正常时差

转换波上、下行波的不对称性，使得常规的基于共中心点（CMP）道集的速度分析、正常时差校正和共中心点叠加技术不能适用于转换波。

Because of the ray asymmetry of the downgoing and upgoing waves , the velocity analysis , NMO correction and CMP stacking based on the CMP gather cannot be adapted to that of the converted wave ( CCP ) .

快速计算正常时差的新算法

A new algorithm for fast NMO calculation

HTI介质横波正常时差速度反演

Estimation of normal moveout velocity of S-wave in horizontal transverse isotropic ( hti ) media

转换波共转换点叠加的关键在于CCP抽道集、非双曲线正常时差校正及基于非双曲线时距方程的转换波速度分析。

Common conversion point ( CCP ) binning 、 non-hyperbolic normal moveout ( NMO ) and converted-wave velocity analysis based on non-hyperbolic NMO are the key points to CCP stacking for converted-wave .

比较典型的方法有预测反褶积、正常时差变换叠加、f-k变换、τ-p变换、抛物线Radon变换和聚束滤波等，它们可以简称为基于几何地震学方法或几何滤波类方法；

Typical methods of the first class consist of predictive deconvolution , normal moveout interconversion stacking , f-k transformation , tau-p transformation , parabola Radon transformation and beamforming . They can be called as seismography method based on the geometry .

针对任意各向异性程度的HTI介质水平反射界面，提出了D剖面的概念，并由此得到任意方位角（测线方向与主轴方向的夹角）的转换波正常时差（NMO）速度公式。

A double profile for describing the horizontal reflectors in HTI media with any strength of anisotropy is proposed . Moreover , the equations for normal moveout ( NMO ) velocity of P S wave in HTI medium with arbitrary symmetry and any strength of anisotropy are obtained .

众所周知，满足双曲线规律的正常时差校正公式是以各向同性、均匀介质为基础的。

It is well known that the normal moveout formula is based upon homogeneous isotropic media .