Velocity-independent estimation of kinematic attributes in vertical transverse isotropy media using local slopes and predictive painting

• DOI: 10.1190/geo2015-0638.1
• Publication Date: 2016-08-11T11:43:22Z
• Authors: M. Javad Khoshnavaz; Andrej Bóna; Milovan Urosevic
• Keywords: Transverse isotropy

Agood seismic velocity model is required for many routine imaging techniques. Velocity building from data often labor intensive and time consuming. The process becomes more complicated by taking nonhyperbolic traveltime estimations into account. An alternative to the conventional time-domain algorithms use techniques based on local event slopes, which contain sufficient information about moveout estimation characterization of subsurface geologic structures. Given there no need a prior knowledge model. That why term “velocity independent” commonly used such We improved upon simplified previous versions velocity-independent approximations horizontally layered vertical transverse isotropy (VTI) media removing one order differentiation with respect offset kinematic attributes. These attributes are derived in terms slopes zero-offset two-way (TWTT). proposed predictive painting, keeps all curvature independent, estimate TWTT. theoretical contents performance approach were evaluated synthetic field examples. also studied accuracy shifted hyperbola, rational, three-parameter, acceleration example. Our results show that regardless approximation types, NMO has higher than nonhyperbolicity attribute. Computational inversion VTI using our compared routine/conventional multiparameter semblance