地球物理学进展 ›› 2003, Vol. 18 ›› Issue (2): 331-335.doi:

• 论文 • 上一篇    下一篇

变质岩区地震波速度的特点及其影响因素--以中国大陆科学钻探孔区为例

姜修道1, 朱光明2   

  1. 1. 长安大学地球科学与国土资源学院,西安,710054;
    2. 长安大学地质工程与测绘工程学院,西安,710054
  • 收稿日期:2003-01-27 修回日期:2003-03-20 出版日期:2003-06-25 发布日期:2003-06-25
  • 作者简介:姜修道:男,1960年生,陕西户县人,在读博士,副教授.主要从事地质和地球物理教学和研究.
  • 基金资助:

    中国大陆科学钻探中心项目(中国大陆科学钻探工程先导孔VSP子工程)资助.

Characteristics and effect factors of seismic velocity in metamorphic rock area:An example from CCSD borehole area

JIANG Xiu-dao1, ZHU Guang-ming2   

  1. 1. College of Earth Science and National Territory Resources,Chang'an University, Xi'an 710054, China;
    2. College of Geologic Engineering and Surveying Engineering, Chang'an University, Xi'an 710054, China
  • Received:2003-01-27 Revised:2003-03-20 Online:2003-06-25 Published:2003-06-25

摘要: 地震波速度是地震勘探中最重要的一个参数,而VSP测量是一种比较直接且行之有效的获取地震波速度的方法.文中结合中国大陆科学钻探工程预先导孔和先导孔的VSP速度分析成果,总结超高压变质岩地区地震波速度的主要特征;探讨影响变质岩地震波速度的因素.认为除密度和岩性外,变质作用的类型和强度是决定性因素,而变质期后和/或后期的各种构造地质作用对变质岩地震波速度的影响是显著的,但范围常常又是局部的.

Abstract: Velocity is the most important parameter in seismic survey, and VSP is a direct and valid way in acquiring it. With the results of VSP velocity analysis of the two CCSD pilot holes(the one 1000 m and the other 2000m deep), the characteristics of seismic velocity of the ultrahigh pressure metamorphic rocks in the holes area are summarized, and then the factors affecting velocity are discussed. It is believed that the type and strength of metamorphism are critical besides density and geothology of the rocks and that various post-metamorphism tectonisms will give rise to apparent effect on seismic velocity but they often act locally.

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