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TitreA geostatistical approach for two-dimensional seismic velocity modelling
AuteurClaprood, M; Duchesne, M J; Gloaguen, E
SourceCommission géologique du Canada, Dossier public 7045, 2011, 21 pages,
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique
Sujetsgéostatistiques; vitesse des ondes sismiques; sismo-sondages; modèles; établissement de modèles; modèles sismiques; géomathématique; géophysique
Illustrationsplots; profiles; location maps
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
ProgrammeBassin sédimentaire Sverdrup, GEM : La géocartographie de l'énergie et des minéraux
Diffusé2011 11 28
Résumé(disponible en anglais seulement)
This study tests two geostatistical approaches, kriging with external drift (KED) and cokriging (CK), for building two-dimensional seismic velocity models for the reprocessing of vintage seismic reflection data collected in Canadian Western Arctic Islands between the late 1960s and the early 1980s. The interval thickness between horizons is estimated at all Common Mid Points (CMPs). The interval thickness evaluated at three well is used as the primary variable of kriging and the timethickness estimated from seismic horizon picking at all CMPs is used as the external drift to represent time-depth variations along the seismic line. The depth to horizons estimated by KED honours perfectly the depth evaluated at three wells, while the lateral variations of the horizons in depth closely follow those of the horizons picked in time-depth. In contrast to constant lateral velocity layer models often used in seismic processing, the velocity calculated from the KED allow modelling lateral velocity variations within each layers, providing a more realistic representation of the subsurface geology.