Petroleum Systems Modelling as a Screening Tool in the Evaluation Cycle, A Case Study From the Helgeland Basin, Mid-Norway
S. DÖRING1, K.C. FISCHER1, U. MÖLLER1, and B. UJETZ2
1Wintershall Kassel
2Wintershall Norge AS
As part of a regional study for Mid-Norway, several open blocks bordering the sparsely drilled Helgeland Basin on its western and northwestern side were evaluated geologically. The area was about 140 x 175 km in size and included 9 blocks and 3 half blocks (one block is 15 x 28 km) open for application. Since the 6 wells in the Helgeland Basin drilled valid and sealed structures without finding commercial hydrocarbon accumulations, the highest risk was allocated to the hydrocarbon charge from the beginning of the evaluation. Hence a regional 3D petroleum systems model was built from a very early point which then guided the evaluation process.
For the general understanding of the basins thermal history, pseudo-well locations were defined and modelled. These gave quick insights on timing and temperature evolution and guided further study objectives. Results confirmed the low maturity of the proven source rocks (Lower and Upper Jurassic) and therefore an alternative source rock had to be taken into account. Assumptions in this respect were based on the geochemistry of oil shows within the Helgeland Basin which point towards a Pre-Jurassic source and on geochemical data from Permian and Triassic source rocks which were drilled in a shallow



AAPG Search and Discover Article #90066©2007 AAPG Hedberg Conference, The Hague, The Netherlands
AAPG Search and Discover Article #90066©2007 AAPG Hedberg Conference, The Hague, The Netherlands