Evaluation of the quality, thermal maturity and distribution of potential source rocks in the Danish part of the Norwegian–Danish Basin

• DOI: 10.34194/geusb.v16.4989
• Publication Date: 2020-05-01T12:51:57Z
• Authors: Henrik I. Petersen; Lars H. Nielsen; Jørgen A. Bojesen...; Anders Mathiesen; Lars Kristensen; Finn Dalhoff
• Keywords: Basin modelling

The quality, thermal maturity and distribution of potential source rocks within the Palaeozoic–Mesozoic succession Danish part Norwegian-Danish Basin have been evaluated on basis screening data from over 4000 samples pre-Upper Cretaceous in 33 wells. Lower Palaeozoic basin is overmature Upper – Cenozoic strata no petroleum generation potential, but Toarcian marine shales Jurassic Fjerritslev Formation (F-III, F-IV members) uppermost lowermost Frederikshavn may qualify as parts basin. Neither these has a basinwide distribution; present occurrence was primarily determined by regional early Middle uplift erosion. highly variable. F-III members show significant lateral changes capacity, best-developed occurring centre. combined Haldager-1, Kvols-1 Rønde-1 wells contain 'net source-rock' thicknesses (cumulative thickness intervals with Hydrogen Index (HI)> 200 mg HC/g TOC) 40 m, 83 92 respectively, displaying average HI values 294, 369 404 TOC. Mors-1 well contains 123 m rock' an 221 Parts possess Hyllebjerg-1, Skagen-2, Voldum-1 Terne-1 wells, latter containing c. 160 thick oil-prone interval 478 TOC maximum values> 500 TOC.
 source-rock evaluation suggests that Mesozoic system most likely study area. Two primary plays are possible: (1) Triassic Gassum play, (2) Haldager Sand play. Potential trap structures widely distributed basin, commonly associated flanks salt diapirs. rely charge (Toarcian) or shales. Both tested negative results, however, failure typically attributed to insufficient maturation (burial depth) rocks. This question investigated analysis vitrinite reflectance area, corrected for post-Early uplift. A depth top oil window (vitrinite = 0.6%Ro) 3050–3100 based coalification curves. had not buried this prior exhumation, formation thermally immature terms hydrocarbon generation. generally very mature. Mature Norwegian–Danish thus dependent local, deeper burial reach required Such kitchen areas mature occur central area (central–northern Jylland), few places offshore. These inferred kitchens areally restricted, mainly local grabens (such Trough Himmerland Graben).