透射损失校正在AVO处理中的应用

The application of compensation of transmission loss in the processing of AVO

1. 同济大学,上海200092;2. 东海公司,上海200030

1. Dept. ofmarine Geology & Geophysics, Tongji University, Shanghai 200092, China;2. Donghai Oil Company, Shanghai 200030, China

从多层弹性介质理论模型出发,探讨了用加层的方式正确计算透射损失的途径。在此基础上,我们对某井的实际弹性参数应用了此方法,计算了假设介质分别为弹性情况和粘弹性情况下的透射系数,得到了关于地震波在多层介质中传播时所发生的视衰减的基本认识;最后在AVO处理中用所得到的透射系数对反射波作了透射损失校正,与常规AVO处理相比取得了明显的效果。

According to the theoreticalmodel of elasticmedia withmultiple layers of different densities and velocities, this paper presents a so called add layermethod to accurately calculate the transmission loss in strata. Transmission coefficients are calculated with themethod for the real elastic parameters in a well under the hypotheses that themedia are elastic or anelastic. From the results we can draw some conclusions about apparent attenuation of seismic waves that propagate in themulti layermedia. The transmission coefficients are then used to compensate the transmission loss of reflections during AVO(amplitude versus offset) processing. Themethod yields desired results comparing with common AVO processing.