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在一般的地震波计算中,地球介质可以当作各向同性的完全弹性体来对待。而对地表土壤和精细观测,粘弹性介质模型比完全弹性模型更符合实际。可控震源是近年来发展起来的精确可控、安全有效的新型震源,但国内对可控震源传播动力学的研究较少。对可控震源激发的地震波在粘弹性介质中的传播,用有限差分方法进行了数值模拟,给出了Kelvin一阶粘弹性波动方程组、吸收边界条件和震源处理。提出了检波器接收信号加速度和传播距离的三次多项式指数关系式,比线性指数关系更准确。使用该公式可以预测采集系统有效接收距离,指导测线布置。
In general seismic wave computations, the Earth’s medium can be treated as an isotropic, fully elastic body. For surface soil and fine observation, the viscoelastic medium model is more realistic than the complete elastic model. Vibrator is a new type of source that is accurate and controllable, safe and effective developed in recent years. However, there are few researches on the propagation dynamics of vibrator in China. The propagation of seismic waves excited by vibroseis in viscoelastic media is numerically simulated by the finite difference method. The first-order viscoelastic wave equations of Kelvin, absorption boundary conditions and source processing are given. The cubic polynomial exponential relationship between the accelerometer and the propagation distance of the received signal is proposed, which is more accurate than the linear exponential relationship. Use this formula to predict the effective receiving distance of the acquisition system to guide the line layout.