Interpolation, 3D Regridding
Spectrum offers various options for both manipulation of navigation parameters and effective data interpolation techniques. With significant experience of various vintages from surveys around the world, these techniques have been refined to cope with a wide range of technical requirements.
2D InterpolationInterpolation can be achieved pre or post stack using a number of different techniques including FX, FK or linear interpolation.
Pre-stack interpolation is used to assist with multiple attenuation where spatial aliasing occurs on the far traces of CMP gathers due to large trace to trace distances. Shots are interpolated in the common receiver domain which gives a CMP gather with double fold and halved trace to trace spacing. The interpolated traces can be discarded following multiple removal.
Post-stack interpolation can reduce the CMP spacing in the cross line direction prior to 3D migration.
RegriddingOur software can also be used to resample and map from one grid system to another, to allow merging of 3D data volumes acquired on different grids. Regridding methods work on a time-slice by time-slice basis where the time increment equals the sample interval and can also be used for post stack interpolation of a 3D survey.
3D InterpolationInterpolation of an arbitrary line from a 3D survey is possible using the linear interpolation method. Interpolation is achieved along the top two dominant dip directions. These are measured by finding maximum coherency along a range of dips from neighbouring traces. The turning points for the arbitrary line are specified in terms of inlines and bins.
