起伏地表组合震源地震波场定向方法
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摘要
多个震源组合激发通过改变激发延时,可以得到沿某方向传播的地震波场,即定向地震波场激发技术,它可用于特定目标体的照明与探测之中.本文以水平地表的组合震源定向激发原理为基础,推导了倾斜地表情况下的组合震源定向激发公式,并计算绘制了其理论方向图.另外本文将组合震源波场定向方法推广至任意起伏地表,根据惠更斯菲涅尔原理,提出了旋转坐标方法,即将水平坐标旋转至定向波场传播方向法向的倾斜坐标,可方便地计算震源传播至定向波场波前面的走时,作为组合震源的激发延时.根据本文提出的方法,我们分别计算了倾斜地表条件与复杂地表条件定向地震波场的组合震源延时参数,通过波动方程数值模拟技术得到的波场快照验证了本文方法的有效性.
By changing the excitation delay of a multiple-source array,we can get the seismic wave field which propagates in a specific direction.It is called directional seismic excitation technology which can be used to illuminate and explore specific target objects.Based on the principle of source array directional excitation on the horizontal surface,this study derived the equations of source array directional excitation on the inclined surface and calculated the theoretical direction diagrams.Moreover,this work extended the application range of the source array directional excitation method to the case of the surface with any topography,and proposed the rotating coordinate method in accordance with Huygens Fresnel principle,which meant rotating from horizontal coordinates to inclined coordinates in which the directional wave field propagates.It made it convenient for calculating the travel time from sources to the wave front of the directional wave field,and can be regarded as source array excitation delay.According to the method this paper proposed,we calculated source array delay parameters in the cases of both the inclined surface and complex surface.The snapshots from numerical simulation of wave equation technology verified the validity of this method.
引文
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