--> Abstract: Constraining the Regional Petroleum System and the Evolution of Pressure Distributions – an Example from the Norwegian Continental Shelf Integrating Basin Modeling and Geochemical Data, by Jon Erik Skeie, Dag Arild Karlsen, Rolando Di Primio, Kristian Backer-Owe, Richard Olstad, Jan Erik Lie, Gawin Lewis, and Harald Brunstad; #90039 (2005)

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Constraining the Regional Petroleum System and the Evolution of Pressure Distributions – an Example from the Norwegian Continental Shelf Integrating Basin Modeling and Geochemical Data

Jon Erik Skeie1, Dag Arild Karlsen1, Rolando Di Primio2, Kristian Backer-Owe1, Richard Olstad3, Jan Erik Lie4, Gawin Lewis3, and Harald Brunstad4
1 University of Oslo, 0316 Oslo, Norway
2 GeoForschungsZentrum Potsdam, D-14473 Potsdam, Germany
3 Chevron, Oslo, Norway
4 RWE Dea Norge AS, Oslo, Norway

The Haltenbanken area has given a lot of surprises in petroleum exploration. These can be divided into source and phase prediction of petroleum, and the dry trend in the western region of high overpressures. In order to constrain the petroleum system in the Haltenbanken area, source rock facies and maturity evolution were given special attention, in order to constrain fluid and phase properties. The model utilizes a multi kinetic approach and a 14n- component equation of state petroleum migration definition. These results need to be critically reviewed as fluid inclusions give important additional information of the system. It is apparent that nearly all structures in the area, have been (at least partly) filled with black oil type petroleum. From both modelling and geochemical data, both oil and gas, seems to origin nearly exclusively from the Spekk formation. In all regions of overpressure the permeability distribution is of critical importance. The regional geometries of sediments and barriers to fluid flow, such as low permeable shales and cemented fault zones will be discussed. The Haltenbanken region will serve as a database and give relevant examples on timing and causes of overpressure from 3D basin modelling. The use of geochemistry both in present reservoirs and fluid inclusions in presently dry structures will serve as important calibration point in delineating petroleum characteristics and hereby communication both at present and past.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005