engleski

Application of geomathematics in description of turbiditic depositional environments, case study Kloštar Field, Sava Depression

Geological variables of reservoirs sandstone series were analyzed in the Kloštar Field, which is located W of Moslavačka gora Mt., but also SE from Kalnik Mt. Goal was possible observation of material source changing during Late Pannonian and Early Pontian. Accepted clastic source during both periods were Eastern Alps, and material had been several times redeposited until reached the western part of the Sava Depression. However, palaeogeographic analysis open possibility that Moslavačka gora Mt. had some influence as a secondary source of clastics in Late Pannonian, which had been transported probably in short alluvial fans. That would be proof that the local palaeorelief had also role as sources of clastics around the Kloštar structure, but also in other places in the Sava Depression close to uplifted palaeorelief. Depth, thickness and porosity simulations were performed for the largest Late Pannonian and Early Pontian reservoirs. Lithology is similar, but the Late Pannonian sandstones are more compact, also characterised by more mica minerals. According to VRBANAC et al. (2010) there were two phases turbiditic activities. In the first, detritus was transported from NW, but later in the second direction of transport shifted from N, and locally even from N/NE. The main turbidite currents came from N/NW passed between Kalnik and Moslavačka gora Mts., almost directly toward Kloštar structure on the S. Simulations Gaussian maps showed such trend for Early Pontian in a direction of equal cell values.

geomathematics; Late Pannonian; Early Pontian; turbidites; Sava Depression; Croatia

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