被动源体波干涉数据处理流程研究

Study of passive source body-wave interferometry data processing flow

近年来,被动源地震勘探逐渐成为地震勘探的热点.被动源勘探方法可以从难以识别的背景噪声中提取其携带的地下构造信息以分析地震波所穿过介质的地质特性.目前对于被动源数据的研究正逐渐广泛应用,主要集中在面波城市勘探及地球构造勘探领域中.事实上,重构得到的被动源拟炮集地震记录中也可以提取出来自地下深层的反射体波信息,其与常规反射波地震勘探记录存在诸多相似点,也可以完成被动源反射波数据处理.本文通过被动源数据正演建模,验证了从被动源拟炮集记录中提取体波信息的可能性.其次分析实际采集的被动源数据特点,分析被动源模型数据与实际数据间的区别与联系,总结得到了一套类似于主动源反射波地震勘探方法的深层被动源体波低信噪比数据处理流程.最后,以某地区采集的一套被动源地震数据为例进行处理验证,获得了良好的处理结果.

In recent years,passive seismic exploration has gradually become a hot topic of seismic exploration.The passive source exploration method can extract the underground structure information from the background noise which is difficult to identify to analyze the geological characteristics of the medium through which the seismic wave passes.At present,the research of passive source data is gradually widely applied,mainly in the field of surface wave urban exploration and earth structure exploration.In fact,the reconstructed passive seismic records can also extract the reflected body wave information from the deep subsurface,which has many similarities with the conventional seismic exploration records,and can also complete the data processing of the reflected body wave from the passive source.In this paper,the forward modeling of passive source data is used to verify the possibility of extracting body waves information from passive source records.Secondly,the characteristics of the acquired passive source data are analyzed,and the differences and connections between the model data and the actual data are analyzed.A set of processing flow of the low S/N deep body wave data from passive sources,which is similar to the active source reflected wave seismic exploration method,is summarized.Finally,a set of passive seismic data collected in a certain area is taken as an example for processing verification,and a good processing result is obtained.