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A Correction Method for Eliminating Residual Wavelet Phase of Seismic Data

A technology of seismic data and correction method, applied in the fields of mining, development, and oilfield exploration, can solve the problems of limiting the practical application of pure phase correction method, time-consuming estimation of phase correction factor, and low calculation efficiency.

Active Publication Date: 2015-09-23
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Estimating the phase correction factor by sweeping method is very time-consuming and computationally inefficient
Therefore, the conventional pure phase correction factor estimation method limits the practical application of the pure phase correction method

Method used

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  • A Correction Method for Eliminating Residual Wavelet Phase of Seismic Data
  • A Correction Method for Eliminating Residual Wavelet Phase of Seismic Data
  • A Correction Method for Eliminating Residual Wavelet Phase of Seismic Data

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Embodiment Construction

[0093] A correction method for eliminating residual wavelet phase of seismic data in the present invention is to eliminate the influence of residual wavelet phase by estimating residual wavelet phase information and performing phase correction processing on seismic data records, so that the remaining wavelet phase reaches or Close to zero phase to effectively improve seismic data resolution.

[0094] The pure phase part of the fast pure phase correction factor estimation and processing of the present invention is the part where the phase of the wavelet changes slowly with the frequency, and the pure phase correction factor is used to approximate the part with the slow change of the phase with the frequency, so as to estimate the pure phase correction factor and eliminate the phase change of the remaining wavelet bit impact.

[0095] The present invention comprises the following steps:

[0096] (1) Use artificial seismic sources to excite and collect seismic data, label the se...

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Abstract

The invention discloses a correction method for eliminating seismic data remaining wavelet phase. Pure phase correction factor is used for approaching a part of phase which is changed slowly with frequency, the pure phase correction factor is estimated, effects of the remaining wavelet phase are eliminated, phase correction process is carried out on seismic data record, the effects on the remaining wavelet phase are eliminated to enable the remaining wavelet phase to reach or approach zero phase so as to effectively improve seismic data resolution ratio. According to the correction method, only the phase of the seismic data remaining wavelet is processed, the amplitude spectrum of the data is not changed. Optimum phase correction factor a can be directly calculated and determined. The correction method is small in calculating quantity, fast in calculating speed, good in stability and high in calculating accuracy, and has a certain anti-noise property. The seismic data resolution ratio is improved.

Description

technical field [0001] The invention relates to oil field exploration, development and mining technology, in particular to a correction method for eliminating residual wavelet phases of seismic data to provide high-resolution seismic graphics and data for reflecting underground stratum layers and oil reservoir description. Background technique [0002] With the development of seismic exploration technology, the difficulty and depth of oil and gas exploration are increasing, and the resolution requirements for seismic data are also increasing. Deconvolution is the most effective way to improve the resolution of seismic data. Seismic convolution model is one of the most basic models in seismic exploration data processing. Conventional seismic data deconvolution processing is based on seismic convolution model. A fundamental assumption of the deconvolution process is that the seismic wavelets are minimally phased. Through this assumption, the phase spectrum of the wavelet ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 高少武祝树云
Owner BC P INC CHINA NAT PETROLEUM CORP
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