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Fracture network relationships in Ca2 carbonates from outcrop and well data in the Southern Permian Basin, Germany

Becker, Ivy; Wüstefeld, Patrick; Koehrer, Bastian; Jelinek, W.; Hilgers, Christoph

Abstract:
Understanding fracture network geometries is key for optimizing well planning and improving hydrocarbon recovery in tight carbonate reservoirs. This study integrates outcrop and well data to evaluate their comparability in fracture characteristics. The focus is on Zechstein Ca2 (Stassfurt Formation) carbonates in the Southern Permian Basin, N-Germany. Outcrop data of the Uehrde quarry on the southwestern margin of the Harz mountains exposes dolomitic carbonates resembling slope deposits on the former Eichsfeld-Altmark swell at the southern margin of the Southern Zechstein Basin. Thus, they form an outcrop reservoir analog in terms of stratigraphic position, depositional environment and diagenesis to Wintershall’s operated naturally-fractured Ca2 gas fields approximately 130 km to the northwest. We use the reservoir and analog data to compare their reservoir characteristics regarding matrix porosities and permeabilities, and fracture pattern geometries.

Reservoir characteristics are determined using He-pycnometry and single-phase gas flow in an isostatic flow cell. Matrix permeabilities are very low and range over two orders of magnitude (0.0001-0.001 mD) and porosities vary between 2 and 20% in the outcrop samples, which are compared to reservoir data. ... mehr



Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Vortrag
Publikationsjahr 2017
Sprache Englisch
Identifikator KITopen-ID: 1000126696
Veranstaltung DGMK/ÖGEW-Frühjahrstagung (2017), Celle, Deutschland, 05.04.2017 – 06.04.2017
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