Because predictive decon fails on the Ricker wavelet, earlier we devised an extension to non-minimum phase wavelets (Yang et al, 2011). It showed remarkable clarity of seismogram polarity. Here we improve our method by a log spectral parameterization. Another innovation here is correctly handling time-variable gain. Since filtering does not commute with TV gain, gain is now done after decon (no...

Historical seismograms contain a rich harvest of information useful for the study of past earthquakes. It is necessary to extract this information by digitising the analog records if modern analysis is required. Teseo has been developed for quick and accurate digitisation of seismogram traces from raster files, introducing a vectorisation step based on piecewise cubic Bézier curves. The vectori...

The 2D seismic reflection data were used to study the structure of Shurau and Sheikh Alas formations (Oligocene) in Ismail area, northern Iraq. horizons reflectors identified based on well logs through a synthetic seismogram construction. Two-Way Time, velocity depth maps two coinciding obtained. A Great coincidence was noticed between identical formations. Main closure (syncline) trending NE-S...