Multiple fractures are preferred because of the more » large size necessary when using only a single fracture. Furthermore, in the absence of natural fractures or adequate connectivity, artificial fractures are created in the reservoir using hydraulic fracturing. Therefore, knowledge of the conditions leading to formation of fractures and fracture networks is of paramount importance. Therefore, cracks and fractures play a significant role in extraction of geothermal energy by providing the major pathways for fluid flow and heat exchange. Geothermal reservoir rock masses generally consist of igneous and metamorphic rocks that have low matrix permeability. Geothermal energy is recovered by circulating water through heat exchange areas within a hot rock mass.
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