技术方法

应用压缩系数确定地震波速的新方法

  • 刘小亮 ,
  • 王超勇
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  • 西南石油大学石油与天然气工程学院,成都610500
李传亮(1962-),男,博士,教授,主要从事油藏工程方面的教学与科研工作。地址:(610500)四川省成都市新都区西南石油大学石油与天然气工程学院。电话:(028)83033291。E-mail:cllipe@qq.com。

网络出版日期: 2016-07-20

基金资助

国家重大科技专项“多层疏松砂岩气藏开发关键技术”(编号:2011ZX05027-003-01)资助

Determination of seismic wave velocity by compressibility of rocks

  • LIU Xiaoliang ,
  • WANG Chaoyong
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  • (School of Oil & Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,China)

Online published: 2016-07-20

摘要

地震波属于应力波和弹性波,其波速与介质密度和介质压缩系数密切相关。计算单相介质的地震波速有理论公式,而计算双相介质的地震波速却没有理论公式,现有的经验公式和物理模型都存在一定的缺陷,而且夸大了孔隙度对地震波速的影响。根据研究,地层双相介质可以视为拟单相介质,因此采用单相介质的地震波速计算公式对其波速进行计算,只是计算时需采用基质和孔隙流体的平均参数。根据计算分析,在地层孔隙度范围内,孔隙度对地震波速的影响并不大。本次研究为确定地震波速提供了一个新的思路,展现了良好的实用性和应用前景。

本文引用格式

刘小亮 , 王超勇 . 应用压缩系数确定地震波速的新方法[J]. 岩性油气藏, 2016 , 28(4) : 78 -81 . DOI: 10.3969/j.issn.1673-8926.2016.04.010

Abstract

Seismic wave is stress wave, and also elastic wave, of which the velocity is closely related with density and compressibility of media. Seismic wave velocity of single?phase media can be calculated by theoretical equations,while there is no theoretical equation for calculating the seismic wave velocity of dual?phase media. The existing empirical equations and physical models have some drawbacks, and exaggerate the effect of porosity on seismic wave velocity. According to the study of this paper, two?phase media can be viewed as pseudo single?phase media, so its seismic wave velocity can be calculated by the equation of single?phase media with the average parameters of matrix and fluid in formation rocks. The calculation analysis shows that porosity has not so much effect on seismic wave velocity as known before in the range of formation porosity. The equation proposed in this paper can be taken as a new method to determine the seismic wave velocity of formation, with practicability and broad application prospect.

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