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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。
According to Chapman’s theoretical model, in anisotropic media (such as HTI media), when the incident angle is 0-45. Within the range, the slow shear wave will occur greater attenuation and dispersion, and the viscosity of the fluid sensitive, while the P wave and fast shear wave is relatively small. For slow shear waves propagating in the normal direction of the fracture, the amplitude is strongly influenced by the fluid. Therefore, the slow shear wave can be used to obtain the fluid information of fractured reservoirs when the P wave response is not sensitive to the fluid. This paper analyzes the three-dimensional three-component seismic data of Ken 71 in Shengli Oilfield. The detected amplitude of slow shear wave and the anomaly of travel coincide well with the logging data in this area. The analysis also found that water-bearing zones produce higher shear-wave splitting than oil-bearing zones. In aquifers, the amplitude of slow shear waves varies significantly, while there is almost no change in oil-bearing areas.