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Geothermal Energy

Science – Society – Technology

Fig. 6 | Geothermal Energy

Fig. 6

From: Petrophysical characterization, BIB-SEM imaging, and permeability models of tight carbonates from the Upper Jurassic (Malm ß), SE Germany

Fig. 6

Typical microstructures identified in the investigated limestone samples. a SE2 image of the BIB cross-section at low resolution (pixel size 800 nm) indicating low visible porosity and moldic porosity associated with a foraminifera. b BSE image of a illustrating homogeneous mineralogy with only a few dolomite grains, pyrite, and organic matter particles. c, d SE2 overview images of visible porosity at high resolution (pixel size: c 29 nm; d 117 nm) indicating the submicron scale of the pore sizes. e) SE2 image displaying one of the relatively few macropores detected in the BIB cross-sections. f High-resolution SE2 image of the typical angular pore geometries in the carbonate host rock

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