Structural controls on petroleum migration and entrapment within the faulted basement blocks of Szeghalom Dome (Pannonian Basin, SE Hungary)

• DOI: 10.4154/gc.2015.19
• Publication Date: 2015-11-02T12:51:14Z
• Authors: Lászlo Molnár; Tivadar M. Tóth; Félix Schubert
• Keywords: Dome (geology); Basement; Pannonian Basin; Entrapment

The basement of the Pannonian Basin contains several fractured metamorphic hydrocarbon reservoirs that typically form structural highs between Neogene sedimentary sub-basins.One largest reservoirs, Szeghalom Dome, is located on northern margin Békés and mainly composed Variscan gneisses amphibolites with different evolutions.These petrologically incompatible blocks were juxtaposed by post-metamorphic tectonic activity was accompanied formation brittle fault zones higher transmissibilities.The aim this study to define spatial arrangement these their internal architecture integrated evaluations borehole core well-log data from a group wells in central part field.Spatial correlations reconstructed 1D lithologic columns revealed main elements Dome.The low-angle (<15°) thrust faults most likely developed due north-northwest vergent Cretaceous nappe tectonics, which probably responsible for juxtaposition blocks.A complex system normal throughout high provides evidence intense Miocene extensional activity.This phase geodynamic evolution basin believed be horst-graben structure integration results datasets palaeo-fluid evolution, recent production fracture network geometry, indicates importance both migration hydrocarbons adjacent sub-basins overlying sediments development significant storage capacity within strongly rock masses, (mainly amphibolite bodies).These observations fluid flow also emphasized impact strong anisotropic permeability anisotropy reservoir.