Pressure and Basin Modeling in Foothill Belts
Résumé
The Papua New Guinea fold and thrust belt petroleum system is studied along a 200km long transect. The kinematic scenario includes the Jurassic rifting and passive margin, the erosion during the Upper Cretaceous related to the Coral Sea rifting and Plio-Pleistocene shortening, with an early growth of the Hedinia anticline limiting lateral migration of oil, in the adjacent Darai Plateau. Data from seven wells and two fields were used to calibrate section boundary conditions and properties. Apart from the high pressure trend in the Kutubu/Moran structures, all data are well reproduced, and the modelled section appears quantitatively predictive. The modelling demonstrates three major pathways for water: (1) topographically driven flow, from the onset of mountain building, (2) deep updip basinal flux, flowing along the tilted reservoirs, and (3) across fault escape from connected reservoir bodies. Type II or mixed type II/III are used to model the Triassic and Jurassic source rock. Maturation starts in the mid Cretaceous and increases strongly during the late tectonic burial, with three main accumulations: (1) the deep part of the Mubi zone, with vertical migration along faults; (2) the Hedinia and Kutubu anticlines charged during Orubadi and Era deposition; and (3) the Darai plateau.
Domaines
Sciences de la TerreOrigine | Fichiers produits par l'(les) auteur(s) |
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