Naslov
Using seismic inversion and seismic stratigraphy as a combined tool for understanding a small scale turbidite system: Gola field, Pannonian basin, Croatia

Autori
Vukadin, Domagoj ; Čikeš, Kristina

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
AAPG Datapages (2017) / - : AAPG, 2017

Skup
AAPG/SEG International Conference and Exhibition

Mjesto i datum
London, Ujedinjeno Kraljevstvo, 15.10.2017. - 18.10.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
seismic inversion ; seismic stratigraphy

Sažetak
Goal of the study was to identify and define small scale turbidite system of upper Miocene retrogradational depositional system in the Dravabasin, using seismic inversion and seismic stratigraphy tools, in combination with attribute analysis. The studied seismic volume covers a partof the Drava depression and includes the Gola gas field. The quality of data is crucial for interpreting geology through seismic ; therefore, methods of increasing the seismic resolution while preserving the amplitude spectrum and dominant dip were applied. Seismic- stratigraphy-based analysis greatly assists in the geological constraint or "geovalidation" of interpreted seismic stratigraphic relationships and providespotentially critical insight into stratigraphic and structural problems of nonunique interpretations (Pigott, 2010). The fact that the variability ofreflectors’ characteristics indicated lithology changes within a horizon was taken into consideration. For such small-scale turbidites, everyseismic reflector contains more than one facies not only horizontally, but also vertically oriented. Therefore, every seismic reflection and itsvariations in amplitude spectrum in the Gola gas field were interpreted as a horizon. Channels were interpreted in such a way that their relativegeological age was respected. The sequence of deposition was studied by Wheeler scenes ; depositional system was interpreted ; and thelithology was estimated and correlated with well data. Seismic facies were singled out and interpreted. Additional attributes were analysed toconfirm obtained results, such as spectral decomposition attribute, that was used to indicate changes of facies, and coherence attribute whichwas used to define the main channel flow direction and depositional infill. Results gained from these analyses, such as continuity and spatialdistribution of turbidite channels were verified by a seismic inversion (method of deriving seismic parameters, such as acoustic impedance, from reflection seismic data constrained by borehole data (e.g., Sheriff and Geldart, 1995)). Acoustic impedance inversion is applied forreservoir-quality characterization ; generally lower acoustic implies better reservoir properties, i.e., porosity. When unified, interpretationsobtained from this workflow lead to an understanding of chronostratigraphic significance of seismic-reflection correlations, and allow a moredetailed study of stratigraphic traps and small-scale turbidites.

Izvorni jezik
Engleski

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