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本文利用超声物理模型实验技术,对一个二维双层各向同性的水平层物理模型,进行了野外井间地震模拟。利用接收换能器的方向特性,有目的地作定向接收井间波场实验,研究检波器定向和其方向特性对井间地震数据采集的影响。实验资料表明,不同定向接收的井间波场有明显的差异。通过对井间地震波场的简单剖析和实验结果对比分析,得出了定向接收到的井间地震波具有明显滤波效应不能完全反映井间波场特性,以及震源位置也会对定向接收到的波场产生影响的结论。因此,要设计出最佳井间地震观测系统,必须同时考虑射线有限视角与检波器的方向角,同时还应注意,检波器的安放也会严重影响井间地震层析成像的质量。
In this paper, a two-dimensional bilayer isotropic horizontal-layer physical model is used to simulate the cross-country seismicity by using the ultrasonic physical model experimental technique. Taking advantage of the directional characteristics of the receiving transducer, a directional interception well field experiment was purposely conducted to study the influence of the geophone orientation and its directional characteristics on crosswell seismic data acquisition. Experimental data show that there are obvious differences between the well-to-field wave fields received by different orientations. Through the simple analysis of the crosswell seismic wavefield and experimental results, it is concluded that the obvious filtering effect of the received crosswell seismic wave can not completely reflect the characteristics of the crosswell wavefield, and the position of the source will also affect the received wave field The impact of the conclusion. Therefore, to design the best crosswell seismic observation system, the finite angle of view of the ray and the azimuth of the detector must be taken into consideration. At the same time, it should be noted that the placement of the detector will also seriously affect the quality of crosswell seismic tomography.