西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

保持信噪比的相位分解反褶积方法研究

张华1,2,3 *,张金风4,杨波5,袁小华5,陈爱萍2,3   

  1. 1.“油气藏地质与开发工程”国家重点实验室· 成都理工大学,四川成都610059
    2. 中国石油川庆钻探工程有限公司地球物理勘探公司,四川成都610213
    3. 中国石油物探技术试验基地山地地震技术试验基地,四川成都610213
    4. 新疆阜康准东石油基地勘探开发研究所,新疆阜康831511
    5. 中国石油新疆油田分公司陆梁油田作业区,新疆克拉玛依834000
  • 出版日期:2015-10-01 发布日期:2015-10-01
  • 通讯作者: 张华,E-mail:zhanghua_sc@cnpc.com.cn
  • 基金资助:

    中国石油天然气集团公司十二五重大科研项目(2011B 3706)。

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

摘要:

反褶积是目前提高地震数据分辨率的主要方法,传统的反褶积大都建立在地震子波最小相位的假设之上,这
与实际情况下地震子波更接近混合相位的事实不符。由于地层的吸收作用,实际地震信号中的高频成分较弱,很容易
受到高频噪声的污染。地震记录经过常规反褶积处理之后,在提高分辨率的同时,降低了地震记录的信噪比,信噪比
与分辨率的矛盾在实际地震勘探中十分突出。为此,提出一种基于相位分解并能保持信噪比的混合相位子波反褶积
方法,实现混合相位子波反褶积,在提高地震记录分辨率的同时,能自动控制高频噪声对地震资料信噪比的影响,使得
分辨率和信噪比达到相对和谐,提高地震记录表征地下构造的能力。

关键词: 相位分解, 反褶积, 噪声, 分辨率, 信噪比

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

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