Naslov
Ordinary Kriging as the most Appropriate Interpolation Method for Porosity in the Sava Depression Neogene Sandstone

Autori
Balić, Davorin ; Malvić, Tomislav

Izvornik
Naftaplin : znanstveno-stručno glasilo Hrvatske udruge naftnih inženjera i geologa (1330-2434) 30 (2010), 3; 81-90

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Ordinary Kriging; Simple Kriging; porosity; sandstones; Sava depression; Neogene

Sažetak
Porosity can be mapped by many computer-based interpolated methods. All of them are defined by less and more advanced mathematical equations. There is several works performed on data from the Sava depression that tested appropriation of several such mapping methods, available in almost all computer mapping software packages. Mathematically simpler methods are quicker, but often less precise in cases based on smaller input dataset (approximately 10-15 hard data or lesser). There is another option to use geostatistical deterministical methods like kriging. In kriging methods the most often and very suitable is the Ordinary kriging technique, developed from equations of the Simple Kriging as the basic kriging approach. It can be proven, using matrix equations, that kriging variance (as the measure of error) is decreased in the Ordinary than in the Simple Kriging. The presented analysis was directed in the porosity dataset as the observed input derived from the reservoir. Three simpler methods had been tested (Inverse Distance, Nearest Neighborhood, Moving Average) to obtain porosity maps. Furthermore is proven that variance minimizing in better in the Ordinary Kriging than in the Simple Kriging. Finally, the map interpolated by the Ordinary Kriging and belonging numerical result had been point out as the most appropriate tool (and the interpolation technique) that could be applied for porosity distribution description in reservoir sandstones of Neogene age (from Early Pannonian to Early Pontian). Due to lithological, depositional and tectonic properties similarities in all hydrocarbon reservoirs located in the Sava depression, presented result and given recommendations can be applied for entire depression.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

Napomena
Rad je objavljen u posebnom broju časopisa Naftaplin koji je Zbornik radova s 5. međunarodnog znanstvenog-stručnog skupa o naftnom rudarstvu (knjiga 57/10).

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