Pre-stack seismic data frequency band expanding method of combining well information and horizon information

A pre-stack seismic and seismic data technology, applied in the field of pre-stack seismic data frequency band expansion, can solve the problems of low resolution and cumbersome processing methods

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have problems such as low resolution and cumbersome processing methods to varying degrees.

Method used

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  • Pre-stack seismic data frequency band expanding method of combining well information and horizon information
  • Pre-stack seismic data frequency band expanding method of combining well information and horizon information
  • Pre-stack seismic data frequency band expanding method of combining well information and horizon information

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Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1, a method for expanding frequency bands of pre-stack seismic data combining well data and horizon data includes:

[0042] Step 1: Analyze the frequency band range of seismic data, signal-to-noise ratio spectrum analysis, signal purity spectrum and frequency division profile, and divide the data frequency band range.

[0043] Step 2, the method of constructing the expected seismic trace next to the well. This method selects the broadband wavelet, and uses the convolution theory or finite difference forward modeling to combine the logging data (logging wave impedance, logging density curve) with the pre-stack time migration The wellside seismic traces are matched to construct high-resolution expected seismic traces.

[0044] Step 3. The high-frequency seismic data (the frequency band range is related to the conditions of the work area and the depth of the horizon) are obtained through the sparse reflection coefficient profile construction method. This method ...

Embodiment 2

[0048] Embodiment 2, a method for expanding frequency bands of pre-stack seismic data combining well data and horizon data, comprising the following steps:

[0049] Step 1: Analyze the signal-to-noise ratio spectrum and frequency spectrum of the seismic data, and divide the frequency band range;

[0050] Step 2: Construct high-resolution desired seismic traces;

[0051] Step 3: Obtain high-frequency seismic data;

[0052] Step 4: Obtain low-frequency seismic data;

[0053] Step 5: Fusion of high-frequency and low-frequency data, reconstruction to obtain broadband seismic data;

[0054] Step 6: Calculate the frequency extension operator, and perform frequency extension processing under the constraint of SNR spectrum to obtain broadband pre-stack seismic data.

[0055] further:

[0056] In step 1, the signal-to-noise ratio spectrum of seismic data is obtained by using the cross-correlation between seismic traces and the autocorrelation of each seismic trace, and the frequenc...

Embodiment 3

[0062] Example 3, such as figure 1 As shown, a pre-stack seismic data frequency band expansion method combining well data and horizon data includes the following steps:

[0063] In step 1, the data analysis of the work area is carried out, including the frequency band range of the seismic data in the work area, the signal-to-noise ratio spectrum analysis, the purity spectrum of the signal, and the frequency division profile, and the frequency bands of the work area data are divided into low frequency bands, transition frequency bands, dominant frequency bands, and transition frequency bands. The frequency band and the high frequency area to be improved.

[0064] In step 2, singular values ​​are removed from the analysis of the acoustic wave and density log curves, so as to eliminate the influence of the corrected borehole diameter. In the logging data, the compressional wave velocity curve and density curve in the data are mainly used, and the time-depth relationship curve de...

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Abstract

The invention provides a pre-stack seismic data frequency band expanding method of combining well information and horizon information. The pre-stack seismic data frequency band expanding method comprises steps that signal-to-noise ratio spectrum analysis, spectral analysis, and band division scanning of seismic data are carried out to determine a dominant frequency band and to-be-compensated frequency bands; correction and well-seismic matching of well logging data are carried out to construct a well-side expected seismic record; by using a well point reflection coefficient, a well-side seismic record, and a horizon interpretation data, a sparse reflection coefficient section is constructed, and then expected seismic records of non-well points are acquired; by adopting an original seismic record and a reversed wavelet convolution, the expected seismic record is approached, and a corresponding bilateral reversed wavelet is acquired; a frequency-expanding operator acquired by a stacked record is used for a CRP trace gather, and the frequency-expanding operator is used to process every data of the CRP trace gather to acquire the high frequency frequency-expanding record and the low frequency frequency-expanding record of the CRP trace gather; the data reconstruction of the low frequency data acquired by the frequency expansion, the original dominant frequency band, and the high frequency data acquired by the frequency expansion is carried out to acquire wide frequency band seismic data.

Description

technical field [0001] The invention relates to the technical field of seismic data processing, in particular to a pre-stack seismic data frequency band expansion method for improving resolution by combining well data and horizon data. Background technique [0002] At present, the commonly used processing methods for improving the resolution of seismic data include inverse Q filtering, generalized S transform, spectral simulation deconvolution and so on. Inverse Q filtering is the most common and effective method to improve the resolution of seismic data. At present, there are three main types of inverse-Q filtering methods at home and abroad: the inverse-Q filtering method using series expansion for approximate high-frequency compensation, the inverse-Q filtering method based on wave field continuation, and other inverse-Q filtering methods. Inverse Q filtering requires the quality factor Q value of the formation, and its accuracy directly affects the accuracy of inverse Q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/32
CPCG01V1/28G01V1/32G01V2210/6169
Inventor 赵爱国尚新民韩站一唐杰刘立彬刁瑞李强
Owner CHINA PETROLEUM & CHEM CORP
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