Abstract
The regular working method for well log correlation in the Neogene-Quaternary infill of the Croatian Pannonian Basin is based on visual identification of specific motifs that can be observed regionally through the sub-basins or depressions. This method is proven successful through exploration for petroleum accumulations in the aforementioned area but its application is limited outside of the interval of the Upper Miocene sediments and has proven to be subjective. Standard deviation values of well log data from conventional well logs (spontaneous potential, shallow and deep resistivity) were calculated and observed over the entire Neogene-Quaternary well interval for defining new correlation markers which correspond to the old well log marker horizons. Traditionally determined marker horizons did not coincide with those defined by the standard deviation technique. However, new regional horizons were established in the youngest part of the infill, which made more detailed correlation now possible.
Highlights
Subsurface settings and stratigraphic relations of the Croatian part of the Pannonian Basin (CPBS) have traditionally been di vided into formations and members based on research that is on going from the 1950s
The first part of the analysis concerned the entire Neogene-Quaternary infill where regional well log marker horizons were plotted against calculated curves
Observing trends and break points in CSTDEV and CST DEV_R2 curves did not show relationships with existing well log marker horizons, which makes their applicability in the Upper Miocene sediments questionable
Summary
Subsurface settings and stratigraphic relations of the Croatian part of the Pannonian Basin (CPBS) have traditionally been di vided into formations and members based on research that is on going from the 1950s. These strata are generally divided by well log marker horizons, which represent distinctive motifs that can be observed on well log curves, on the resisti vity curves in thick-bedded marls (VRBANAC, 2002). Geologia Croatica to regionally correlate deposits in the subsurface For this pur pose, a mathematical approach using cumulative standard devia tion curves was tested on well data from the Neogene – Quater nary infill part of the Sava Depression, and Pannonian Basin (Fig. 1). Testing was performed initially on the entire Neogene – Qua ternary sediments and later focused on the youngest part – the Pliocene, Pleistocene and Holocene
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
