基于系统辨识提高地震资料分辨率

提高地面地震资料垂向分辨率是地球物理领域研究的难点和热点。本文提出了利用测井资料提高地面地震资料分辨率的新方法。通过地层对地震波吸收的线性系统假定,首先建立了地面地震信息与声波测井信息相互联系的理论模型,然后基于系统辨识技术估计地层对地震波吸收的系统特性,进而对地面地震资料进行补偿性高频恢复。对不同分辨率的正演模拟资料和实际地面地震资料的处理结果表明,该技术在保持原地震资料主要特征不变的条件下,主频为代表的优势频带提高约10~20Hz,频带拓宽约10Hz,有效提高了地震资料的垂向分辨率。

Improving the seismic data resolution based on system discrimination

Improving seismic data vertical resolution for surfaceis is difficult and the hotspot of research in geophysical field.In the paper,a new method for improving surface seismic data resolution by using logging data is provided.On the assumption that the absorption of seismic wave for stratum appears linear system,the theoretical model combining surface seismic information and acoustic logging information is firstly built,then the system characteristics of seismic wave absorption for stratum are estimated by system discrimination technique so as to have the compensative high frequency recovery of surface seismic data.The processing results of different resolutions from forward modeling data and actual surface seismic data are shown that in the condition of the same main characteristics of original seismic data,the technique can improve greatly the seismic data vertical resolution,especially,10~20Hz of the dominant frequency band can be improved,and 10Hz of frequency band can be developed.