IMPACT OF FLUVIAL SEDIMENTARY HETEROGENEITIES ON HEAT TRANSFER AT A GEOTHERMAL DOUBLET SCALE

Deep Triassic aquifers of the Paris sedimentary basin are located in clastic series which are mainly composed of fluvial deposits. They lie between 2000 and 3000 m depth and their temperature can reach 120°C in some areas. There were few attempts (3) at geothermal exploitation in the early 80's but none of them was really successful (exploitation was performed during one year on one site but injection pump failure and well damage lead to abandonment). In the context of the renewal of geothermal exploration and development in the Paris basin several new projects are now considered. As a preliminary study of the specificities of Triassic aquifers, we investigated the impact of sedimentar