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Compensating the j-transformed complex time-spectrum method to improve the resolution of seismic sections

A technology of seismic section and resolution, applied in the direction of seismic signal processing, etc., to achieve the effect of less user operations, clear principle, fidelity and stability

Active Publication Date: 2017-07-04
西安石文软件有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inverse Q filtering can compensate the signal in terms of frequency, amplitude, phase, etc. Its shortcoming needs to know the accuracy Q value

Method used

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  • Compensating the j-transformed complex time-spectrum method to improve the resolution of seismic sections
  • Compensating the j-transformed complex time-spectrum method to improve the resolution of seismic sections
  • Compensating the j-transformed complex time-spectrum method to improve the resolution of seismic sections

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Embodiment Construction

[0058] The present invention will now be further described in conjunction with the embodiments and drawings:

[0059] The present invention provides the following technical solutions to compensate for the energy attenuation of the seismic signal by compensating the J-transform complex time-spectrum of the seismic signal, thereby achieving the purpose of improving the seismic resolution. The method improves the Gabor wavelet, and constructs its inverse transform based on the improved Gabor wavelet. Since this inverse transform is different from the traditional wavelet inverse transform, it is a new transform, which is called J transform in the present invention. The implementation scheme is as follows:

[0060] 1) Gabor wavelet does not satisfy the wavelet admissible condition, therefore, there is no wavelet reconstruction formula. The Gabor wavelet function is

[0061]

[0062] The present invention modifies formula (6). Take η = 2π, and modify the amplitude parameter as σ is a ...

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Abstract

The invention relates to a method for enhancing resolution of a seismic section through compensating J transform complex time-frequency spectrum. Mean amplitude spectrum of the seismic section is analyzed, an attenuation frequency band requiring energy compensation is confirmed, and an amplitude spectrum attenuation function changing with frequency is obtained through fitting so that a time-frequency spectrum compensation factor and a compensation function are constructed on the basis of the attenuation function. Then the complex time-frequency spectrum is adjusted by the compensation function. Finally, a seismic signal is reconstructed through inverse J transform so that an objective of enhancing resolution of the seismic signal is realized. The method has fidelity and a great resolution enhancement function.

Description

Technical field [0001] The invention belongs to the field of geophysics and oil and gas seismic exploration and development, and relates to a method for improving the resolution of a vertical seismic profile by compensating the complex time-spectrum of the J transform of a seismic exploration signal. Background technique [0002] In oil and gas exploration, the fine description of oil reservoirs and geological structures requires high-resolution seismic data. However, due to the viscous nature of the earth's stratigraphic medium, the seismic waves are subjected to earth absorption and dispersion when propagating underground, which relatively reduces the energy of the high frequency part of the seismic waves, resulting in a reduction in the resolution of seismic signals. [0003] Researchers have proposed various methods to improve the resolution of exploration seismic signals. In the early days, based on the simple convolution model, assuming that the seismic data is a stationary ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 姬战怀严胜刚张莲叶
Owner 西安石文软件有限公司