Method for tomographically laterally varying seismic data velocity estimation

摘要

A process for tomographic development of seismic section data having known source and receiver positions. The process employs forward modeling to estimate travel times of the rays through the earth medium. The medium is assigned a cellular constitution and ray tracking proceeds through individual cell analysis within a two dimensional neighborhood to join a series of individual cell velocity values, e.g. the velocity values at the cell corners. Ray tracing proceeds utilizing derived expressions for position, orientation, and travel time of the ray in the cell as a function of cell dimensions, initial ray position, ray orientation, and the neighborhood velocity values. A travel time equation is then derived and used to construct a model parameter estimation and finalized estimated data output.