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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Nacional Autónoma de México
2002
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=56841307 |
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Sommario:
- Gas geochemistry in modeling geothermal reservoirs A. García V. M. Arellano R. Tovar R. M. Barragán E. Portugal Ciencias de la Tierra Los Azufres Los Humeros Gas geochemistry geothermal reservoir modeling Geochemical models for Los Azufres and Los Humeros geothermal reservoirs are discussed. Los Azufres is defined asvapour-liquid (VAP-LIQ) and Los Humeros is mainly a vapour-dominated field.The geochemical conceptual model for Los Azufres reservoir was based on the spatial distribution of isotopic and chemicalspecies in the reservoir fluid. Based on equilibrium of the Fischer-Tropsch (FT) reaction (CO2+4H2=CH4+2H2O), the reservoirexcess steam parameter was estimated. This parameter was used to correct the total discharge composition of fluids to obtain thecomposition of fluids at reservoir. Results indicated that concentration of volatile species was higher at shallower levels whilenon-volatile species concentration was higher at depth. This pattern suggested the occurrence of a convective process with reservoirvapour separation and condensed vapour down-flows.For the Los Humeros geothermal field, where the liquid phase is scarce, two reservoirs were found, a hotter vapour-dominatedreservoir located at depth and a liquid-dominated shallower one. Gas equilibria based on the Fischer-Tropsch (FT) reactionand on the pyrite-hematite and pyrite-magnetite (HSH2) combined reactions provided both the reservoir temperature and theexcess steam parameters. With exploitation it seems that fluids from the hotter reservoir rise through fractures to the shallowerone. 2002 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56841307 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.3 Vol.41