井旁裂缝几何特性模拟实验研究

EXPERIMENT ON GEOMETRICAL PROPERTIES OF FRACTURES NEAR BOREHOLE

用实验模拟法研究了井旁地带多个平面裂缝和单个一般形状裂缝对纵波的反射 ,应用二维地震勘探中的绕射扫描偏移叠加技术对实验测量的反射波波形剖面进行了处理 ,获得了井旁介质结构的平面图像 ,确定了井旁裂缝的倾角、尺度和位置等几何特性。结果表明 ,运用绕射扫描偏移叠加技术对裂缝反射波的处理结果与实际实验中裂缝的布置结构一致。

The acoustic reflection of near borehole fractures on many planes and a curved surface was simulated experimentally. The technique of diffraction scanning migration stack for two dimensional seismic exploration was applied to the processing of experimental data, and the images of the near borehole structure were achieved. The geometrical properties of the fractures, such as the dip, location and dimension, were found from the images. The processing results are in good agreement with the actual values.