STUDY ON THE RANGE OF MULTIPLE REFLECTED REFRIACTION WAVE STRIPS IN SHALLOW WATER ENVIRONMENT
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摘要:
浅水地震资料中，直达波上方会出现一个明显的“扫帚状”的条带，确定其地震波成份有利于对地震传播规律的认识，可为海上实际作业建立合适的观测系统提供参考依据，同时也可为后期资料处理提供理论依据。本文在陆地多次反射折射波传播路径分析的基础上，通过对简单模型的数值模拟结果分析，确定了浅水环境中位于直达波上方的“扫帚状”条带为海底表层介质产生的多次反射折射波的整体反映。定量分析了多次反射折射波的“扫帚状”条带的范围及其影响因素，并结合实际地震资料进行了验证。
Abstract:On shallow-water seismic profiles, there is always a "broom-like" band above the direct wave. The determination of wave composition of the band is helpful to the understanding of seismic wave propagation, which will provide a reference basis for establishing an appropriate observation system for offshore operation and data processing. Based on the analysis of wave propagation path of multiple reflection of refraction waves on land, by analysis of the numerical simulation results of a simple model, it is concluded that the "broom-like" band above the direct wave in the shallow water environment is the overall reflection of the refracted wave generated by some kinds of subsurface medium. In addition, quantitative analysis of the scope of the "broom-like" band of the multi-reflected refraction waves and studies of their influencing factors are carried out and verified with actual seismic data.
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