Near-Surface Geophysical Investigation for Characterization of a Volcanic Geothermal Reservoir by Active-Seismic-Data Tomography and Attenuation
G. Bohm, F. Poletto and E. Barison
Event name: 1st Conference on Geophysics for Geothermal and Renewable Energy Storage
Session: Seismic Methods for Geothermal Exploration and Monitoring I
Publication date: 11 September 2019
Info: Extended abstract, PDF ( 708.66Kb )
In this work we present a geophysical analysis of the near-surface data of four active-seismic 2D lines, with the aim to characterize the deeper geothermal reservoir present in the investigated area of Los Humeros (Mexico). We obtained a detailed shallow velocity model in depth from the travel time tomography of the first arrivals computed on all the seismic lines. Using the same data, we also applied the attenuation tomography to define the map of attenuation (Q factor) in the same area. Furthermore, we used both tomographic results to evaluate possible directional and anisotropy effects at the crossing-line positions, and interpret the results in relation to the presence of a fault zone. This analysis, which extends to indicatively 500 – 700 m depth, will be used to improve the deeper imaging of the superhot geothermal reservoir.