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Method and device for constructing elastic migration seismic wave field

A technology of seismic wave field and construction method, applied in the field of exploration geophysics

Active Publication Date: 2016-02-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, the conventional compact staggered grid finite difference technique has not been used for elastic reverse time migration; and when the order of difference is the same, the existing conventional compact staggered grid One or two less on both sides of the lattice finite difference

Method used

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  • Method and device for constructing elastic migration seismic wave field
  • Method and device for constructing elastic migration seismic wave field
  • Method and device for constructing elastic migration seismic wave field

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Embodiment 1

[0110] The invention provides a method for constructing an elastic migration seismic wave field, such as figure 1 As shown, the method specifically includes:

[0111] Step S11, according to the elastic wave velocity stress equation, obtain the finite difference coefficient of the extended compact interlaced grid;

[0112] Step S12, calculating the extended compact staggered grid finite difference operator matrix;

[0113] Step S13, constructing a source wave field forward extrapolation operator and a receiver wave field reverse time extrapolation operator;

[0114] Step S14, according to the forward extrapolation operator of the source wave field, the preset medium model and the source function, realize the forward extrapolation of the seismic wave field, and obtain the source wave field;

[0115] Step S15, according to the reverse time extrapolation operator of the detection wave field, the preset medium model and the preset multi-component seismic data, realize the reverse...

Embodiment 2

[0158] This embodiment describes the specific process of the elastic migration seismic wavefield construction method provided in Embodiment 1. The method flow of this embodiment is as follows figure 2 Shown:

[0159] Process 1. Extended compact staggered grid differential discretization of the elastic wave velocity-stress equation

[0160] In the elastic migration seismic wave field construction method provided in Embodiment 1, the elastic wave velocity stress equation used is:

[0161] ∂ v x ∂ t = 1 ρ ( ∂ ...

Embodiment 3

[0221] This embodiment provides a specific embodiment of applying the elastic migration seismic wave field construction method, which specifically uses the elastic migration seismic wave field construction method provided in Embodiment 1 to perform elastic reverse time migration imaging on a preset medium model.

[0222] The pre-set medium model P-wave velocity field such as image 3 shown. image 3 In , the horizontal coordinate is the spatial geographic location, the vertical coordinate is the depth position, and the color depth of different points in the coordinate system represents the longitudinal wave velocity at that point. image 3 The medium scale marks the different longitudinal wave velocities represented by different color depths, the shear wave velocity is 0.588 times the corresponding longitudinal wave velocity, and the density is constant ρ=1000kg / m 3 , the horizontal width is 17km, the vertical depth is 3.5km, the horizontal and vertical spatial sampling inter...

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Abstract

The invention provides an elastic migration seismic wave field construction method and an elastic migration seismic wave field construction device. The method includes computing a finite difference coefficient of extended compact staggered grids according to an elastic wave velocity stress equation; computing a finite difference operator matrix of the extended compact staggered grids; constructing forward direction extrapolation operator of a seismic source wave field, and a reverse-time extrapolation operator of a detection wave field; achieving forward direction extrapolation of a seismic wave field to obtain the seismic source wave field according to the forward direction extrapolation operator of the seismic source wave field, a preset medium model and a preset seismic source function; and achieving reverse-time extrapolation of the seismic wave field to obtain the detection wave field according to the reverse-time extrapolation operator of the detection wave field, a preset medium model and preset multi-component seismic data. Compared with an existing method for constructing an elastic deflection seismic wave field by utilization of a conventional finite difference method and a compact difference method, the number of difference base frame grid points is reduced under the condition of same difference orders, the construction precision of a complex medium wave field can be effectively improved, and therefore the imaging precision of reverse-time migration is improved.

Description

technical field [0001] The invention relates to the field of exploration geophysics, in particular to a method and device for constructing an elastic migration seismic wave field. Background technique [0002] In the construction of the elastic migration seismic wave field, the source wave field and the receiver wave field need to be constructed. The source wave field is generally obtained by time-forward extrapolation of the elastic wave velocity-stress equation, and the receiver wave field is generally obtained by the elastic wave velocity-stress equation. Obtained by reverse time extrapolation. [0003] At present, the commonly used numerical method for the extrapolation of the elastic wave velocity-stress equation is based on the staggered grid finite difference method. The advantage of this method is that it can accurately describe complex media through grid division, fast calculation speed, and low memory requirements. But the problem is that in order to obtain higher...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 杜启振公绪飞
Owner BC P INC CHINA NAT PETROLEUM CORP
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