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Method for improving seismic data resolution ratio

A seismic data, high-resolution technology, applied in seismic signal processing and other directions, can solve problems such as large stability constants and reduced seismic data compensation effects

Active Publication Date: 2013-11-27
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
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Problems solved by technology

For seismic data without noise, the stable inverse Q filtering method can restore the frequency components that can be recovered in principle; however, for seismic data with noise, in order not to amplify the environmental noise when applying this method, it is necessary to use a large stability constant, while This practice will reduce the compensation effect on seismic data

Method used

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  • Method for improving seismic data resolution ratio
  • Method for improving seismic data resolution ratio

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Embodiment 1

[0086] Such as image 3 As shown, among the results obtained by filtering the theoretical noisy seismic data using the method of combining the time-varying bandpass filter and the stable inverse Q filter used in the present invention, figure (a) is the synthetic seismic data containing noise ( Its signal-to-noise ratio is 10). Figure (b) is the result of filtering the noisy synthetic seismic data in Figure (a) by using the stable inverse Q filter method. Figure (c) is the result of using time-varying band-pass filter and stabilized The combined method of inverse Q filtering is the result of filtering the synthetic seismic data with noise in Figure (a). where the stability constant σ 2 Both are set to 0.01. The first seismic data in Figures (a) to (c) are used as reference data, all of which are seismic data without attenuation. Depend on image 3 It can be seen that the combination of time-varying band-pass filter and stable inverse Q filter can improve the resolution of s...

Embodiment 2

[0088] Such as Figure 4 As shown, the method of combining the time-varying bandpass filter and the stable inverse Q filter used in the present invention is used to filter the actual noisy seismic data. Among the results obtained, Figure (a) is a land earthquake with environmental noise Post-stack profile, Figure (b) is the result of filtering the land seismic section data in Figure (a) with environmental noise by using the stable inverse Q filter method, Figure (c) is the result of using the time-varying band-pass filter and the stable The combined method of inverse Q filtering is the result of filtering processing on land seismic section data with environmental noise in Figure (a). The Q values ​​used in Figures (b) to (c) are all 110, and the stability constant σ 2 Both are set to 0.005. Comparing the sections in the elliptical area of ​​Figures (a) to (c), it can be seen that the resolution of seismic data processed by the stable inverse Q filter method has been signific...

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Abstract

The invention relates to a method for improving the seismic data resolution ratio. The method for improving the seismic data resolution ratio comprises the following steps that a time domain signal u (t) of an actual attenuating seismic trace is established according to input seismic data; a series of Gabor plates u (tau, t) are established according to the established time domain signal u (t) of the actual attenuating seismic trace; FFT conversion is conducted on the Gabor plates u (tau, t) at all time points tau, so that a Gabor spectrum is generated, and the stable reverse Q filtering method compared with a time varying band-pass filter F (tau, omega) is applied to the Gabor spectrum, so that a Gabor spectrum U (tau, omega) after stable reverse Q filtering is generated; Fourier inverse transformation is conducted on the Gabor spectrum U (tau, omega) after stable reverse Q filtering in the depth position time tau direction and each obtained Gabor plate u (tau, t) is reconstituted; the seismic data with the high resolution ratio processed through the stable reverse Q filtering method compared with the time varying band-pass filter. The method for improving the seismic data resolution ratio can be widely applied to processing the seismic data.

Description

technical field [0001] The invention relates to a seismic data processing method, in particular to a method for improving seismic data resolution by combining a time-varying band-pass filter and a stable inverse Q filter. Background technique [0002] High-resolution seismic data is a prerequisite for reservoir description. Fine reservoir description, judgment of spatial heterogeneity, and monitoring of reservoir fluid changes during oil and gas field development all require high-resolution seismic data as the basis. Energy compensation for seismic wave attenuation is a cost-effective method to obtain high-quality seismic data without changing the original acquisition method. [0003] The internal friction and heterogeneity of the underground medium cause high-frequency energy dissipation and velocity dispersion effects, manifested as amplitude attenuation and waveform distortion. The seismic data after amplitude attenuation compensation can provide reliable relative amplit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 赵伟陈小宏陈增保郝振江李景叶翁斌王小六糜芳张云鹏彭利丽刘永江薛东川杨俊孙文博
Owner CHINA NAT OFFSHORE OIL CORP
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