“两宽一高”三维地震资料的纵向分辨率探讨及应用

为了探讨宽频地震资料的纵向分辨率问题，依托2015年吐哈油田葡北“两宽一高”三维地震处理数据，通过分析合成地震记录、倍频程滤波和不同频带的地震反演结果，认为：不同频带的地震反射代表了对不同尺度地层界面的分辨能力，在低频段只能分辨大套地层的界面，在高频段既能分辨大套地层又能分辨较薄地层的界面，地震资料低频成分的缺失使地震反射的层次感降低；当地震资料缺失低频成分越多，用井插值模型补偿低频的波阻抗反演与实际宽频地震反演结果差别越大，即地震资料的低频决定反演精度，高频决定反演分辨率。通过吐哈油田葡北三维地震的宽频反演，储层预测精度明显提高，有效指导了该区岩性油气藏的勘探。

Vertical resolution of broadband,wide-azimuth and high-density seismic data

We discuss in this paper the vertical resolution of broadband,wide-azimuth and high-density (BWH) seismic data acquired in 2015 in Pubei Oilfield,Tuha Basin.With synthetic seismogram,filtering in an octave,and inversion,it is found that different-band reflections present different resolutions of strata interface in different scales.Lower-frequency seismic data resolution can identify large-scale interfaces,and high-frequency seismic data resolution can identify both large-scale and small-scale interfaces.When seismic data lasts low-frequency information,fewer interfaces could be identified.Low frequency of seismic data determines seismic inversion accuracy,and high frequency of seismic data decides seismic inversion resolution.Reservoir prediction based on BWH seismic data is significantly improved by broadband seismic inversion,and effectively guided lithologic reservoirs exploration in Tuha Basin.