地球物理学进展 ›› 2018, Vol. 33 ›› Issue (5): 2097-2101.doi: 10.6038/pg2018BB0430

• 应用地球物理学Ⅰ(油气及金属矿产地球物理勘探) • 上一篇    下一篇

不同时频变换谱比法品质因子Q估算效果对比分析

赵秋芳1,2(),党鹏飞1,云美厚1,2,*(),李伟娜1   

  1. 1. 河南理工大学资源环境学院,河南焦作 454000
    2. 中原经济区煤层(页岩)气河南省协同创新中心,河南焦作 454000
  • 收稿日期:2017-12-12 修回日期:2018-07-26 出版日期:2018-10-20 发布日期:2019-01-11
  • 通讯作者: 云美厚 E-mail:qfzhao@hpu.edu.cn;yunmeihou@163.com
  • 作者简介:赵秋芳,女,1978年生,在读博士研究生,主要从事地震波吸收衰减正反演方法理论及矿山微震监测等方面的研究.
  • 基金资助:
    国家自然科学基金(41772375);河南理工大学博士基金(B2009-85)

Comparative analysis of quality factor Q estimated by spectral ratio method based on different time frequency transform

ZHAO Qiu-fang1,2(),DANG Peng-fei1,YUN Mei-hou1,2,*(),LI Wei-na1   

  1. 1. Institute of Resources and Environment, Henan Polytechnic University, Henan Jiaozuo 454000, China
    2. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Jiaozuo 454000, China
  • Received:2017-12-12 Revised:2018-07-26 Online:2018-10-20 Published:2019-01-11
  • Contact: Mei-hou YUN E-mail:qfzhao@hpu.edu.cn;yunmeihou@163.com

摘要:

基于时频分析技术的谱比法品质因子Q估算已成为地震资料Q估算最常用、最有效的方法之一.针对目前常用的短时傅里叶变换(STFT)、小波变换(WT)和S变换(ST)三种时频分析方法,基于三层水平层状介质模型的衰减地震响应,对比分析了三种时频变换谱比法品质因子Q估算应用效果.结果表明,基于S变换的谱比法Q估算精度最高.进一步针对不同厚度气层楔状模型衰减地震响应,采用基于S变换的谱比法探讨了获得理想Q估算值的最小含气储层厚度应不小于地震子波的主波长.

关键词: 时频变换, 谱比法, 品质因子, Q值估算, 含气储层

Abstract:

The spectral ratio method based on time frequency analysis technique has become one of the most commonly used and effective methods for seismic data Q estimation. According to three commonly used time-frequency analysis methods, which are Short Time Fourier Transform (STFT), Wavelet Transform (WT) and S Transform (ST), it is analyzed that the application effect of three time frequency transform used in spectral ratio method quality factor Q estimation based on the attenuation seismic response of three layered medium model. Results shows that the spectral ratio method based on S transform can get the highest accuracy of Q estimation. Meantime, the minimum gas reservoir thickness to get ideal Q estimation value, which should not be less than the main wavelength of the seismic wavelet, is analyzed for the attenuation seismic response of different thickness gas layer wedge model by the spectrum ratio method based on S transform.

Key words: time frequency transform, spectral ratio method, quality factor, Q estimation, gas reservoir

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