利用井间地震提高地面地震资料分辨率

Using cross-hole seismic data to improve resolution of surface-seismic data

提高地面地震资料垂向分辨率一直是地震勘探的难点和热点。本文提出利用井间地震资料提高地面地震资料分辨率的一种新方法,即基于地层对地震波吸收的线性系统理论,建立关联低频地面地震与高频井间地震间多尺度地球物理信息的理论模型,再利用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实施补偿性高频恢复。应用该方法对精细地质模型不同分辨率的正演模拟资料及垦71井区实际井间及地面地震资料进行处理,结果表明在保持原地面地震资料主要特征参数的基础上,提高主频约10Hz,优势频带拓宽10～20Hz,取得了较好的地震资料优化效果。

Improving the vertical resolution of surface-seismic data is always the difficulty and hotpot of seismic exploration. The paper presented a new method improving the resolution of surface-seismic data by cross-hole seismic data,which is to create the theoretical model of multi-scale geophysical information related the low-frequency surface-seismic data to high-frequency cross-hole seismic data based on linear system theory of seismic waves absorbed by strata,then,the system feature of seismic waves absorbed by strata was assessed by using system recognition technique and the restoration for high-frequency compensation was further implemented to surface-seismic data. Using the method to carry out processing of forward simulation data with different resolution in fine geologic models and practical cross-hole seismic data and surface-seismic data in Ken-71 well zone showed that the dominant frequency was raised by about 10Hz and advantage band was broadened by 10~20Hz on the basis that retains the main characteristic parameters of original surface-seismic data,achieving better optimized results of seismic data.