交互地震子波提取技术

A interactive technique for seismic wavelet extraction

利用子波的最大相位和最小相位分解技术,在复赛谱域得到一组具有相同振幅谱、不同相位谱的子波集合。根据方差模最大等数学物理准则以及用户对地震资料的先验信息和处理要求,借助于交互处理工具,用户可以从子波集合中确定其希望并认可的地震子波,从而完成子波反褶积、子波零相位化等提高分辨率的处理工作,达到识别和追踪薄层反射的地质要求。对物理模型采集的地震记录和实际野外采集的地震记录进行了子波提取实验,并利用提取的地震子波对地震资料进行了提高分辨率处理。实验结果证明了该方法的正确性和有效性。

By the decomposition of the minimum and maximum phase components, the group of wavelets with the same amplitude spectrum and different phase spectrum could be found in cepstrum domain, On the basis of the criterion of maximum variance module and the prior information and process demand, and by means of interactive process tool, users can find a desired wavelet among the group of wavelets. Furthermore, the seismic resolution can be improved by wavelet deconvolution and wavelet phase modulation for identifying and tracing the reflection events of thin-layers. Wavelets have been extracted from physical model record and real .seismic record, and the tests for improvement of resolution also have been carried out with the extracted wavelets. All those verified the validity and effectiveness of the method.