井间地震资料时间域波阻抗反演研究

Research on impedance inversion of cross-hole seismic data in time domain

常用的时间域反演方法不能直接用于深度域的井间地震资料。通过建立合适的深时转换速度模型,将井间地震资料从深度域转换到时间域。应用时间域地震波阻抗反演方法对其进行反演处理,再将其转换回深度域进行储层解释。在此基础上建立了井间地震资料波阻抗约束模型,对时间域的波阻抗剖面进行时深转换,得到深度域的井间地震波阻抗剖面。转换后的深度波阻抗剖面及深度域井资料可直接用于储层的对比分析。实例分析表明,利用该方法得到的反演结果精度高,储层描述效果好。

The conventional inversion for time domain is unfavorable to cross-hole seismic data in depth domain. An appropriate velocity model for depth-time conversion was constructed. The data can be converted from depth domain to time domain. The inversion result obtained in the time domain can be converted back to depth domain for reservoir interpretation. The constraint model for wave impedance of cross-hole seismic data was developed. The depth-time conversion of wave impedance profile in the time domain was made, and the wave impedance profile of cross-hole seismic data in the depth domain was obtained. The converted wave impedance profile and the seismic data in depth domain can be directly used to analyze reservoir property.