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本文通过一个三层结构的裂缝模型来研究地下裂缝对时差速度和反射振幅的影响。该物理模型在中间层内嵌入了一个相当于垂直裂缝区的酚醛圆盘。在裂缝走向和垂直裂缝走向之间,以15°的方位角沿七个方位布置地震测线。在这组实验条件下,我们观测到水平时差速度在裂缝走向上最大,并向垂直裂缝走向逐渐减小,而振幅随炮检距变化(AVO)而减少的比例由裂缝走向朝垂直裂缝走向逐渐增加。
In this paper, a three-layer fracture model is used to study the effect of underground cracks on the velocity and reflection amplitude. The physical model embeds a phenolic disk in the middle layer that corresponds to the vertical fracture zone. Seismic survey lines are arranged in seven orientations at an azimuthal angle of 15 ° between the strike of fractures and the direction of vertical fractures. Under this set of experimental conditions, we observed that the horizontal differential velocity was the largest in the fracture direction and gradually decreased toward the vertical fracture, and the proportion of the amplitude decreasing with the variation in offset (AVO) was gradually shifted from the fracture toward the vertical fracture increase.