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Abstract

Two potential source rock zones occur within the Neogene sedimentary fill of the Pannonian basin. These units may be up to one kilometer thick, but the average organic carbon content is relatively low (0.5-1.5010). The upper zone (in the upper part of the lower Pannonian, s. l.) has just entered the oil generation window, but the lower zone (in middle Miocene to lower Pannonian rocks) passed into the oil generation window at around 8 Ma, and in the deepest parts of the basin it is already overmature. This second zone is significantly overpressured, and is estimated to have become overpressured initially at about 8 Ma. Combining maturation histories with coeval estimated pore pressures in the Makó-Hódmezővásárhely trough indicate that within this deeper zone of potential source rocks: (1) migration out of the upper part of the source rock zone was upwards and laterally, while (2) migration out of the middle and lower parts of this zone was probably downwards out of the source rocks and then laterally within more permeable rocks below.

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