Radial refraction

{
  "id": "MLC-T-OAG-003032",
  "term": "Radial refraction",
  "field": "Oil and gas",
  "definition": "A borehole seismic technique in which a detector deep in a well records waves from sources at the surface that are placed at different azimuths around the wellhead, along lines radiating from it. The first-arrival times from the radial shots show how the velocity structure around the well changes with azimuth, as when a salt body lies to one side. It has largely been replaced by salt-proximity vertical seismic profiling and 3D surface seismic.",
  "subject": "Geophysics",
  "url": "https://mlchart.com/terminology/oil-and-gas/radial-refraction/"
}