薄层多波AVO效应研究

ＡＶＯ效应反映了地震反射振幅随炮检距变化的特征。在一定条件下，利用ＡＶＯ效应可以预测出储层参数并识别油气异常。然而，引起ＡＶＯ效应的原因是多方面的，很难唯一地确定储层参数或判断油气的存在。多波ＡＶＯ效应的研究有利于解决这种检测结果的多解性问题，尤其对薄储层，这项研究更有意义。本文选择含气和不含气的薄储层模型，利用完全形式的Ｚｏｅｐｐｒｉｔｚ方程，进行多波ＡＶＯ效应的研究。认为对Ｐ－Ｐ波而言，不论薄

Multiwave AVO effect relating to thin layers

AVO effect indicates how seismic reflection amplitude varys with offset. Under certain condition, AVO effect can be used to predict reservoir parameters andhydrocarbon anomaly. However, AVO effect hardly reflects solely reservoir parameters and hydr0carbon anomaly because it may resu1t from many factors. The analysis of multiwave AVO effect avoid the multiple solution of prediction result, whichis particularly reliable in thin reserv0ir condition. The research on multiwave AVOeffect has been made by adopting full Zoeppritz's equation and models of thin reservoirs which have gas and no gas. The research shows that the AVO effect of P-Pwave follows tuning principle whether the thin reservoir has water or gas, and thatP-SV and S-S waves all exhibit obvious AVO phenomenon whether the thin reservoir has gas or not.