基追踪反演在宽频带地震数据中的应用

Application of base pursuit inversion on wide-band seismic data

基追踪反演能在一定程度上提高纵向分辨率,这种作用能否在高分辨的宽频带资料中得到凸显。针对这一问题,首先从模拟信号上进行了比较分析;随后针对DF地区两套不同带宽的地震资料进行了基追踪反演,比较了反演结果与实际井曲线的吻合情况。从模拟结果发现,宽频带资料在基追踪反演过程中受旁瓣影响小,反演后不会出现虚假同相轴。实际资料反演结果显示,反演剖面分辨率较高,与井曲线更加吻合。另外,由于宽频带地震数据中薄层的调谐作用减弱,基追踪反演结果容易反演出弱反射界面。

To some extent,basic pursuit(BP)inversion can improve vertical resolution.However,if this function can be strengthened when we make BP inversion on wide-band data is uncertain.To address this question,we first analyze on numerical simulation,and then make BP inversion on two different wide-band data in DF area and compare the inversion results with the logging curves.From numerical simulation,it can be seen that the influence from side lobe is little and no illusive event appears when we make BP inversion on wide-band data.Results from real data show that the inversion sections have high resolution and consistence with logging curve.Furthermore,owing to weak tuning from thin bed,weak reflection interface can be inversed easily by BP inversion.