295 Synthesis From resource exploration to drilling project de-risking and asset monitoring Whatever the geothermal systems, it is important to make an inventory of existing geophysical data at the basin (exploration) or project scale (drilling de-risking). For instance, micro seismic recordings are useful to assess the seismicity of the site. For geothermal projects in sedimentary basins, it is important to make an inventory of the seismic lines that have been recorded for oil and gas exploration. The objective is to reprocess these legacy seismic lines using customized processing sequences that make it possible to obtain both an accurate high resolution structural model with distribution of faults and fractures, and a reservoir model with distribution of physical (acoustic impedance) and petrophysical parameters (porosity, permeability). Conventional processing sequences can be adapted to evaluate the potential of geothermal reservoirs, but innovative sequences are being developed. Among these innovative techniques we can mention the use of full-waveform inversion to directly infer temperature, the use of ambient seismic noise for fluid detection or the use of fiber optic for permanent monitoring. Overall, the integration of multiple geophysical methods enhances subsurface imaging and offers more reliable insights, enabling more informed decision-making in resource exploration and drilling project de-risking of geothermal sites. Ultimately, geophysical surveys aim to optimize the success of exploration and minimize risks when planning a new well at the project scale. However, more like others, the subsurface industries now face challenges related to the energy transition, which extend beyond merely identifying sustainable energy sources like geothermal energy. It also involves adapting surveillance technologies for new purposes, such as asset and resource monitoring during production, while addressing economic constraints, and environmental concerns.
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