Method and device for wave fields separation in seismic data

摘要

Apparatus, computer instructions and method for processing seismic data related to a subsurface of a body of water. The method includes receiving input data for a vertical direction and radial direction and/or from a hydrophone, applying a radon transform to the input data, separating primary signals from ghosts signals based on the vertical and radial components, applying an inverse radon transform to determine up-going and down-going wave fields in a time-distance domain, and separating interfering up-going and down-going wave fields that are recorded by the same receivers.

主权项

1. A method for ZX separating up-going and down-going wave fields in seismic data related to a subsurface of a body of water, the method comprising:
receiving as input vertical and radial components, wherein the vertical component is related to a particle velocity measured along a depth direction relative to a surface of the water and the radial component is related to the particle velocity measured along a radial direction parallel to the surface of the water and substantially perpendicular to the depth direction and the radial direction and the vertical direction define a plane in which the wave fields propagate; applying a radon transform to the vertical and radial components to transform the vertical and radial components from a time-distance domain to a tau-apparent slowness domain, wherein the apparent slowness is the sine of an incidence angle divided by a speed of the wave fields in water; calculating the up-going wave fields as a first combination of the radon transformed vertical and radial components multiplied by a scaling factor; calculating the down-going wave fields as a second combination of the radon transformed vertical and radial components multiplied by the scaling factor; and applying an inverse radon transform to the up-going wave fields and the down-going wave fields to obtain up-going wave fields and down-going wave fields in the time-distance domain.