西南石油大学学报(自然科学版) ›› 2009, Vol. 31 ›› Issue (4): 31-34.DOI: 10.3863/j.issn.1674-5086.2009.04.006

• 地质勘探 • 上一篇    下一篇

相位移法高频补偿稳定性研究

杜增利1,2 徐峰3 刘文革2 姜庆国4   

  1. 1.四川石油管理局地球物理勘探公司,四川成都610213;2.“油气藏地质及开发工程”国家重点实验室•成都理工大学,四川成都610059;3.西南石油大学资源与环境学院,四川成都610500;4.大庆石油管理局物探公司,黑龙江大庆163357
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-08-20 发布日期:2009-08-20

STUDY ON THE STABILITY IN HIGH-FREQUENCY COMPENSATION WITH PHASE SHIFT METHOD

DU Zeng-li1,2 XU Feng3 LIU Wen-ge2 JIANG Qing-guo4   

  1. 1.Sichuan Petroleum Geophysical Prospecting Company,Chengdu Sichuan 610213,China;2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu Sichuan 610059,China;3.Resources and Environment College,Southwest Petroleum University,Chengdu Sichuan 610059,China;4.Geophysical Prospecting Company,Daqing Petroleum Administration,Daqing Heilongjiang 163357,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-08-20 Published:2009-08-20

摘要:

地震波在实际介质中的传播机制与其在理想弹性介质中不同,此时其携带的机械能被部分存储、部分耗损,使得地震波发生频散现象,在近地表疏松介质中这种吸收效应更为强烈,造成大沙漠区地震勘探得到的资料分辨率降低。为了有效提高地震资料的分辨率,对疏松介质的吸收效应进行合理补偿势在必行。但其能量补偿因子是一与频率有关的幂函数,随着地震波传播距离增大和频率提高而急剧加大,计算过程不稳定,进而产生大量人为假象。通过数值模拟研究了计算不稳定性的形成机制,在前人研究基础上,提出了保持计算稳定性条件。数值模拟和实际资料处理结果表明,在保持数值计算过程稳定、高频信号不发生畸变的前提下,应用相位移法可以最大限度地恢复被地层吸收、衰减的有效高频信号,合理地提高了地震资料的垂向分辨率。

关键词: 相位移, 地震波, 吸收, 补偿, 稳定性

Abstract:

The great difference exists between the propagation of wave motion in elastic media and the real media,the mechanic energy associated with the wave motion is absorbed by the media and the frequency dispersion happens as the wave motion passes through the media,the affection is intense in loose media.To improve the resolution of seismic data efficiently,the compensation to the absorption of the loose media should be applied.The phase shift compensation procedure may cause instability and generate undesirable artifacts in the solution as the compensation factor is an exponential function of frequency and travel time.The mechanism of the instability is studied by mathematical modeling,and the stable condition of the calculation is pointed out.The mathematical modeling of seismic energy absorption and compensation of wave propagation in loose media is studied with the phase shift technique in F-X domain based on the propagation mechanism of wave motion in elastic-viscid media.The results of modeling and real seismic data show that the absorption of energy of high frequency can be recovered and the temporal resolution of seismic data is improved efficiently without the aberrance of high frequency signal with the method presented in the paper.

Key words: phase shift, seismic wave, absorption, compensation, stability

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