地震记录相似性的小波属性度量方法研究

为了提高三维低频资料(主频15Hz~30Hz)断层检测精度,探讨了小波地震属性与相干结合的检测方法。当断层的水平断距小,断层二侧地震记录的波形特征相似时,单靠相干方法已不能明显地反映断层。针对此问题,分析了多种相似性度量方法,最后从地震属性方法出发,提出基于小波属性体的相干方法改善检测效果。实际资料处理表明了该方法的合理性和实用性,不仅更细致地度量了相似性,还为地震勘探量化参数的精细分析提供了一条思路。

Research on measurement method of similarity of seismic records with wavelet attributes

In order to improve precise of measurement of faults by 3-D data with low frequency (primary frequency in 15 Hz~30 Hz), this paper discusses a method combined wavelet attribute with coherency. When horizontal distance of faults are very small and wave shape of seismic records near the faults are very similar, coherency method can not show the faults clearly itself. Focusing on the problem, we analysis several kinds of methods of measuring similarity and, at last, propose coherency one based on wavelet attributes to improve capacity of fault detection. The applications show that the method is reasonable and utilitarian. The method not only describes similarity more precisely, but also provides a way of accurate analysis to quantitative parameters of seismic exploration.