engleski

Subsurface modelling of the Neogene-Quaternary sediments in part of the Sava Depression based on digitalization of legacy map data

The aim of research was the accurate digitalization and subsurface modelling of the legacy data, namely paper-based geological maps. The research area covers approximately 1053 km2 and is located in the Croatian part of the Pannonian Basin System, the Sava Depression, i.e. in the region of the Stružec Oil Field. Data input for the structural analysis were structural maps which were previously made in the 1980. The set included five structural maps based on regional E-log markers and one map of pre-Neogene surface. All were digitalized in the ArcGIS program, and later modelled in Petrel. Structural contours and a total of 134 faults were exported into Petrel software where they were further processed and regrouped. From such digitalized and processed data, the geological model (geomodel) was made using complex fault framework. The study concerned the advantages and errors that occur during the creation of such a geomodel. It clearly displays the relationships between major and minor faults and fault slips, geological structures and structural traps in 3D (e.g. anticline of the Stružec Field). Another advantage is the multicolored presentation of depths and faults, which facilitates the recognition of geological structures and potential traps for hydrocarbons. Errors and issues can occur during the digitalization of contour lines, the selection of the appropriate algorithm and later, after the model has already been created. A low error rate between the two approaches indicates the accuracy of digitalization of data and subsurface modelling. Uncertainty models (maps of statistical percentage deviation) were made in the Petrel Software for the display of the deviation between handmade maps and Petrel models for each E-log marker and one pre- Neogene top.

Stružec Field ; Sava Depression ; subsurface modelling ; digitalization

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