川西Q地区须家河组横波预测方法研究
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摘要
准确的横波测井速度是叠前地震反演和叠前地震属性分析的必要参数,然而实际生产中往往缺乏横波速度信息。文章针对川西Q地区须家河组中低孔隙度的特点,利用实测纵横波数据拟合、Greenberg-Castagna、临界孔隙度、Krief、Xu-White等方法对横波速度进行了预测。经过综合分析,在川西Q地区,通过实测纵横波数据拟合建立的模型和Greenberg-Castagna横波预测模型效果较好。为之后的叠前地震反演和叠前地震属性分析奠定了基础。
Precise S-wave logging velocity is a necessary parameter for prestack seismic inversion and prestack seismic attribute analysis, however S-wave velocity information is always absent in the practical applications. Based on the characteristics of medium and low porosity of Xujiahe formation in XQ area, this paper uses different methods such as measured P-S wave data matching method, Greenberg-Castagna method, critical porosity method, Krief and Xu-White method to predict the velocity of S-wave. After a comprehensive analysis, the model established by the measured P-S wave data fitting method and Greenberg-Castagna method can predict the velocity of S-wave more precisely in XQ area. The precise S-wave velocity lays foundation for prestack seismic inversion and prestack seismic attribute analysis.
Precise S-wave logging velocity is a necessary parameter for prestack seismic inversion and prestack seismic attribute analysis, however S-wave velocity information is always absent in the practical applications. Based on the characteristics of medium and low porosity of Xujiahe formation in XQ area, this paper uses different methods such as measured P-S wave data matching method, Greenberg-Castagna method, critical porosity method, Krief and Xu-White method to predict the velocity of S-wave. After a comprehensive analysis, the model established by the measured P-S wave data fitting method and Greenberg-Castagna method can predict the velocity of S-wave more precisely in XQ area. The precise S-wave velocity lays foundation for prestack seismic inversion and prestack seismic attribute analysis.
引文
[1]孙福利,杨长春,麻三怀,等.横波速度预测方法[J].地球物理学进展,2008,23(2):470-474.
[2]Gary Mavko,Tapan Mukerji,Jack Dvorikin.The Rock Physics Handbook:Tools for Seismic Analysis in Porous Media[M](1).UK:Cambridge University Press,1998.
[3]马中高,解吉高.岩石的纵、横波速度与密度的规律研究[J].地球物理学进展,2005,20(4):905-910.
[4]Xu S Y,White R E.A new velocity model for clay-sand mix-ture[J].Geophysical Prospecting,1995,43(1):91-118.
[5]许士勇,马在田.快速有效的转换波共转换点叠加技术[J].地球物理学报,2002,45(4):557-568.
[2]Gary Mavko,Tapan Mukerji,Jack Dvorikin.The Rock Physics Handbook:Tools for Seismic Analysis in Porous Media[M](1).UK:Cambridge University Press,1998.
[3]马中高,解吉高.岩石的纵、横波速度与密度的规律研究[J].地球物理学进展,2005,20(4):905-910.
[4]Xu S Y,White R E.A new velocity model for clay-sand mix-ture[J].Geophysical Prospecting,1995,43(1):91-118.
[5]许士勇,马在田.快速有效的转换波共转换点叠加技术[J].地球物理学报,2002,45(4):557-568.
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