Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (4): 78-81.doi: 10.3969/j.issn.1673-8926.2016.04.010

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Determination of seismic wave velocity by compressibility of rocks

Li Chuanliang，Zhu Suyang   

  1. （School of Oil & Natural Gas Engineering，Southwest Petroleum University，Chengdu 610500，China）
  • Online:2016-07-20 Published:2016-07-20

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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.

Key words: high resolution sequence stratigraphy, base level cycle, sequence boundary, sedimentary facies, Xujiahe Formation, Tongnan area

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