Flatten and balance

Flatten and balance

PreStack Pro has all the tools needed to flatten gathers, balance frequencies, and scale amplitudes using well data.

You’ll like the results.

Most seismic data are processed to optimize image quality. After standard processing, residual moveout, wavelet stretch, and transmission losses may be obvious on gathers.

If they aren’t corrected, AVO reliability and pre-stack inversion results will suffer.

Gather flattening

PreStack Pro can apply automatic, continuous velocity picking to raw migrated gathers, or correct for residual moveout that remains after final processing.

Large velocity errors can be corrected using semblance-based RMO (2nd and 4th-order), which perturbs input velocity data and outputs gathers and updated velocities/ETAs. Gather alignment can be further improved by estimating and applying time-variant 3D time shifts that maximize cross-correlation in the offset direction.

Both methods incorporate inline/crossline filtering of the time shifts or updated velocity fields, to ensure spatial consistency of the flattened gathers

Frequency and amplitude balancing

Even after careful “true-amplitude” processing, real gathers may require additional amplitude and frequency balancing in order to match the AVO response predicted from wells.

Spectral balancing matches the frequency distribution across offsets and minimizes NMO stretch, while still preserving the AVO amplitude trend.

Our offset-dependent scaling tools construct simple, offset-dependent gaining functions by calibrating AVO response to trends predicted from synthetic gathers.