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

A technology of reverse time migration and crosstalk interference, which is applied in the fields of exploration geophysical data processing and parameter inversion, can solve the problems of high economic cost, inaccurate imaging results, and degraded imaging quality, so as to improve computing efficiency and reduce a large number of The effect of TRON snapshot storage space and cost reduction

Active Publication Date: 2021-11-09
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Description
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  • Application Information

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

Examples

Experimental program
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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 crosstalk interference of elastic reverse time migration, which comprises the following steps: a. establishing a geophysical medium model; The filter filters the source wavelet and multi-component records, constructs the source wave field based on the filtered source wavelet, and calculates the separated source wave field; d constructs the receiver wave field and additional receivers based on the filtered multi-component records wavefield; e Based on the separated source, receiver, and additional receiver wavefields, Hilbert transform is applied, imaging conditions are applied, and all components are summed to obtain PP, PS, SP, and SS image. The method of the invention not only effectively reduces the economic cost, but also avoids a large amount of storage space required by the wave field snapshot in the traditional wave field separation technology.

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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Patent Type & Authority Patents(China)
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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