碳酸盐岩地层中全波列声波测井实验研究

本文用模型实验研究了声波在致密碳酸盐岩地层井中的传播特性。采用合金钼模拟致密碳酸盐岩地层，按１０：１的比例制成缩小的模型井。模型井呈圆柱形，高０．４ｍ，直径０．３ｍ，中心井孔直径０．０２ｍ。在并中充水时接收到一组全波列声波。实验观测到全波列中的折射纵波、折射横波、斯通利波和基本特征与理论分析一致，但实测的折射纵横波幅度比及它们的几何衰减与理论分析不符。我们认为引起这些差异的主要原因是理论分析没有考

Experimental research on full-wave train acoustic logging in carbonate formation

The propagation characteristic of acoustic wave in borehole that penetrates compact carbonate formation is analysed by doing model experiment. Aluminium alloy is used to model compact carbonate formation, through which a modeled borehole in 10: 1 scale penetrates. This modeled borehole is cylindrical, whose depth is O. 4m, diameter 0. 3m, and central borehole diameter 0. 02m. An acoustic full wave train is received when borehole is filled with water. Some main characteristics of refracted compressional wave, refracted shear wave and Stoneley wave in full wave train observed in this experiment coincide with the theoretical ones, while the real ratio of P-wave amplitude to S-wave amplitude and their geometric divergence do not tally with the theoretical ones. It is deemed that the main reason why the difference appears is that theoretical analysis neglects the directivity of acoustic source.