基于AVO正演模型的相干拟合多次波压制技术及其应用

AVO-forward-model-based multiple suppression technique of coherent fitting and its applications

针对严重影响海上油田中深层成像的多次波问题,提出了基于AVO正演模型的相干拟合多次波压制技术。通过AVO正演技术把地震数据分解成主要有效波和主要多次波成分,并对多次波进行信号倾角扫描相干模拟消除,然后利用数据重构技术来重建有效信号。应用效果表明,该项技术的计算时间较常用方法大大缩短,压制多次波的效果较为理想,而且有效地克服了常规多次波压制技术由于组合效应造成多次波残留的影响,保证了地震数据相对振幅的可靠性。

For the serious problem that seismic imagines of middle to deep intervals are influenced by multiple reflections in offshore oilfields, a technique of coherent fitting multiple suppression based on AVO forward models has been developed. In applying this technique, seismic data is divided into the main effective wave and the main multiple components by using AVO forward modeling, and the latter can be eliminated by dip scanning and coherent simulation of the signals. Then the effective signals will be rebuilt using a method of data reconstruction. The application results show that this technique is greatly shorter in calculation time and more satisfactory in multiple suppression effects than the conventional techniques, and can effectively avoid residual multiple reflections due to combination effects when applying the conventional techniques of multiple suppression, ensuring the reliability of seismic relative amplitudes.