Variation of gaseous species concentration in the Los Azufres geothermal wells as a tool to study the reinjection effect
Por:
Verma M.P., Tello E., Suárez M.C., González E.
Publicada:
1 ene 2002
Resumen:
Since 1982 the concentration of gaseous species (CO2, H2S, CH4, N2, H2, Ar, and He) has been monitored periodically in the Los Azufres geothermal field, Mich., Mexico by CFE. Here we analyze the variation of gaseous species concentration in order to understand the effect of reinjection on the production fluid. The relative proportions of H2S/CO2 and N2/CO2 are useful parameters to determine the changes in the reservoir characteristics and the effect of reinjection, respectively. Higher values of N2/CO2 were found for all the wells, which are affected by reinjection fluid in the southern zone Tejamaniles, whereas there is no significant effect of reinjection in the northern zone Maritaro. A N2-He-Ar triangular diagram is used to estimate the contribution of meteoric (atmospheric), crustal and magmatic components. The wells in Tejamaniles have relatively higher atmospheric component than the wells in Maritaro. In summary the gas geochemistry of geothermal fluids is a powerful tool to study the effect of reinjection.
Filiaciones:
Verma M.P.:
Instituto de Investigaciones Eléctricas, Apdo. 1-475, Cuernavaca-62001 Morelos, Mexico
Tello E.:
CFE, Gerencia de Proyectos Geotermoeléctricos, A. Volta 655, Morelia, Mich., Mexico
Suárez M.C.:
CFE, Gerencia de Proyectos Geotermoeléctricos, A. Volta 655, Morelia, Mich., Mexico
González E.:
UNICIT-UNAM, Juriquilla, Querétaro, Mexico
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