含气饱和度对碳酸盐岩声波速度影响的试验研究

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摘要用试验方法探讨碳酸盐岩的纵横波速度、纵横波波速比随不同含气饱和度的变化关系。结果表明：(1) 随着含气饱和度的增加，纵波速度、纵横波波速比总体呈减小趋势，而横波速度几乎不受影响。(2) 声波频率对纵横波速度、纵横波波速比都有一定影响，不同频率下的纵横波波速比主要分布范围不一样，Sg = 0%时的纵横波波速比大于Sg = 100%时的纵横波波速比。(3) 将完全饱和的岩石模拟为水层，随着水层中含气量的增加，纵横波波速比从背景值开始递减，递减幅度越大说明水层逐渐向气层过渡，同时结合纵波速度递减的特点为利用声波测井资料指示气层奠定理论基础。(4) 所探讨的纵横波波速比可为碳酸盐岩气层识别提供一定的参考依据，但实际应用时还需结合其他相关参数才能更准确地评价储层。

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关键词 ：岩石力学, 碳酸盐岩, 含气饱和度, 纵横波速度, 纵横波波速比, 气层

Abstract：The variations in the P- and S-wave velocities，the ratio of P-wave velocity to S-wave velocity(Vp/Vs) of carbonate rock with different gas saturations are studied by using the experimental methods. The results show as follows：(1) With the increase in gas saturation，the P-wave velocity and Vp/Vs both show a decreasing tendency，while S-wave velocity is almost unaffected. (2) The acoustic wave frequency has some influence on the acoustic wave velocity and Vp/Vs. The main distribution of Vp/Vs is varied with different frequencies，general rule is that Vp/Vs when Sg = 0% is greater than that when Sg = 100%. (3) Completely regarding water-saturated rock as the water zone，with the increase in gas content in water zone，the Vp/Vs will begin to decrease from the background value，the sharper decline illustrates transition from the water zone to the gas zone. Meanwhile，combining with the decreasing character of P-wave velocity，the theoretical basis for indicating gas zone utilizing acoustic logging data is settled. (4) Although Vp/Vs can offer some reference for identifying gas zone of carbonate rock，other relevant parameters must be combined to accurately assess the reservoir in practical application.

Key words： rock mechanics carbonate rock gas saturation P- and S-wave velocities ratio of P-wave velocity to S-wave velocity(Vp/Vs) gas zone

收稿日期: 2010-05-10

引用本文:

朱洪林，刘向君，刘洪. 含气饱和度对碳酸盐岩声波速度影响的试验研究[J]. 岩石力学与工程学报, 2011, 30(S1): 2784-2789.
ZHU Honglin，LIU Xiangjun，LIU Hong. EXPERIMENTAL RESEARCH ON EFFECTS OF GAS SATURATION ON ACOUSTIC WAVE VELOCITY OF CARBONATE ROCK. , 2011, 30(S1): 2784-2789.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS1/2784

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