical simulation algorithms, each method has its own characteristics, but all these absorbing boundary conditions cannot completely absorb the reflected wave field energy from the boundary, but only partially absorb the reflected energy from the boundary

Method used

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  • Numerical value simulation method and system of elastic wave field
  • Numerical value simulation method and system of elastic wave field
  • Numerical value simulation method and system of elastic wave field

Examples

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application example 1

[0143] figure 2 A schematic diagram showing a two-dimensional isotropic medium constant velocity model according to an embodiment of the present invention.

[0144] Step 1: Establish a two-dimensional isotropic medium constant velocity model, such as figure 2 As shown, the longitudinal wave velocity is 3000 m / s, the shear wave velocity is 2000 m / s, and the excitation source is the longitudinal wave source, which is located in the center of the velocity model. The Lake wavelet with a main frequency of 50 Hz is selected as our seismic wavelet, the spatial sampling interval is 1 meter, and the time sampling interval is 0.25 ms, and then the selected velocity model is grid discretized according to the selected spatial sampling.

[0145] Step 2: According to the formula (1), calculate the wave field value at each time of each grid point inside the velocity model, and obtain the internal wave field data.

[0146] Step 3: Calculate the wave field values ​​of the corner points of ...

application example 2

[0152] Figure 5 A schematic diagram showing a double-layer medium velocity model according to an embodiment of the present invention.

[0153] Step 1: Establish a two-dimensional isotropic layered medium velocity model, such as Figure 5 shown, the first layer of medium has a longitudinal wave velocity of 2000 m / s and a shear wave velocity of 1000 m / s, the second layer of medium has a longitudinal wave velocity of 4000 m / s and a shear wave velocity of 2000 m / s, and the excitation source is located at the top of the model 300 meters below, 300 meters from the left and right sides. The rake wavelet with the main frequency of 50Hz is selected as our seismic wavelet, the spatial sampling interval is 1 meter, and the time sampling interval is 0.25ms, and then the grid discretization is performed on the selected velocity model according to the selected spatial sampling.

[0154] Step 2: Calculate the wave field value at each moment of each grid point in the velocity model according...

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Abstract

The invention discloses a numerical value simulation method and system of an elastic wave field. The method can comprise the steps of 1, building a speed model, determining sampling intervals of spaceand time, and performing finite differential mesh discretization; 2, calculating internal wave field data according to an elastic fluctuation equation; 3, calculating angle point wave field data according to an angle point wave field numerical value calculation formula; 4, calculating boundary wave field data according to a wave field absorption boundary equation and a wave field absorption coefficient; 5, acquiring wave field data of the speed model, judging whether a reflection condition of the wave field boundary conforms to a preset standard or not, if yes, executing the step 6, if not, determining a wave field absorption coefficient again, and repeating steps 4 and 5; and 6, outputting final wave field data. The propagation authenticity of an elastic wave in a two-dimensional isotropic medium can be accurately reflected by a model wave field value, and the purpose of improving elastic wave numerical value simulation result accuracy is improved.

Description

technical field [0001] The present invention relates to the technical field of elastic wave field numerical simulation, and more specifically, to a method and system for elastic wave field numerical simulation. Background technique [0002] The elastic wave field numerical simulation technology is an important technology in seismic exploration. Using the forward modeling technology in the elastic wave field numerical simulation technology, the underground physical parameters obtained through seismic data processing and geological interpretation and the inversion velocity model can be tested. Whether it can truly reflect the underground oil storage structure, if we leave the elastic wave field numerical simulation technology, our current processing and interpretation of many seismic data will be difficult. At present, the elastic wave field numerical simulation widely used in practical work The technology is mainly the elastic wave field finite difference wave field numerical...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/30
Inventor 李文杰刘来详陈世军
Owner CHINA PETROLEUM & CHEM CORP
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