西南石油大学学报(自然科学版)

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A Study on the Method of Keeping SNR in the Phase#br# Decomposition Deconvolution

Zhang Hua1,2,3*, Zhang Jinfeng4, Yang Bo5, Yuan Xiaohua5, Chen Aiping2,3   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China
    2. Geophysics Prospecting Company,CCDC,CNPC,Chengdu,Sichuan 610213,China
    3. Mountain Geophysical Technology Test Center,CNPC,Chengdu,Sichuan 610213,China
    4. Exploration and Development Research Institute,Xinjiang Fukang Zhundong Oil Base,Fukang,Xinjiang 831511,China
    5. Luliang Oilfield Operation District,Xinjiang Oilfieled Company,CNPC,Karamay,Xinjiang 834000,China
  • Online:2015-10-01 Published:2015-10-01

Abstract:

The deconvolution technology is the major method to improve the resolution of seismic data. The traditional deconvolution
is based on minimum phase wavelet assumption,but in fact,this is inconsistent with the actual situation of mixed
phase seismic wavelet. Due to the formation′s absorption effect and the weak high frequency signal in the real seismic data,
the high frequency signal is susceptible to high frequency noise pollution. The traditional deconvolution reduces the SNR of
seismic record at the same time when improving the resolution,so the conflicts of the SNR and resolution of in practical seismic
exploration work is serious. This paper puts forward a kind of mixed phase wavelet deconvolution method,which can keep the
SNR of seismic data and at the same time finish phase decomposition. This method when improving seismic record resolution,
can automatically control the high-frequency noise of seismic data to achieve harmony between the resolution and SNR,and
improve the ability of seismic record characterization of subsurface structure.

Key words: phase decomposition, deconvolution, noise, resolution, signal/noise ratio

CLC Number: