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The Drava Depression is located in the southwestern, margin of the Pannonian Basin. The northern zone of the depression is called the deep Drava. Geochemical data imply that in the northwestern part of deep Drava, the mudstones, carbonate-fossiliferous mudstones, compact marls and siltites of Lower Miocene to Badenian age at the depths of more than 3000 m are petroleum source rocks. The organic matter...
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