Representation of Depth‐contour Maps of Arbitrarily Curved Reflection Horizons, Including Refraction of Rays, Three‐dimensional Case*

A method of constructing depth contour maps of arbitrarily curved horizons obtained from seismic reflection surveys is discussed. This method takes into account three dimensional refraction, avoiding the construction of seismic cross sections of any kind. It requires little work even if refraction at several horizons is taken into account. The multiple layer problem is traced back to the single layer case. Discontinuities in velocity are also taken into account.