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Reservoir quality evolution of Upper Carboniferous (Westphalian) tight gas sandstones, Lower Saxony Basin, NW Germany

Becker, Ivy; Busch, B.; Koehrer, B.; Adelmann, D.; Hilgers, Christoph

Abstract:
This paper investigates reservoir quality development in tight Upper Carboniferous fluvial sandstones (Westphalian C/D) in the Lower Saxony Basin, NW Germany. The study integrates data from three outcrops (Piesberg, Woitzel and Hüggel) in the south of the basin with that from two wells (Wells A and B) located at gas fields approximately 50 km to the north. Petrographic and petrophysical data are related to the diagenetic evolution of the sandstones and the burial and structural history of the Lower Saxony Basin. The outcrop and subsurface data sets are compared in order to investigate the factors controlling reservoir quality evolution.

Upper Carboniferous fluvial sandstones from the Woitzel and Hüggel outcrops and from Wells A and B have similar matrix permeabilities (0.01 to 10 mD), but matrix porosities vary between Well A (average 6%), Well B (average 10%), Woitzel (average 15%), and Hüggel (average 19%). Permeability reduction during burial is related to the formation of clay mineral cement, which was mainly controlled by variations in both the palaeo‐climate and in the sandstones’ depositional composition. Matrix porosity was controlled by local differences in burial history related to basin inversion tectonics. ... mehr



Originalveröffentlichung
DOI: 10.1111/jpg.12742
Scopus
Zitationen: 4
Web of Science
Zitationen: 2
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2019
Sprache Englisch
Identifikator ISSN: 0141-6421, 1747-5457
KITopen-ID: 1000098343
Erschienen in Journal of petroleum geology
Verlag Wiley
Band 42
Heft 4
Seiten 371–392
Vorab online veröffentlicht am 16.09.2019
Nachgewiesen in Scopus
Web of Science
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