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Application of Standard Deviation Trends on Well Log Data in Miocene, Pliocene and Pleistocene Sediments for Definition of Well Log Markers in Sava Depression, Pannonian Basin

Well logs from selected well within the Sava Depression, Pannonian Basin were selected for testing the applicability of standard deviation curve trends as a general outliner for sedimentation trends, well log marker position and enhancing correlation possibility. These logs consisted of classic electric well log measurements which include self potential and shallow and deep resistivity. Standard deviation trends were made on several resolution scales for each well log curve, e.g. one meter, two and four meter span for selecting the best resolution for observing trend line breaks. Constructed curves show that general trends that can be defined can be correlated between wells, especially for the youngest Pliocene-Pleistocene ones. Breaks in trend curves in some cases coincide with traditionally positioned well log markers. In addition, these breaks in some cases can be observed in seismic cross sections furthermore determining their applicability. Analysis showed the usefulness of some basic mathematics principles as a tool for division of subsurface, especially in the sedimentary environments in which traditional well log markers are not to be expected (small, dynamic basins), e.g. in Pliocene and Pleistocene sediments in Sava Depression.

standard deviation trends; well log markers; correlation; Sava Depression; Pannonian Basin

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