双相介质地震勘探纵向分辨率研究

摘要

The ability of seismic response to distinguish geologic phenomena depends on the resolution of seismic records . The resolution study in biphasic medium is useful to high resolution oil-gas and ocean seismic exploration technology. Combining the velocity and attenuation analysis, we studied the relationship between seismic exploration resolution and wave propagation length based on the BISQ model. The paper also analyzed the resolution changing in different medium parameter. The study indicates that: with the wave propagation dominant frequency smaller and the resolution is lower; with the permeability higher the resolution is relatively higher, with the coefficient of viscosity higher the resolution is relatively lower, with the jet length higher the resolution is relatively lower when else condition keep invariant.%利用地震响应分辨地下地质现象的能力,取决于地震记录分辨率的大小,基于双相介质模型研究地震勘探分辨率可以促进油气资源、海洋高分辨率地震勘探技术的应用与开发.基于BISQ双相介质模型,结合相速度与衰减分析,研究了雷克子波在双相介质中传播时纵向分辨率随传播距离的变化.同时,分析了渗透率、黏滞系数、喷射流长度等模型参数变化对于纵向分辨率的影响.研究表明:由于BISQ模型的衰减机制,雷克子波在传播过程中,主频不断向低频端移动,分辨率不断降低；在其他条件相同时,渗透率增加,分辨率相对较高,黏滞系数增加,分辨率相对较低,喷射流长度增加,分辨率相对较低；子波纵向分辨率在传播距离不非常大的情况下,分辨率与传播距离可以近似的作为线性关系处理.