Northern Belgium)
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MINISTERE DES MINISTERIE VAN AFFAIRES ECONOMIQUES ECONOMISCHE ZAKEN ADMINISTRATION DE LA BESTUUR QUALITE ET DE LA SECURITE KWALITEIT EN VEILIGHEID GEOLOGICAL SURVEY OF BELGIUM PROFESSIONAL PAPER 1999/1- N.289 BURIAL HISTORY AND COALIFICATION MODELLING OF WESTPHALIAN STRATA IN THE EASTERN CAMPINE BASIN (NORTHERN BELGIUM) by S. Helsen and V. Langenaeker T Q -50001+----r----t----+----+---T------T----1 -350 -300 -250 -200 -150 -100 -50 0 Time (myr) MINISTERE DES MINISTERIE VAN AFFAIRES ECONOMIQUES ECONOMISCHEZAKEN ADMINISTRATION DE LA BESTUUR QUALITE ET DE LA SECURITE KW ALITEIT EN VEILIGHEID SERVICE GEOLOGIQUE DE BELGIQUE BELGISCHE GEOLOGISCHE DIENST GEOLOGICAL SURVEY OF BELGIUM* PROFESSIONAL PAPER 199911, N. 289 BURIAL HISTORY AND COALIFICATION MODELLING OF WESTPHALIAN STRATA IN THE EASTERN CAMPINE BASIN (NORTHERN BELGIUM) by S. Helsen 1 and V. Langenaeker2 1999 1 Historische Geologie, Instituut voor Aardwetenschappen, Redingenstr. 16, B-3000 Leuven present address: ECOREM, Wayenborgstraat 21, B-2800 Mechelen 2 Geologica n.v., Tervuursesteenweg 200, B-3060 Bertem present address: D.H.V., B-3600 Genk Comite editorial : L. Dejonghe, P. Laga, R. Paepe Redactieraad: L. Dejonghe, P. Laga, R. Paepe Service Geologique de Belgique Belgische Geologische Dienst Rue Jenner, 13 - 1000 Bruxelles Jennerstraat 13, 1000 Brussel * «The Geological Survey of Belgium cannot be held responsible for the accuracy of the contents, the opinions given and the statements made in the articles published in this series~ the responsability resting with the authors >). Toute !'information economique en claire et net sur Aile economische informatie rechtstreeks op http : 1/mineco.fgov.be http : 1/mineco.fgov.be Editeur responsable: Roland PAEPE Verantwoordelijke uitgever: Roland PAEPE rue Jenner 13 Jennerstraat 13 1000 Bruxelles 1000 Brussel Depot legal: D 1999/0880/3 Wettelijk depot: D 1 999/0880/3 Table of contents ABSTRACT .............................................................................................................................................................................................................................................................................. 3 KEYWORDS ...................................................................................................................................................................................................................................................................... 3 1. AIM OF THE STUDY .................................................................................................................................................................................................................... 4 2. GEOGRAPHIC AND GEOLOGIC SETTING .............................................................................................................................................. 4 3. MODELLING .......................................................................................................................................................................................................................................... 4 3.1. SOFTWARE ................................................................................................................................................................................................................................................. 4 3.2. INPUT DATA .............................................................................................................................................................................................................................................. 5 3.2.1. Stratigraphic data ..................................................................................................................................................................................................................................... 5 3.2.2. Decompaction data ................................................................................................................................................................................................................................ 5 3.2.3. Porosity and thermal conductivity data ............................................................................................................................................................................ 5 3.2.4. Heat flow models ..................................................................................................................................................................................................................................... 6 3.2.5. Surface temperature model ............................................................................................................................................................................................................ 6 4. RESULTS ....................................................................................................................................................................................................................................................... 6 4.1. BURIAL HISTORY ............................................................................................................................................................................................................................. 6 4.2. COALIFICATION .................................................................................................................................................................................................................................. 7 4.2.1. Carboniferous .............................................................................................................................................................................................................................................. 7 4.2.1.1. Wells KB69, KB 79, KB8l, KB86 and KBI85 ....................................................................................................................................................... 7 4.2.1.2. Wells KB l 15 and KB !63 ................................................................................................................................................................................................................ 8 4.2. I .3. Wells K.Bl74, KBI86 and KBLommel (coalification minimum north ofZolder) .............................................................. 8 4.2. I .4. Wells KBI68, KBI72, K20I and KBI98 ...................................................................................................................................................................... 8 4.2.2. Post-Carboniferous ................................................................................................................................................................................................................................ 8 4.3. HYDROCARBON POTENTIAL......................................................................................................................................................................................... 9 5. CONCLUSIONS ................................................................................................................................................................................................................................... 9 6. ACKNOWLEDGEMENTS .................................................................................................................................................................................................. 10 7. REFERENCES ............................................................................................................................................................................................................................... 10 TABLES .................................................................................................................................................................................................................................................................................... 13 FIGURES ................................................................................................................................................................................................................................................................................ 23 2 ABSTRACT One dimensional basin modelling techniques are applied in the eastern Campine Basin in Belgium to reconstruct the burial history and thermal maturation of coal-bearing strata. Separated by two phases of regional uplift and subse quent erosion, subsidence occurred during the Carboniferous, the Late Permian through Jurassic and the Late Creta ceous to Cenozoic. A model with a first phase of important burial during the Westphalian/Stephanian and a second during the Triassic through Middle Jurassic is proposed. For the western and southern wells it appears that maximum coalification was attained immediately after the first stage of burial. For the other wells, especially for those in the northeastern part of the coalfield, maximum thermal maturation may have evolved from the second phase of heating in the Late Jurassic ahd Early Cretaceous. A best fit between calculated and measured coalification data is obtained by a combination of high heat flows and important packages of Late Carboniferous and Early to Middle Jurassic strata. 2 Heat flows of 102-lll mW/m , assumed for Westphalian and Stephanian times, were succeeded by moderate