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Petrophysical Heterogeneities in Siliciclastic Reservoir Analogs

Schmidt, Christina; Busch, Benjamin; Hilgers, Christoph

Abstract (englisch):
Homogeneous porous sandstones are target horizons for geothermal and hydrocarbon reservoirs due to their high permeabilities. However, their sedimentary and structural heterogeneity may alter flow properties. We analyzed the permeability anisotropies and associated diagenesis of sedimentary and structural fabrics in eolian Rotliegend sandstones and highlight the importance of diagenetic alterations within sedimentary fabric. Results are compared with weakly lithified marine sands, demonstrating the importance of cross-bedding and bounding surfaces on flow.
While deformation bands are known to reduce reservoir permeability by one to three orders of magnitude, the differing degrees of cementation within cross-bedding inhibit flow more effectively. Cross-bedding is best cemented in coarse-grained and uncoated beds. The impact of erosion-derived bounding surfaces is quantified in two Rotliegend outcrops in Germany and the UK.

There is no general correlation recognizable between the different sampling sites whereas porosity and permeability are clearly linked at each site. This can be assigned to mineralogical composition and paragenetic sequence. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Vortrag
Publikationsjahr 2016
Sprache Englisch
Identifikator KITopen-ID: 1000126694
Veranstaltung GeoTirol : Annual Meeting DGGV (2016), Innsbruck, Österreich, 25.09.2016 – 28.09.2016
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