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Complex number field least square constraint spectrum bluing frequency expanding method

A technology of least squares and complex number domain, applied in the field of least squares constrained spectral bluening in the complex number domain, can solve the problems of not obvious frequency expansion effect and inflexible frequency expansion process, and achieve obvious frequency expansion effect and practicability strong effect

Active Publication Date: 2021-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) The effect of frequency extension is not obvious;
[0006] (2). Often only the high frequency part can be expanded;
[0007] (3). The frequency extension process is not flexible enough

Method used

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  • Complex number field least square constraint spectrum bluing frequency expanding method
  • Complex number field least square constraint spectrum bluing frequency expanding method
  • Complex number field least square constraint spectrum bluing frequency expanding method

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Experimental program
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Embodiment

[0065] Such as figure 1 As shown, the complex number domain least squares constrained spectrum bluing method (Y-SpecB) of the present invention comprises the following steps:

[0066] Step 1: Input Seismic Data

[0067] You can input pre-stack gather data or post-stack data volume. Generally speaking, in order to improve the calculation efficiency of Y-SpecB frequency extension processing, you can first input a piece of seismic data, and then set parameters to observe the frequency extension effect. If the effect If the requirements are met, then input the 3D seismic data volume for 3D Y-SpecB frequency extension processing.

[0068] Step 2: Design Broadband Target Spectrum

[0069] Design the broadband target spectrum through the wave impedance curves of one or several wells, filter the wave impedance curves, filter out the parts with too low or too high frequencies in the wave impedance curves, and then perform Fourier analysis on the wave impedance curves leaf transformati...

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Abstract

The invention belongs to the field of seismic data processing, and particularly relates to a complex number field least square constraint spectrum bluing frequency expanding method. The method comprises the following steps: establishing a frequency-broadening objective function based on a complex number field least square method, solving the objective function, obtaining a spectrum bluing frequency-broadening operator, multiplying the spectrum bluing frequency-broadening operator by an original seismic spectrum, and carrying out Fourier inversion to realize frequency-broadening processing of seismic data. The method can effectively compensate lost low-frequency information and enhance attenuated high-frequency information under the condition of not changing the seismic data phase spectrum, and can adjust the distance between the frequency spectrum of the seismic data after frequency expansion and the broadband target spectrum by setting different constraint parameters so as to obtain frequency expansion results of different main frequencies and bandwidths.

Description

technical field [0001] The invention belongs to the field of seismic data processing, and in particular relates to a complex number domain least square constrained spectrum blueing frequency extension method. Background technique [0002] Seismic frequency extension has always been a hot and difficult point in seismic data processing. Seismic frequency extension technology can be roughly divided into two categories, one is time domain frequency extension, which mainly includes deconvolution (Porsani et al., 1998; Yang Peijie et al., 2007), Inverse Q filtering (Wu Jizhong et al., 2016), blind source separation (Mu Xing, 2012), compressed sensing (Song Weiqi et al., 2017), etc. Deconvolution improves time resolution by compressing seismic wavelets. Since Robinson proposed predictive deconvolution in 1954, many effective deconvolution methods have emerged; inverse Q filtering compensates for formation viscoelastic attenuation, thereby improving The resolution of seismic data; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/307G01V2210/63
Inventor 杨培杰王长江罗红梅张景涛颜世翠邵卓娜张志敬李敏韦欣法徐仁
Owner CHINA PETROLEUM & CHEM CORP
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