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本文提出的“射线参数法”,可由多道地震记录谱直接估算层速度或层速度线性梯度值。与现今广泛使用的基于DIX公式的叠加速度谱和近几年发展的τ-p图谱相比较,该法可用于广角反射和(或)折射资料,而且信噪比很高。射线参数法系依据Bullen的时距曲线参数方程,通过对射线参数p的微商式作迭代,实现了用计算机作自动反演,并用此法对大西洋中脊侧翼IPOD 396钻孔附近一沉积池的反射资料进行了估算,得出了沉积层速度线性梯度值为1.9s~(-1),相应基底反射的相似度值高达0.38。
The “ray parameter method” proposed in this paper can directly estimate the linear gradient of layer velocity or layer velocity from multi-channel seismograms. Compared with the superposition velocity spectrum widely used today based on the DIX formula and the τ-p spectrum developed in recent years, the method can be used for wide-angle reflection and / or refraction data and has a high signal-to-noise ratio. Based on Bullen’s time-distance curve parameter equation, ray-parameter method was used to automatically invert the ray parameter p by using the derivative of computer, and a deposition pool near the IPOD 396 hole on the flank of the mid-oceanic ridges The results show that the linear gradient of sediment velocity is 1.9s ~ (-1) and the similarity of the corresponding basal reflection is as high as 0.38.