The Characteristic of Quartic Moveout Coefficient of P‐Wave in the TI Homogeneous Media with an Arbitrary Orientation Symmetric‐Axis

Abstract

AbstractDeviations of any pure mode (non‐converted) wave reflection traveltimes from a hyperbola, called the nonhyperbolic or quartic moveout, need to be corrected properly in processing long‐spread anisotropic seismic data. Based on our exact analytic expression for the quartic moveout coefficient (A4) of pure mode (non‐converted) wave reflection on a horizontal interface in the TI media with an arbitrarily orientated symmetry axis (ATI) in space, we numerically study the characteristics of the P‐wave A4 with the CMP survey line azimuth variation. The forward modeling results show that the characteristics of the A4 are related not only to the anisotropy parameters of the TI, but also the spatial orientation of the TI. The variation characteristic of the A4 is determined by the anisotropy parameters and tilt angle of the TI symmetric‐axis, and the azimuth of the TI symmetric‐axis results in the azimuth symmetry of the A4 with the survey line variation. Our numerical results will benefit the explanation of the anisotropic seismic data and the parameter inversion.