Naslov
Review of geostatistical analyses performed In Croatian part of Pannonian basin (porosity data)

Autori
Malvić, Tomislav ; Balić, Davorin

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

Izvornik
Abstracts of the XIII. Congress of Hungarian Geomathematics and the II. Congress of Croatian and Hungarian Geomathematics Applications of Geostatistics, GIS and Remote Sensing in the Fields of Geosciences and Environmental Protection / Geiger, Janos - Mórahalom : Hungarian geological society, Geomathematical section, 2009, 8-9

Skup
Congress of Hungarian Geomathematics (13 ; 2009) ; Congress of Croatian and Hungarian Geomathematics (2 ; 2009)

Mjesto i datum
Mórahalom, Mađarska, 21.05.2009. - 23.05.2009

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
geostatistics; porosity; Croatia; Sava depression; Drava depression; Pannonian basin

Sažetak
Geostatistical methods of interpolation are the most appropriate for almost all porosity interpolations in all lithostratigraphic units in Croatian part of Pannonian basin. Of course, the number of inputs need to be enough large for application of mathematical method of interpolation, what means approximately 10 or more values. The first extensive variogram analyses are calculated in the Bjelovar subdepression, but only for core porosity values in vertical direction. The maps are not interpolated, just variogram parameters (range, sill, nugget) had been calculated for Pepelana and Poljana sandstones (Pontian age), Mosti member (Badenian age) and carbonate basement (Mesozoic age). In the western part of the Drava depression (Stari Gradac, Kalinovac, Molve fields) porosity was interpolated in reservoirs of very heterogeneous lithology. In the eastern part of Drava depression (Beničanci field) porosity was estimated using also seismic attribute as the secondary variable in the breccia reservoir of Badenian age. In the Sava depression all geostatistical analyses had been done in sandstones of Pontian and Pannonian ages. The first experimental work is done at the Voloder field, but very applicable and extensive analyses are performed at the Kloštar and especially Ivanić fields. The kriging is definitely confirmed as the best interpolation approach for sandstone reservoirs in the Sava (and the Drava) depression. The applicability of experimental variogram calculations for analysis of porosity data measured in cores was tested at values from Miocene and Mesozoic rocks from the Bjelovar subdepression. It is accepted as valuable tool for determination of spatial dependence in vertical direction, especially of Miocene strata. The primary goal was the modelling of porosity, as one of the most important and descriptive variable for reservoir description. But, many of achieved results had been easily transformed for other geological variable like thickness, depth and permeability. Especially this is valid for sandstone lithology, where the most appropriate geostatistical methods for describing of this lithology can be used for interpolation of other mentioned geological variables.

Izvorni jezik
Engleski

Znanstvena područja
Matematika, Geologija

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