engleski

Applications of different mapping methods for sandstone distribution in south‐eastern part of Sava Depression

Sava Depression represents the south‐western margin of the Croatian part of the Pannonian Basin System. Evolution of the Sava Depression began in Miocene. Its development continued during the whole Miocene, Pliocene and finally Quaternary. Most of the hydrocarbon prone sandstones were sedimented during Late Pannonian and Early Pontian. During that time sedimentation was represented with considerable environmental changes where turbiditic currents mechanisms dominated. The studied area belongs to the southeastern part of the Sava Depression and includes several oil and gas fields. Effective thickness of the sandstones members within Kloštar Ivanić Formation (approximate Early Pontian age) are derived from the 97 exploration wells. Data represent effective thickness of Poljana sandstones(analysed interval between petrophysical markers Rni‐ Z) and Bregi sandstones (analysed interval between petrophysical markers Rfi –Delta). The applied mapping methods are Convergent Interpolations, Moving Average and Ordinary Kriging made by Petrel software. On maps interpolated with Moving Average and Ordinary Kriging almost concentric areas can be observed ‐ so‐called Bull's eye effect. Convergent Interpolation method gave a better estimate than other two methods and more realistic sandstone distribution maps. It is selected as the most appropriate method for mapping these set of data point.

Convergent interpolation; Moving Average; Ordinary Kriging; sandstones; Sava

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