Instantaneous Isochrons, Volume-flattening and a High Resolution View of Sedimentation Rate

The instantaneous isochron attribute is defined as the change in seismic time with respect to relative chronostratigraphic time. It can be computed by taking the derivative of a horizon volume used for volumetric flattening. In an example from Angola, the horizon volume is computed automatically with a global algorithm that picks every horizon in a 3D dataset. The instantaneous isochron attribute derived from this provides a dramatic view of the geomorphology of a turbidite sequence.