Method and device for eliminating elastic reverse time migration crosstalk interference and computer storage medium

A technology of reverse time migration and crosstalk interference, which is applied in the field of exploration geophysical data processing and parameter inversion, and can solve problems such as high economic cost, invalid superposition, and image quality degradation

Active Publication Date: 2020-09-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the divergence and curl change the phase and amplitude of the original wavefield, resulting in inaccurate imaging results; more importantly, the polarity inversion problem in multi-component S images, without proper correction, will lead to invalid superposition and image quality degradation
The traditional wave field separation technology also needs to store a large number of wave field snapshots, and the economic cost is relatively high

Method used

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  • Method and device for eliminating elastic reverse time migration crosstalk interference and computer storage medium
  • Method and device for eliminating elastic reverse time migration crosstalk interference and computer storage medium
  • Method and device for eliminating elastic reverse time migration crosstalk interference and computer storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] This example uses a pulse test and a theoretical model (two-layer model) to compare the imaging results of traditional and improved ERTM in practical applications. First, the migration impulse responses for a set of PP and PS are calculated. Upper layer speed V P =2000m / s, V S =1070m / s, density ρ=20.7g / cm 3 ;Lower velocity V P =3000m / s, V S =1600m / s, density ρ=2.29g / cm 3 . A single point scattering is placed at the position of the two-layer model (3800m, 3500m), the Rayleigh wave source with a center frequency of 12Hz is placed at (4000m, 0m), and the receiver position is offset by 400m relative to the source. Using the staggered grid finite difference method (Virieux J.P-SV wave propagation in heterogeneous media: Velocity-stressfinite-difference method. Geophysics, 1986, 51(4): 889–901.) to solve the velocity-stress elastic wave equation, simulated a A multi-component record of the receiver's position. For better quality, the events of the diffracted P and S w...

Embodiment 2

[0097] This example uses a pulse test and the right part of the theoretical model (BP 2004 model) to compare the imaging results of traditional and improved ERTM in practical applications. First, the migration impulse responses for a set of PP and PS are calculated. Upper layer speed V P =2000m / s, V S =1070m / s, density ρ=20.7g / cm 3 ;Lower velocity V P =3000m / s, V S =1600m / s, density ρ=2.29g / cm 3 . Experiments with the BP 2004 model used 400 surface explosives and 900 equidistant bottom bottom nodes (OBNs). Figure 5 The imaging results of PP and PS are shown, and the backscatter noise of traditional ERTM is removed by high-pass filter, which ensures that the comparison can be made under the same bandwidth. When using this smoothed migration velocity, strong velocity gradients at the top of the salt dome introduce erroneous images ( Figure 5 arrows in a and 5c). In contrast, the image obtained by the improved method is more consistent with the actual formation after r...

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Abstract

The invention relates to a method for eliminating elastic reverse time migration crosstalk interference. The method comprises the following steps: a, establishing a geophysical medium model; b, givinga source wavelet, and receiving a multi-component record in the geophysical medium model by using a detector; c, filtering the source wavelet and the multi-component record by using a filter, constructing a seismic source wave field based on the filtered source wavelet, and performing calculating to obtain a separated source wave field; d, constructing a receiver wave field and an additional receiver wave field based on the filtered multi-component record; e, performing Hilbert transform based on the separated source wave field, receiver wave field and extra receiver wave field, applying imaging conditions, and summing all components to obtain PP, PS, SP and SS images. According to the method, the economic cost is effectively reduced, and a large amount of storage space required by wave field snapshots in a traditional wave field separation technology is avoided.

Description

technical field [0001] The invention relates to a method, a device and a computer storage medium for eliminating crosstalk interference of elastic reverse time migration, and belongs to the fields of exploration geophysical data processing and parameter inversion. Background technique [0002] Early elastography was performed in the framework of Kirchhoff migration, a method that projects P- and S-wave reflections into the subsurface along traveltime trajectories. However, due to the difficulty of considering multi-channel arrival in ray theory, it is difficult to calculate the amplitude of the caustic region, so the elastic Kirchhoff migration is inaccurate, and it cannot even solve the complex structure imaging problem caused by multi-channel and caustic phenomena. In recent years, divergence and curl operators are no longer used, but the vector wave field decomposition method based on the decoupled P-wave and S-wave equations has been studied in depth, so that the generat...

Claims

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Application Information

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IPC IPC(8): G01V1/36G01V1/28
CPCG01V1/282G01V1/36
Inventor 郝新源赵杨左佳卉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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