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现代地质 ›› 2006, Vol. 20 ›› Issue (4): 635-640.

• 能源地质 • 上一篇    下一篇

陆相油藏中砂泥岩互层时移地震遮掩效应及其对时移地震资料解释的影响

王大伟1,刘震1,赵伟2,夏庆龙3   

  1. 1中国石油大学 石油天然气成藏机理教育部重点实验室,北京102249;
    2中海石油研究中心(北京),北京100027;3中海石油(中国)有限公司 天津分公司,天津 塘沽300452
  • 收稿日期:2006-04-21 修回日期:2006-10-12 出版日期:2006-04-20 发布日期:2006-04-20
  • 作者简介:王大伟,男,博士研究生,1976年出生,地质资源与地质工程专业,主要从事油气田地质学的研究工作。
  • 基金资助:

    国家“863”计划项目(2003AA602110)

Masking of Sand/Mud Interbeds in Non-marine Reservoirs and It's Effect on Time-lapse Seismic Data Interpretation

WANG Da-wei1, LIU Zhen1, ZHAO Wei2, XIA Qing-long3   

  1. 1Key Laboratory for Hydrocarbon Accumulation in China University of Petroleum,Ministry of Education,Beijing102249,China;
    2CNOOC Research Center, Beijing100027,China;3Tianjin Branch of CNOOC Limited, Tianjin300452,China
  • Received:2006-04-21 Revised:2006-10-12 Online:2006-04-20 Published:2006-04-20

摘要:

从差异波形特征的角度出发,分析时移地震差异波形特征与砂泥岩互层油藏中油层速度变化的关系。通过建立由5层地层组成的楔形地质模型,运用褶积公式及时移地震求差公式,得到泥岩速度为2 400 m/s和砂岩速度为2 700 m/s条件下,互层中砂岩速度变化±150 m/s的时移地震响应。研究结果表明:砂泥岩互层的差异波形是一个多峰复合波,泥岩夹层的厚度是决定差异波形特征的一个主要因素,并且存在一个临界值,即四分之一主波长;如果泥岩夹层的厚度小于这一临界值,就会发生遮掩效应,即顶部油层的时移地震响应可以掩盖中、下部油层的时移地震响应。

关键词: 时移地震波形, 砂泥岩互层, 遮掩效应

Abstract:

Taking the differential characteristics of the time-lapse seismic waveform as a breakthrough point, the relation between the characteristics and velocity of sand/mud interbeds in non-marine reservoirs is analyzed. Under the following conditions, (1)a five-layer model which consists of mud and shale, (2)Pwave velocity in mud is 2,400 m/s, (3)P-wave velocity in sand is 2,700 m/s, and (4)variation in shear wave velocity in sand is 150 m/s, the study simulates the time-lapse seismic waveform of the five-layer model by the use of convolution and time-lapse difference formula. It is revealed that the time-lapse seismic waveform of interbeds is a multi-peak complex wave, and the thickness of middle shale is a critical factor for the characteristics of the seismic waveforms, which has a critical value about to a quarter of wavelength. The masking effect could be created when the thickness of middle shale is less than this value, in the other word, the time-lapse seismic responses of the upper layers will mask those of the bottom lays.

Key words: time-lapse seismic waveform, sand/mud interbed, masking effect

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