应用三分量浅层地震反射方法探测隐伏活动断裂

多波多分量地震勘探方法在油气田勘探开发中日益受到重视,但在工程和活动断裂探测中过去还没有开展多波多分量地震勘探的先例.本文简要介绍了在北京黄庄—高丽营断裂上开展的三分量浅层地震反射试验数据采集和资料处理方法,以及取得的初步结果.试验结果表明,采用纵波震源或横波震源激发、三分量接收的浅层地震勘探方法,可获得较高信噪比的浅层地震纵波、横波和转换波剖面,特别是水平分量采集的横波和转换波可提供很有意义的地下结构和构造信息.综合利用纵波、横波和转换波剖面特征进行的地质分层和断层解释结果取得了与跨断层的钻孔联合地质剖面结果较好的一致性.

Application of the three-component shallow seismic reflection method to probing buried active faults

The multi-wave and multi-component seismic exploration method has been widely used in oil and gas field exploration and development. While this method has not been applied to engineering surveys and active fault investigations. This paper introduces briefly the data acquisition and processing methods applied to the three-component shallow seismic reflection test as well as some primary results on the Huangzhuang-Gaoliying fault in Beijing. The results show that using the shallow seismic data-acquisition technology with P-wave or S-wave vibroseis and three-component geophone, the shallow seismic P-wave, S-wave and converted-wave stacked section with high signal-noise ratio could be obtained. Especially the converted-wave and shear wave from horizontal components can reveal meaningful underground structure and tectonic information. Integrated geological interpretations of P-wave, S-wave and converted-wave staked sections yield stratification and fault structure which are consistent with the composite cross section from borehole data.