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常规海上拖缆采集数据存在受海水面的虚反射(鬼波)引起的陷波特性,而近年发展的变深度缆采集技术,通过专门的去鬼波处理方法可获得宽频数据.基于变深度缆沉放深度特点以及缆深鬼波滤波算子,推导出变深度缆陷波频率关于炮检距变化公式,阐述了变深度缆数据的陷波频率具有明显的多样性分布特征.同时,基于斜缆采集的鬼波滤波算子的平均叠加脉冲响应谱分析以及炮集记录的平均叠加谱分析,验证了变深度缆具有宽频采集特点.通过与等深度缆平均叠加谱特征比较,进一步验证了斜缆更能在一定程度上抑制海面虚反射,扩宽频带.
Conventional maritime streamers collected data have the characteristics of notch caused by the ghost wave of seawater surface, and the wideband cable acquisition technology developed in recent years can obtain wide-band data by special de-ghost processing method.Based on the variable depth The characteristics of cable depth and the operator of deep ghost wave filtering are deduced and the variation formulas of notch frequency of variable depth cable are derived.The variation of notch frequency in variable depth cable has obvious diversity distribution characteristics.At the same time, The analysis of the average impulse response spectrum of the ghost wave filter operators collected by the oblique cable and the average superimposed spectrum analysis of the shot record verifies the wideband acquisition characteristics of the variable depth cable.By comparing with the average superimposed spectrum characteristics of the equal depth cable, Hanging cable to a certain extent, inhibit the sea reflection, broaden the band.