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Distinguishing Oil and Water Layers in a Porous cracked Medium by Interpreting acoustic logging Data on the Basis of hudson theory

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Journal of Earth Science 2017年第3期28卷 500-506页

作者： Xue'ang Zhang Zhuwen Wang Zhichao Yang Engineering Research Center of Nuclear Technology Application Ministry of EducationEast China University of TechnologyNanchang 330013China Faculty of GeoExploration Science and Technology Jilin UniversityChangchun 130000China School of Geophysics and Measurement-Control Technology East China University of TechnologyNanchang 330013China

During surveys, water layers may interfere with the detection of oil layers. In order to distinguish between oil and water layers in a porous cracked medium, research on the properties of cracks and oil and water layers and their relation to acoustic logging rules is essential. On the basis of hudson＇s crack theory, we simulated oil and water layers in crack-porous medium with different crack parameters corresponding to the well-field response. We found that in a cracked medium with high crack angle or low number density of cracks, compressional and shear wave velocities are sensitive to crack characteristics; further, these velocities are more sensitive to crack characteristics when the waves propagate through the water layer than when they propagate through the oil layer. Compressional and shear wave velocities increase with an increase in crack angle： in the water layer, the increase is approximately linear. On comparing the full waveforms observed in the oil and water layers, we find that the amplitudes of most waves are higher in the water layer. Among the considered waves, the Stoneley wave suffers maximum amplitude attenuation in the oil layer. The maximum excitation intensity for oil layer is greater than that for the water layer. These results can guide further cracked media logging field exploration work.

关键词： crack acoustic logging hudson theory numerical simulation reservoir

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