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Pseudo-acoustic curve construction method based on nonsubsampled Contourlet transformation

A non-subsampled, pseudosonic wave technology, applied in the field of pseudosonic wave curve construction based on non-subsampled Contourlet transform

Active Publication Date: 2012-02-15
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, it only performs simple addition and subtraction operations on the basis of acoustic wave curves, and in most cases only uses a single well logging data curve for reconstruction

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  • Pseudo-acoustic curve construction method based on nonsubsampled Contourlet transformation
  • Pseudo-acoustic curve construction method based on nonsubsampled Contourlet transformation
  • Pseudo-acoustic curve construction method based on nonsubsampled Contourlet transformation

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Embodiment Construction

[0025] The method for constructing pseudoacoustic curves according to the present invention mainly includes: reading in ASCII format logging data, preprocessing of logging data, forward and reverse calculation of multi-level non-subsampling Contourlet transformation, display and comparison of pseudoacoustic curves, and the like. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0026] figure 1 A flow chart of a method for constructing a quasi-acoustic wave curve of non-subsampled Contourlet transform according to an embodiment of the present invention is shown.

[0027] First, at step 100, well logging data is read, and here, the well logging data in ASCII format is usually used.

[0028] Next, in step 110, the read logging data is preprocessed. In this embodiment, the preprocessing may include curve correction, standardization and normalization. Specifically, firstly, smoothing and filtering are performed on eac...

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Abstract

The invention provides a pseudo-acoustic curve construction method based on nonsubsampled Contourlet transformation. The method comprises the following steps: reading logging data; carrying out pretreatment on read logging data curves, wherein the pretreatment comprises curve correction, data standardization and normalization processing; carrying out multistage nonsubsampled Contourlet transformation on the logging data curves respectively, carrying out weight fusion according to a coupling degree between the logging data curves so as to generate a high frequency fusion curve and a low frequency fusion curve; carrying out nonsubsampled Contourlet inverse transformation on the high frequency fusion curve and the low frequency fusion curve so as to generate a pseudo-acoustic curve.

Description

technical field [0001] The present invention relates to seismic exploration data processing technology, more specifically, to a method for constructing pseudosonic curves based on non-subsampling Contourlet transform, which is used to construct high-precision pseudosonic curves to improve the accuracy of seismic horizon calibration and seismic inversion resolution. Background technique [0002] How to make full use of various logging data curves to improve the resolution and accuracy of seismic inversion has always been the direction of efforts in seismic research for oil and gas exploration and development. For a long time, acoustic logging data curves have been used in seismic inversion for seismic geological horizon calibration and wave impedance inversion. However, in many cases, due to wellbore pollution, reservoir cementation degree and porosity or other non-formation lithology factors, the high-frequency information in the acoustic logging data curve cannot represent...

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Application Information

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IPC IPC(8): G01V1/28G01V1/36G01V1/40
Inventor 张洞君邹文陶正喜黄东山彭真明刘丽红陶韬
Owner BC P INC CHINA NAT PETROLEUM CORP
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