engleski

Lithofacies definition based on cut-offs in Indicator Kriging mapping, case study Lower Pontian reservoir, Sava Depression

Mapping of the lithofacies is very important for getting insight to sedimentary environments, shapes and boundaries of hydrocarbon reservoirs especially in reservoir characterization. Indicator Kriging technique is most often used for lithofacies mapping. It is based on indicator transformed input data, depending on presence or absence of the certain lithofacies. Indicator transformation of the input data is performed based on cut-offs into values 0 or 1. Turbidites were dominant clastic transport mechanism in the Croatian part of the Pannonian Basin System during the Early Pontian. Most of transported detritus had been eroded in the Eastern Alps and re-deposited several times before the suspended materials entered the Sava Depression. Due to long transport only medium and fine grained sands and silts (Tb - Td Bouma sequences) reached the Sava Depression. When turbiditic currents were not active, marl, as a typical calm deep water sediment was deposited. In this paper it was presented how to use core and log data to define proper cut-offs for describing different lithofacies. Obtained results are probability maps and with a proper cut-offs definition some of them can show turbiditic channel and material transport direction.

Lithofacies definition; Indicator Kriging; Neogene; Sava Depression; Croatia

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