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Veeken P.C.H.,Wintershall Holding | Korotkov I.,GDS | Kozyrev V.,GDS
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

Static correction computation is an important step in the seismic processing of land and transition zone data. Complex near-surface overburden velocity changes do hamper proper imaging. Geological and physical features (like: permafrost, pinch outs, swamps, sand dunes etc) may introduce irregular travel time delays. Automatic residual static algorithms sometimes fail to resolve these static corrections and thus may give rise to serious mis-interpretation of the subsurface structuration. Costly dry holes have been drilled based on false tectonic structures visible on non-optimal processed seismic data. These errors can be overcome by introducing an interpretation / modeling phase in the determination of the static corrections, using receiver and shot partial-offset stacks. The Interactive Static computation method uses diagnostic partial stacks in various domains to distinguish anomalies caused by drastic lateral velocity change in the shallow subsurface. Case studies illustrate the benefit of such a static correction method. © 2010, European Association of Geoscientists and Engineers.


Adamovich O.,GDS | Epov K.,GDS | Korotkov I.,GDS | Veeken P.C.H.,Geops
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

A finite difference modeling study has been done to evaluate the effect of acquisition/processing parameters on quality of seismic land data. Data from a field in southeastern Siberia were used to construct a subsurface model. The workflow included several steps: elastic model building, 1D forward modeling, 2D finite-differences modeling, elastic inversion, receiver array analysis, synthetic data processing and interprelation. The effects of time sampling and grid size step on the noise level were examined. Comparison was made with the matrix propagator results. In perfect near surface conditions the use of receiver arrays may help to attenuate coherent noise. © 2010, European Association of Geoscientists and Engineers.

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