Determination of Hydraulic Properties of a Large Self-Propped Hydraulic Fracture in the Geothermal Research Borehole Horstberg Z1 in the Northwest German Basin

Figure 8

Scheme of fracture models: (a) Bed of Nail model, the black bars of different length are a proxy for the asperities determining the deformation laws of the fracture. (b) Zig-Zag model comprising tensile and shear fracture elements. (c) Common model for hydraulic fractures in shale gas reservoirs, the propped fracture is surrounded by a zone of intensely fractured and disturbed rock.

(a)

(b)

(c)