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Compositional Link Between Thermal Fluids in Mexican Deep Reservoirs

Fluids from four geothermal reservoirs in Mexico (Cerro Prieto and Las Tres Virgenes in NW-Mexico; Los Humeros and Los Azufres in Central Mexico) are compared with formation water from oil field reservoirs in SE-Mexico, located offshore (Pol-Chuc) and onshore (Activo Luna, Samaria-Sitio Grande). Geothermal fluids are extracted from more shallow depths (350 – 3,500 m) with maximum temperature conditions of 400 o C, while oil field waters are encountered at depths between 3,000 and 6,200 m. The fast accumulation of thick sedimentary piles in the Gulf basin explains low temperature conditions from 140 o C (Activo Samaria-Sitio Grande) to 170 o C (Activo Luna) under extremely high pressure conditions (up to 800 bar). An increasing mineralization of groundwater with depth is observed in deep Mexican reservoirs, whereby gravitydriven separation represents the principal physical process for the descent of heavy Cl-brines. A linear 18 O-isotopic gradient of 0.43 ‰ per 100 m is proposed as a temperature and pressure dependent regional trend for the isotopic evolution of deep formation water in Mexican geothermal and oil reservoirs.