Abstract
There are four main rock types along the ideal rock column of the Kiskunhalas-NE field; in order from the bottom upwards, orthogneiss, orthogneiss mylonite, graphitic gneiss mylonite and graphitic carbonate phyllite. These main rock types are characterized by significantly different reservoir features, as was proved by previous rock mechanical investigation. The geophysical information of well-logs (gamma, resistivity, neutron, density and acoustic logs) allows an understanding of the spatial extension of the good reservoir blocks. In the course of the examination conventionally applied plots, MN plots and discriminant function analysis were used. Three rock types were successfully identified along the wells, the graphitic carbonate phyllite, the mylonite and the orthogneiss. On the basis of the results, lithological boundaries could be estimated in numerous wells. These boundaries were presented along geological sections. Taking also the independent hydraulic regimes of the reservoir into account, a series of south-dipping normal fault-bounded blocks are assumed. Inside each block shallow-dipping mylonite/gneiss boundaries with a north-northeast dip direction are typical. The existence of this low-angled (less than 5°) mylonitized zone refers to a presence of a one-time detachment fault linked to the formation of a metamorphic core complex.
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Acknowledgements
We thank MOL Hungarian Oil and Gas Company for making the study of the open-hole well-logs possible. Balázs Kiss is thanked for the fruitful discussions about the behaviour of the KIHA-NE reservoir. Péter Árkai and István Kovács are thanked for the thorough review. This research was supported by the European Union and the State of Hungary, co-financed by the European Social Fund in the framework of TÁMOP 4.2.4. A/2-11-1-2012-0001 ‘National Excellence Program’. English was corrected by Proof-Reading-Service.com.
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Fiser-Nagy, Á., Varga-Tóth, I. & M. Tóth, T. Lithology identification using open-hole well-log data in the metamorphic Kiskunhalas-NE hydrocarbon reservoir, South Hungary. Acta Geod Geophys 49, 57–78 (2014). https://doi.org/10.1007/s40328-013-0037-1
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DOI: https://doi.org/10.1007/s40328-013-0037-1