Is there any compositional link between thermal fluids in mexican deep reservoirs?
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A linear 180-isotopic gradient of 0.43%0 per lOOm is proposed as a temperature and pressure dependent regional trend for the isotopic evolution of deep formation water in Mexican geothermal and oil reservoirs. A similar positive tendency is observed for the mineralization stage of water, whereby gravity-driven separation processes cause the descent of heavy C1-brines. Additionally, local effects cause an individual chemical and isotopic evolution of each reservoir fluid: The Activo Luna, Samaria-Sitio Grande and Pol-Chuc oil field waters are characterized by a wide range, saline to hypersaline NaC1-and NaCaC1-type compositions, formed by variable mixing of two components - glacial meteoric and evaporated seawater.