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Seismic data low-frequency enhancement method for improving deep carbonate reservoir depiction precision

A carbonate rock reservoir and seismic data technology, applied in the field of petroleum seismic exploration, can solve the problems of difficult to obtain processing effect, cumbersome process of adjusting parameters, etc.

Active Publication Date: 2020-04-10
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

At present, some conventional methods for enhancing low-frequency information usually construct compensation operators (also known as frequency expansion operators) based on existing seismic data, which involves many control parameters, making this type of method suitable for practical data processing. When , the process of adjusting parameters is very cumbersome, and it is difficult to obtain the best processing effect

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  • Seismic data low-frequency enhancement method for improving deep carbonate reservoir depiction precision
  • Seismic data low-frequency enhancement method for improving deep carbonate reservoir depiction precision
  • Seismic data low-frequency enhancement method for improving deep carbonate reservoir depiction precision

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Embodiment Construction

[0029] (1) Input the seismic data set. In this embodiment, the statistical information of the seismic data is first used to invert the seismic wavelet, and then the optimal sparse regularization method is used to invert the reflection coefficient;

[0030] (2) Construct the seismic wavelet w with rich low-frequency information according to the following steps b :

[0031] ①Based on the seismic wavelet inverted in step ⑴, calculate the average seismic wavelet w of the input seismic data set a ;

[0032] ② For the average seismic wavelet w a Do N-point Fourier transform, and obtain its normalized amplitude spectrum S a , N is the number of sampling points included in the seismic trace, and N=1750 in this embodiment;

[0033] ③Determine the reference position n=N / 2, and give the control parameter P a = 0.07 and P b = 1.5;

[0034] ④ Calculate the new amplitude spectrum S according to the following formula b :

[0035]

[0036] In the formula, j is the sampling point n...

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Abstract

The invention provides a seismic data low-frequency enhancement method for improving deep carbonate reservoir depiction precision. The method includes: firstly, utilizing an input seismic data set forinversion of corresponding seismic wavelets, reflection coefficients and average seismic wavelets, then constructing seismic wavelets rich in low-frequency information, and finally convolving the seismic wavelets rich in low-frequency information and the reflection coefficients to obtain low-frequency energy enhanced seismic data rich in low-frequency information. Transverse and longitudinal changes of the seismic data in a work area are considered, processing parameters can be rapidly determined according to the actual situation of the work area, an optimal processing effect can be obtained,and the depiction quality of fault and fracture systems and other geological anomalies in the deep carbonate reservoir can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of petroleum seismic exploration, and relates to a low-frequency enhancement method for seismic data that improves the depiction accuracy of deep carbonate rock reservoirs. After the method of the patent is processed, the imaging accuracy of various effective geological features in deep carbonate reservoirs can be significantly improved. Background technique [0002] At present, the seismic data collected by conventional seismic sources and receivers often lack low-frequency components due to the limitations of the hardware functions of the seismic sources and receivers. Especially in many areas of my country, due to the deep burial of carbonate reservoirs, complex geological structure and spatial distribution, and strong internal structure heterogeneity and anisotropy, the absorption and attenuation of seismic exploration signals is very difficult. Seriously, the amplitude of seismic reflection signals of deep carbon...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
CPCG01V1/28G01V1/36G01V1/282G01V2210/23
Inventor 陈学华张杰徐赫蒋伟罗鑫
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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