炮检距对地震分辨率影响的研究

The effect of offset on the resolution of seismic survey

1. 中国地质大学,北京 100083;2. 东方地球物理公司,河北涿州 072751

China University of Geosciences, Beijing 100083, China

在多次覆盖水平叠加处理中,因为不同炮检距道的垂向分辨率不同,使得动校拉伸后地震剖面的垂向分辨率降低。为此,分析了炮检距对地震垂向分辨率的影响,并从惠更斯原理出发,推导了炮检距与地震横向分辨率的关系式,讨论了炮检距对地震横向分辨率的影响。通过对实际地震资料的处理和分析,揭示了不同炮检距道的地震信息所存在的差异,解释了造成这种差异的原因,指出了在高分辨率地震采集设计时应考虑的问题,给出了消除炮检距对地震分辨率影响的方法。

The stretch of the NMO in the seismic data processing reduced the resolution of the seismic section. This effect isn' t ascribed to NMO but to offset itself because of the different resolution. The paper not only analyzed the effect of the offset on the vertical resolution of seismic survey, but also educed the relationship between offset and horizontal resolution of seismic survey from the theory of Huygens, and discussed the affection of offset on the horizontal resolution of seismic survey. Moreover, it showed the seismic information' s difference between different offset traces by real seismic data sets analysis results, explained the reason and pointed out the problem, which has some instructional meaning for seismic survey.