多波AVA及岩性预测

针对多波振幅信息的研究及应用，本文介绍了一套较高精度的ＡＶＡ正演模拟方法，多波振幅特征处理方法及多波ＡＶＡ曲线直接预测岩性界面的方法。

Multiwave AVA and lithology prediction

Some accurate methods relating to AVA forward modeling,multiwave ampli-tude characteristic processing and direct lithologic interface prediction using multi-wave AVA curve are advanced in order to do good research and application of multi-wave amplitude informations.Trial computation shows that approximate AVA forward modeling is very ap-plicable to P,SV and SH-waves,and brings accurate results even when incident an-gle is 65 degrees. The multiwave amplitude characteristic processing includes AVO trace gathering, AVo-AVA conversion, AVA curve fitting and attributive section output. Zero-offset and attributive sections of non-converted multiwaves can also be produced,which have better resolution and show obvious varied characteristics. In addition,on the basis of the relation between an AVA curve and lithology interface,we develop a new method for dlrect predicting lithology interface by applying neural network to multiwave AVA curve,so that the applicability of multiwave and multi-component seismic data is raised greatly.