en.Wedoany.com Reported - The final results of the GEOSCAN geothermal exploration project have recently been released.
Although the Île-de-France region is home to 54 deep geothermal facilities, development in the southern and western areas remains limited, primarily due to insufficient subsurface geological data. Launched in November 2023, the GEOSCAN project covers nearly 300 municipalities across an area of approximately 2,000 square kilometers. The research team collected over 280 kilometers of geophysical data and integrated it with 1,660 kilometers of existing 2D seismic lines, 12 kilometers of electromagnetic geophysical data, and data from nearly 80 oil and geothermal wells to construct a complete 3D geological model of the study area.
The study focused on documenting new information about three key geological reservoirs. The first is the Oxfordian reservoir, buried at depths between 700 and 1,600 meters, with temperatures ranging from 40°C to 65°C. This formation has never been used for geothermal development in the Île-de-France region, and its production capacity is expected to be lower than that of the Dogger aquifer. However, when combined with heat pumps or used as an extension of existing heating networks, geothermal fluids from this layer could serve as a significant supplementary resource for the region's geothermal utilization.
The second is the Dogger formation, currently exploited by 54 facilities, which produced approximately 1.97 TWh of geothermal energy in 2025. Research indicates that the Dogger still contains geothermal fluids in western and southern Île-de-France, though productivity may be lower than in the Paris area. The project clearly identified low-permeability marl facies and potentially productive limestone formations, with geothermal fluid temperatures ranging from 50°C to 80°C from west to east.
The third is the Triassic formation, previously unexplored in the Île-de-France region. The study deepened understanding of its structure and identified three significant reservoirs: Donnemarie, Chaunoy, and Boissy. Further targeted investigations, particularly local 3D seismic acquisition, are needed to assess its development potential.
Project results data have been published in the GEOSCAN Project Results section of the Geothermies website. The technical findings will help improve preliminary studies conducted by local governments and support risk reduction for geothermal project development in the region.
This article is compiled by Wedoany. All AI citations must indicate the source as "Wedoany". If there is any infringement or other issues, please notify us promptly, and we will modify or delete it accordingly. Email: news@wedoany.com
