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01-09-2020 | Thematic Issue | Issue 18/2020 Open Access

Environmental Earth Sciences 18/2020

Small-scale diagenetic facies heterogeneity controls porosity and permeability pattern in reservoir sandstones

Environmental Earth Sciences > Issue 18/2020
Matthias Heidsiek, Christoph Butscher, Philipp Blum, Cornelius Fischer
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Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s12665-020-09168-z) contains supplementary material, which is available to authorized users.
This article is a part of the Topical Collection in Environmental Earth Sciences on “Sustainable Utilization of Geosystems” guest edited by Ulf Hünken, Peter Dietrich and Olaf Kolditz.

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The fluvial-aeolian Upper Rotliegend sandstones from the Bebertal outcrop (Flechtingen High, Germany) are the famous reservoir analog for the deeply buried Upper Rotliegend gas reservoirs of the Southern Permian Basin. While most diagenetic and reservoir quality investigations are conducted on a meter scale, there is an emerging consensus that significant reservoir heterogeneity is inherited from diagenetic complexity at smaller scales. In this study, we utilize information about diagenetic products and processes at the pore- and plug-scale and analyze their impact on the heterogeneity of porosity, permeability, and cement patterns. Eodiagenetic poikilitic calcite cements, illite/iron oxide grain coatings, and the amount of infiltrated clay are responsible for mm- to cm-scale reservoir heterogeneities in the Parchim formation of the Upper Rotliegend sandstones. Using the Petrel E&P software platform, spatial fluctuations and spatial variations of permeability, porosity, and calcite cements are modeled and compared, offering opportunities for predicting small-scale reservoir rock properties based on diagenetic constraints.
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