地震各向异性流体检测技术在胜利油田垦71井区的应用(英文)

Application of seismic anisotropy fluid detection technology in the Ken 71 well block of Shengli Oilfield

根据Chapman理论模型,在各向异性介质(如HTI介质)中,当入射角在0-45。范围内,慢横波会发生较大的衰减和频散,且对流体粘度敏感,而P波和快横波则比较小。对于沿裂隙法向传播的慢横波,其振幅受流体影响很大。因此,在P波响应对流体不敏感的情况下,可利用慢横波来获得裂隙型油气藏的流体信息。本文分析了胜利油田垦71地区三维三分量地震数据,检测出的慢横波振幅和旅行时异常与该区的测井资料十分吻合。分析结果还发现,与含油区相比,含水区会产生更高的横波分裂。在含水区,慢横波振幅会产生明显变化,而在含油区则几乎没有变化。

On the basis of Chapman＇s（2003） model,as the seismic wave incidences angles vary from 0° to 45° while propagating in anisotropic media（HTI）,the slow S-wave will sufferred by serious attenuation and dispersion and is sensitive to fluid viscosity but the P-and fast S-waves don＇t.For slow S waves propagating normal to fractures,the amplitudes are strongly affected by pore fluid.So,the slow S-wave can be used to detect fractured reservoir fluid information when the P-wave response is insensitive to the fluid.In this paper,3D3C seismic data from the Ken 71 area of Shengli Oilfield are processed and analyzed.The travel time and amplitude anomalies of slow S-waves are detected and correlated with well log data.The S-wave splitting in a water-bearing zone is higher than in an oil-bearing zone.Thus,the slow S-wave amplitude change is more significant in water-bearing zones than in oil-bearing zones.