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A Migration Velocity Analysis Method and Device Based on Sparse Inversion

A migration velocity analysis and sparse inversion technology, applied in the field of exploration seismic, can solve the problems of insufficient iteration, excessive iteration, time-consuming migration velocity analysis, poor stability of inversion results, etc., and achieves the release of manual labor and good application value. , the effect of shortening the speed modeling cycle

Active Publication Date: 2017-02-08
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Migration velocity analysis is therefore a time-consuming and labor-intensive process
[0003] In practical applications, most of the migration velocity analysis models are objective functions constructed by least squares, which often makes the inversion results poor in stability and multi-solution, and the solution process is usually numerically solved by the linear conjugate gradient method, and there are iterative Disadvantages of under- or over-iterating

Method used

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  • A Migration Velocity Analysis Method and Device Based on Sparse Inversion
  • A Migration Velocity Analysis Method and Device Based on Sparse Inversion
  • A Migration Velocity Analysis Method and Device Based on Sparse Inversion

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Embodiment

[0057] Through the two-dimensional model data, the application effect of a migration velocity analysis method based on sparse inversion is illustrated. Taking the VTI medium as an example, it contains two reflective interfaces. Total shot point observation, shot point interval 50 meters, track spacing 50 meters, number of tracks 40, time sampling interval 4 milliseconds, number of samples 1000, main frequency of Reker wavelet 30 Hz. To avoid boundary effects, the migration velocity analysis starts at a CMP of 2000 m. The prestack depth migration profile implemented using the initial model parameters is as follows: Figure 4 As shown, the migration result obtained after 10 iterations is as follows Figure 5 As shown, the velocity model is as Image 6 As shown, there is a significant improvement in the position of deep reflectors in the migration results. In order to clearly illustrate the change of the event in the common imaging point gather during the update process of th...

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Abstract

The invention discloses a sparse inversion based migration velocity analysis method. The sparse inversion based migration velocity analysis method comprises the steps of performing prestack depth migration according to seismic data and an initial velocity model to obtain a co-imaging point trace gather; picking up cophasal shaft residual depth in the co-imaging point trace gather and using the cophasal shaft residual depth as system input data; utilizing the residual depth and a velocity model to be calculated to establish a migration velocity analysis sparse inversion mode; utilizing a nonlinear iteration algorithm to solve a velocity mode; repeating execution till a shutdown rule is confirmed, and inversing a final migration velocity model. The invention further discloses a sparse inversion based migration velocity analysis device. By means of the technical scheme, the migration velocity model can be quickly inversed, multiple solutions can be decreased, and the sparse inversion based migration velocity analysis method and device have good application value on large-scale earthquake velocity modeling application.

Description

technical field [0001] The invention belongs to the field of exploration seismic technology, and relates to a migration velocity analysis method based on sparse inversion, and also relates to a migration velocity analysis device based on sparse inversion. Background technique [0002] The seismic prestack depth migration results are highly sensitive to the velocity model, which makes the velocity analysis method based on migration data a powerful tool for velocity modeling. In recent years, with the continuous improvement of the imaging accuracy of complex geological structures, the value of migration velocity analysis in the field of seismic exploration has become more and more important. From the perspective of inversion theory, migration velocity analysis is a nonlinear inversion problem, and elastic parameters are updated iteratively through two steps of prestack depth migration and velocity analysis. In each iteration of migration velocity analysis, it is necessary to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 于彩霞王彦飞
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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