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Characterization of the Miocene successions in the Schoten borehole (southern North Sea Basin, northern Belgium) and regional correlation with the Netherlands
Deckers, J.; Louwye, S.; Munsterman, D.K.; De Koninck, R.; De Nil, K.; Verhaegen, J.; Algoe, C.; Vergauwen, I.; Adriaens, R.; Everaert, S. (2025). Characterization of the Miocene successions in the Schoten borehole (southern North Sea Basin, northern Belgium) and regional correlation with the Netherlands. Geol. Mag. 162: e9. https://dx.doi.org/10.1017/s0016756825000020
In: Geological Magazine. Cambridge University Press: London. ISSN 0016-7568; e-ISSN 1469-5081
|   |
| Author keywords |
geophysical log correlations; early to late Miocene; Berchem Formation; Borsbeek Member |
| Auteurs | | Top |
- Deckers, J.
- Louwye, S.
- Munsterman, D.K.
- De Koninck, R.
|
- De Nil, K.
- Verhaegen, J.
- Algoe, C.
|
- Vergauwen, I.
- Adriaens, R.
- Everaert, S.
|
| Abstract |
The integration of geotechnical and geophysical well logs, along with biostratigraphic and sediment analyses of borehole Schoten (northern Belgium), provides a better characterization of the glauconite-rich sandy Miocene successions near their type sections. It also provides a way to correlate the latter with more distal areas along the southern North Sea Basin. In the Schoten area, the Rupelian Boom Formation is unconformably overlain by the Lower to Middle Miocene Berchem Formation, which is in turn unconformably overlain by the Upper Miocene Diest Formation (Borsbeek Member). The Berchem Formation is formally subdivided into the Edegem, Kiel and Antwerpen members, which can be identified on the gamma-ray log of borehole Schoten. Sediment analyses show that the glauconite content and the local presence of phosphatic nodules are the main factors contributing to the fluctuating gamma-ray values. For the first time, the geophysical log signatures of the members of the Berchem Formation were correlated across large areas and major fault systems, which shows the regional significance of the boundaries between these members. Indeed, the boundary between the Edegem Member and the Kiel Member corresponds with the boundary between the Dutch Veldhoven and Groote Heide formations, known as the Early Miocene Unconformity. The overall higher gamma-ray values for the middle Miocene Antwerpen Member and equivalents in the upper part of the Dutch Groote Heide Formation are likely related to the eustatic sea level highs during the Miocene Climatic Optimum. |
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