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倾斜叠加可把作为震源一接收器偏移距与走时函数记录下来的地震资料变换成截距时间域和射线参数 p,因此,得到的τ-p 曲线形状与地层慢度面密切相关。τ-p 域内层剥层的运算可消除勘探层上所有地层的影响。最终曲线与地层表面慢度一致(含地层深度和倾角的比例因子则除外)。慢度面是各向异性介质的一个特征面。它可使τ-p 域适用于探测和描述各向异性层。文中推导了τ-p 曲线形态、慢度面以及地层几何形态之间的关系。用反射率法得出的合成τ-p 曲线说明了测定该曲线形状和使用剥层运算时能出现的困难。文中指出,垂向非均质性就各向异性而言,对于τ-p 曲线的影响是很小的。
Tilt stacking can transform the seismic data recorded as source-receiver offset and traveltime into intercept time domain and ray parameters p. Therefore, the shape of τ-p curve obtained is closely related to the slow plane of formation. The operation of layer delamination in the τ-p domain eliminates the effects of all formations on the exploration horizon. The final curve is consistent with the slowness of the surface (excluding the scale factor of depth and dip). Slowness surface is a characteristic surface of anisotropic medium. It makes τ-p domain suitable for detecting and describing anisotropic layers. The relationship between τ-p curve shape, slow plane and formation geometry is deduced in this paper. The resultant τ-p curve derived from the reflectance method illustrates the difficulties that can arise in determining the shape of the curve and in using the peel-off calculation. It is pointed out in the paper that the vertical heterogeneity has little effect on τ-p curve in terms of anisotropy.