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3d VSP prestack imaging method based on organic fusion of optimal offset aperture and wavelet distortion free

A technique for migrating apertures, imaging methods, used in seismic signal processing and other directions

Inactive Publication Date: 2017-02-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology fundamentally solves several key problems in conventional Gaussian beam migration on the basis of a deep understanding of the mechanism of the beam migration method, so as to obtain a high-signal-to-noise ratio, high accuracy and no wavelet distortion. Migration method to better solve 3D VSP imaging problems

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] First, by solving the dynamic ray tracing ordinary differential equations, the 3D VSP reflected longitudinal wave field forward modeling model is established. Then, the algorithm of the present invention is used to perform migration imaging on the above-mentioned forward wave field, and the migration method is corrected by continuously comparing the migration results with the theoretical model. After the migration method obtains a higher accuracy, the method is used for The 3D VSP measured reflection longitudinal wave data of Well Shengliken-71 is migrated and imaged, and the complex geological structures in it can be accurately restored, with little migration noise, clear imaging and accurate homing, and the effect is significantly better than conventional methods.

[0018] The present invention organically integrates the optimal migration aperture and wavelet distortion-free in the three links of beam migration, and improves the traditional beam migration algorithm, th...

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Abstract

The invention provides a 3D VSP (three-dimensional video signal processor) pre-stack imaging technology organically integrating the optimization of migration aperture with the avoidance of wavelet distortion. The method comprises the following three links of: (1) decomposing data; (2) migrating; and (3) rebuilding. The method organically integrates the optimization of the migration aperture and the whole prolongation of the wavelet into three links of the beam deviation to simultaneously solve the problems such as the wavelet distortion and the migration aperture instead of purely considering the optimization of the migration aperture or solving the problem of the wavelet distortion, so that the organic integration between the optimization of migration aperture and the avoidance of the wavelet distortion can be realized in the three links of the beam deviation. The 3D VSP theoretical wave field and measured data process result shows that the 3D VSP well periphery accurate imaging can be realized by the technology.

Description

technical field [0001] The invention relates to a 3D VSP pre-stack imaging technology which organically combines optimal offset aperture and wavelet distortion free. The invention belongs to a processing method for 3D VSP seismic signals, and relates to a 3D VSP wave field atomic decomposition technology, an atomic directional extension technology and a wave field selective reconstruction technology. Background technique [0002] As a borehole seismic observation technology, vertical seismic profiling (VSP) has the advantages of high signal-to-noise ratio, high resolution, rich wave field information, and is conducive to underground imaging and seismic attribute analysis compared with surface seismic. 3D VSP is a three-dimensional borehole seismic observation technology developed in order to overcome the limitation of a certain angle in the coverage area of ​​two-dimensional VSP. The 3D VSP data has high resolution, and can image small structures that cannot be imaged by su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 王珺
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)