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几乎所有的射线跟踪法都忽略地震波振幅的分析,而仅利用了可用信息的一半.本文所介绍的方法是一种射线跟踪成象和宽孔径反射波振幅变换相结合的方法. 首先把常规的X-T域的地震资料变换成截距时间τ和射线参数p的域,以恢复平面波响应.下一步是求出表示τ和(?)的函数的平面波反射系数序列。然后,在我们的反演方法中用二个任意选择的道的反射系数R(τ,p),来导出慢度—深度和密度—深度剖面.很明显:利用地震波振幅(在这种方法中,我们考虑声波情况)可使反演方法提高稳定性和精确性。在水平层状介质中,利用这种方法能分别恢复出速度和密度剖面.由于这种方法是利用了大偏移距资料,因此它可用于分別恢复出更大深度的速度和密度剖面。
Almost all ray tracing methods ignore the analysis of seismic amplitude but only use half of the available information.The method described in this paper is a combination of ray tracing imaging and wide aperture reflection wave amplitude transformation.First, The seismic data in the XT domain are transformed into the intercept time τ and the field of the ray parameter p to recover the plane wave response The next step is to find the plane wave reflection coefficient sequence that represents the function of τ and (?). The slowness-depth and density-depth profiles are then derived using the reflection coefficients R (τ, p) of two arbitrarily chosen channels in our inversion method. Clearly: Using the seismic amplitude (in this method , We consider the sound wave situation) can make the inversion method to improve the stability and accuracy. In horizontal layered media, velocities and density profiles can be recovered separately using this method, which can be used to recover velocity and density profiles at greater depths, respectively, because of the large offset data used.