Authors:
Tivadar M. Tóth Department of Mineralogy, Geochemistry and Petrology, University of Szeged H-6701 Szeged, P. O. Box 651, Hungary

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É. Szűcs Department of Mineralogy, Geochemistry and Petrology, University of Szeged H-6701 Szeged, P. O. Box 651, Hungary

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Félix Schubert Department of Mineralogy, Geochemistry and Petrology, University of Szeged H-6701 Szeged, P. O. Box 651, Hungary

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Cs. Hollós Hungarian Post IT H-6701 Szeged, P. O. Box 977, Hungary

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Fractured fluid reservoirs are of key importance for recovering water and hydrocarbon supplies and geothermal energy, or in predicting the subsurface flow of pollutants. There are several fractured metamorphic-basement HC reservoirs in the Pannonian Basin; one of the largest among them is the Szeghalom Dome in SE Hungary. Previous production and fluid inclusion data infer that in this case several unconnected fluid regimes must coexist in the basement, making modeling of the fracture network essential. Because the representative volume of a fractured rock mass is usually too large to measure hydraulic properties directly, stochastic calculations should be carried out, which are consistent with observed deformation history and stochastic patterns. Input statistical data (orientation, length, distribution, fractal dimension for fracture seeds) were determined for amphibolite and gneiss samples representing the Szeghalom Dome. Data were measured simultaneously using binocular microscope and computerized X-ray tomography. Comparison of the two data sets suggests that they are comparable and both can be used for modeling. A new computer program, called REPSIM has been developed recently, which follows a fractal geometry-based discrete fracture network (DFN) algorithm to simulate the fracture network. The evaluation of simulated networks suggests that amphibolite and gneiss-dominated parts of the basement behave differently; large amphibolite bodies have a connected fracture network, while gneiss domains usually are well below the percolation threshold.

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Acta Geologica Hungarica
Language English
Size  
Year of
Foundation
1952
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changed title
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Founder Magyar Tudományos Akadémia  
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H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
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H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5278 (Print)
ISSN 1588-2594 (Online)

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