Using generalized S-transformation this work analyzes low frequency shadow on zero-offset VSP pre-stack data. With VSP geometry that directly receives up-going and down-going waves near target layers, this analysis quality will be improved. We also give low-frequency shadow attribute analysis process and corresponding processing method in the article. The field data examples show that our low frequency shadow detection method can indicate the existence of oil and gas.%本文选用零偏VSP叠前资料,利用广义S变换进行低频阴影分析,并借助VSP观测方式中可将井下检波器靠近目的层的特点,直接接收来自目的层的上行波和下行波信号,提高分析质量.本文还给出低频阴影属性分析流程及相应的处理方法.实际数据试算结果表明,应用低频阴影检测方法可指示油气的存在.
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