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Method for enhancing resolution of seismic section through compensating Morlet wavelet transform complex time-frequency spectrum

A technology of seismic section and wavelet transform, applied in seismic signal processing and other directions

Active Publication Date: 2015-09-23
NORTHWESTERN POLYTECHNICAL UNIV +2
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  • Abstract
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  • Application Information

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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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  • Method for enhancing resolution of seismic section through compensating Morlet wavelet transform complex time-frequency spectrum
  • Method for enhancing resolution of seismic section through compensating Morlet wavelet transform complex time-frequency spectrum
  • Method for enhancing resolution of seismic section through compensating Morlet wavelet transform complex time-frequency spectrum

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Embodiment Construction

[0058] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0059] The present invention provides the following technical proposals. By compensating the Morlet wavelet transform complex time-spectrum of seismic signals, the energy attenuation of seismic signals is compensated, thereby achieving the purpose of improving seismic resolution. The method improves the Morlet wavelet, and constructs its inverse transform based on the improved Morlet wavelet. The implementation plan is as follows:

[0060] 1) Morlet wavelet does not satisfy the wavelet admissible condition, therefore, there is no wavelet reconstruction formula. Morlet wavelet is a special case of Gabor wavelet, the Gabor wavelet function is

[0061] ψ ( t ) = 1 ( σ 2 π ...

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Abstract

The invention relates to a method for enhancing resolution of a seismic section through compensating Morlet wavelet transform complex time-frequency spectrum, and aims at realizing seismic signal time-frequency decomposition and reconstruction. Morlet wavelet is improved by the method, based on which a Morlet wavelet inverse transform formula is constructed. The method comprises the steps that 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 Morlet wavelet inverse 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 fields of geophysics and oil-gas seismic exploration and development, and specifically relates to a method for improving the resolution of vertical seismic sections by compensating the complex time-spectrum of Morlet wavelet transform of seismic traces. Background technique [0002] In oil and gas exploration, high-resolution seismic data are required for fine description of reservoirs and geological structures. However, due to the viscosity of the earth formation medium, the seismic wave is absorbed and dispersed by the ground when it propagates underground, which relatively reduces the energy of the high frequency part of the seismic wave, resulting in a decrease in the resolution of the seismic signal. [0003] Researchers have proposed various methods for improving the resolution of seismic signals from surveys. In the early stage, based on the simple convolution model, assuming that the seismic data is a stationary si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 姬战怀严胜刚张莲叶
Owner NORTHWESTERN POLYTECHNICAL UNIV
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