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Small-scale diagenetic facies heterogeneity controls porosity and permeability pattern in reservoir sandstones
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Small-scale diagenetic facies heterogeneity controls porosity and permeability pattern in reservoir sandstones
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Small-scale diagenetic facies heterogeneity controls porosity and permeability pattern in reservoir sandstones
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Journal Article
Small-scale diagenetic facies heterogeneity controls porosity and permeability pattern in reservoir sandstones
2020
Overview
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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