三维VSP振幅比与频率比求取研究
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摘要
P波与SV波的振幅比剖面不仅直接反映了纵波与转换横波之间的振幅大小与相位关系,而且反映了地下介质的物性参数,可帮助判断地层间关系和岩性,有助于进一步提高岩性解释的准确性;同时,利用振幅比剖面还可以更清楚地解释地层间的几何接触关系。因此,振幅比与频率比在辅助地震资料解释方面有着重要意义。介绍了波形压缩与拾取同相轴2种不同方法,并利用拾取同相轴法计算P波与SV波振幅比与频率比,分析了振幅比与频率比异常,并给出了相应的地质解释。研究表明,三维VSP振幅比与频率比的求取有助于提高地震资料解释准确性,特别对辅助找油气藏有着重要意义。
P wave and SV amplitude ratio profile can not only directly reflect amplitude in the size and phase relationship for longitudinal wave and the converted shear wave,but also reflect the physical parameters of underground media,it can help us determine the relationship of the strat and lithology,and to further improve the accuracy of lithology interpretation;At the same time,using the amplitude ratio profile can explain more clearly the geometric contact relationship between the strata.It introduces two different ways of compressing waveform and picking up phase axis,and makes use of picking up phase axis to compute the amplitude ratio and frequency ratio of P wave and SV wave.Analysis of exceptions of amplitude ratio and frequency ratio,and discuss the geological interpretation of the related exception of amplitude ratio.
P wave and SV amplitude ratio profile can not only directly reflect amplitude in the size and phase relationship for longitudinal wave and the converted shear wave,but also reflect the physical parameters of underground media,it can help us determine the relationship of the strat and lithology,and to further improve the accuracy of lithology interpretation;At the same time,using the amplitude ratio profile can explain more clearly the geometric contact relationship between the strata.It introduces two different ways of compressing waveform and picking up phase axis,and makes use of picking up phase axis to compute the amplitude ratio and frequency ratio of P wave and SV wave.Analysis of exceptions of amplitude ratio and frequency ratio,and discuss the geological interpretation of the related exception of amplitude ratio.
引文
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[3]王建民,杨冬,魏修成,等.多分量地震资料预测松辽盆地兴城地区深层火山岩与有利含气带[J].地球物理学报,2007,50(6):1914～1921.
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[2]高如曾.多层振幅比法的应用[J].石油地球物理勘探,1982,2(3):48～52.
[3]王建民,杨冬,魏修成,等.多分量地震资料预测松辽盆地兴城地区深层火山岩与有利含气带[J].地球物理学报,2007,50(6):1914～1921.
[4]高如曾.振幅比法直接找气的尝试和效果[J].石油地球物理勘探,1980,1(1):36～50.
[5]宁书年,吴志勤,王赟,等.叠前Kirchhoff积分偏移法纵横波振幅比剖面的拾取与应用[J].中国矿业大学学报,2004,33(5):495～497.
[6]Winkler K,Nur A.Pore fluids and seismic attenuationin rocks Geoph[J].Res Lett,1979,6(2):51～54
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