Claritas / Overview / Features / Residual Statics

GLOBE Claritas Residual Statics

Robust estimation of 2D and 3D residual statics corrections is one of the strongest features of GLOBE Claritas, and is vital for successful processing of land seismic data afflicted by the common combination of poor signal and severe statics problems.

A modified version of Ronen & Claerbout's stack-power optimisation algorithm (SPSTAT) is the most commonly used GLOBE Claritas residual statics module. It operates on shot-sorted data and incorporates a very efficient implementation and has various options to minimise the likelihood of cycle-skipping.

The shot-receiver differential statics module (SRDSTAT) also operates on shot-sorted data, and performs cross-correlations between adjacent shot or receiver gathers to produce a time-delay series from which the long-wavelength geological component is filtered out to yield the static corrections.

CDP-aligned statics may be performed with the CDPSTAT and DIPSTAT modules, the output of which may be subsequently made surface-consistent if required. Multiple cross-correlation windows may be specified within CDPSTAT, from which a mean or median shift is chosen. The pilot traces in DIPSTAT may incorporate some light slant-stacking along pre-defined dips.

Display and manipulation of static-shift files is easily accomplished with the Viewshf graphical editor. Quality-control of residual statics solutions is ideally performed with a movie-like comparison of "before and after" stacks on the workstation screen, using the XVIEW interactive display module.