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Method for extracting pre-stack correction trace gathering seismic wavelets

A technology of pre-stack gathers and seismic wavelets, applied in the field of seismic exploration, can solve the problems of poor anti-noise ability and low precision of seismic wavelets, and achieve the effect of improving accuracy, anti-noise ability and reliability.

Active Publication Date: 2015-10-21
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for extracting seismic wavelets of prestack correction gathers to overcome the problems of low precision of seismic wavelets and poor anti-noise ability in the prior art

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  • Method for extracting pre-stack correction trace gathering seismic wavelets
  • Method for extracting pre-stack correction trace gathering seismic wavelets
  • Method for extracting pre-stack correction trace gathering seismic wavelets

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Embodiment Construction

[0022] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0023] figure 1 A flowchart showing a method for extracting a prestack correction gather seismic wavelet according to an exemplary embodiment of the present invention. Here, as an example, the method may be implemented by a device for extracting seismic wavelets of a pre-stack correction gather, and may also be implemented entirely by a computer program.

[0024] Such as figure 1 As shown, in step S100, the acquired seismic records and well logging data are preprocessed respectively to obtain seismic prestack gather data and well logging gather data.

[0025] Here, the preprocessing adopts conventional methods in this field, such as processing the origin...

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Abstract

The invention relates to a method for extracting pre-stack correction trace gathering seismic wavelets. The method includes the following steps that: (A) seismic pre-stack trace gathering data and logging trace gathering data are acquired; (B) seismic pre-stack trace gathering data to be corrected and logging trace gathering data to be processed are acquired; (C) the phase correction angle of each channel of seismic pre-stack trace gathering data to be corrected is determined; (D) phase correction is performed on corresponding channels of seismic pre-stack trace gathering data to be corrected respectively, so that seismic pre-stack trace gathering data to be processed can be obtained; (E) preset matched filtering operators of the seismic pre-stack trace gathering data to be processed are utilized to determine final matched filtering operators; (F) matched trace gathering data of the seismic pre-stack trace gathering data to be processed and the logging trace gathering data to be processed are obtained; and (G) the seismic wavelet spectrum of the seismic pre-stack trace gathering data is determined, and the seismic wavelet spectrum is utilized to obtain optimal seismic wavelets. With the method adopted, the accuracy and the anti-noise capability of seismic wavelets can be improved, and a beneficial foundation can be laid for subsequent deconvolution and inversion processing.

Description

technical field [0001] The present invention relates generally to the field of seismic exploration. More specifically, it relates to a method for extracting seismic wavelets from prestack correction gathers. Background technique [0002] Seismic exploration technology is gradually developing towards high precision and high resolution. Extracting accurate seismic wavelets is the basis of seismic signal deconvolution and wave impedance inversion. Therefore, how to extract accurate seismic wavelets has become a hot research issue. [0003] At present, most methods for extracting seismic wavelets are based on the autocorrelation function method or statistical autocorrelation method. However, the autocorrelation function method needs to put forward the assumption of the minimum phase seismic wavelet, and this method is blind to the phase and cannot extract the seismic wavelet. Therefore, the processing results obtained under this assumption are unreliable; in addition, the stati...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 张华李亚林何光明陈爱萍罗红明曹立斌
Owner BC P INC CHINA NAT PETROLEUM CORP
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