薄层多波AVO效应研究
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摘要
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，不论薄层含水与含气，AVO效应均遵循调谐原理；对P－SV波和S－S波而言，不论薄层是否含气，都有明显的AVO特征。
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.
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.
引文
1Aki K, Richards P G著,李钦祖等译.定量地震学──理论与方法,第 1卷,地震出版社,1986
2 Shuey R T.A simplication of the Zoeppfitz equations,Geophysics,1985,50(5):609～634
3孙忠勤.振幅与炮检距关系的研究──地震岩性学的一种新方法,石油物探专题情报成果集(第4集),1987
4 Ostrander W J. Plane-wave reflection coefficients for gas and sands at nonnormala angles of incidence,Geophysics, 1984,49(10):1637～1648
2 Shuey R T.A simplication of the Zoeppfitz equations,Geophysics,1985,50(5):609～634
3孙忠勤.振幅与炮检距关系的研究──地震岩性学的一种新方法,石油物探专题情报成果集(第4集),1987
4 Ostrander W J. Plane-wave reflection coefficients for gas and sands at nonnormala angles of incidence,Geophysics, 1984,49(10):1637～1648
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