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首页> 外文会议>Geothermal Resources Council Annual Meeting >Is There Any Compositional Link Between Thermal Fluids in Mexican Deep Reservoirs?
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Is There Any Compositional Link Between Thermal Fluids in Mexican Deep Reservoirs?

机译：墨西哥深层水库的热流体之间是否有任何组成环节？

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摘要

A linear ~(18)O-isotopic gradient of 0.43‰ per 100m 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 Cl-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 NaCl-and NaCaCl-type compositions, formed by variable mixing of two components - glacial meteoric and evaporated seawater. Low Cl/Br ratios exclude the influence of halite dissolution from salt domes as a potential Cl-source. In the case of geothermal fluids, their chemical and isotopic fingerprints are mainly defined by high-temperature (up to 400°C) hydrothermal reactions during convective circulation of boiling fluids. Low saline (brackish to marine), NaCl-types reflect the average water composition in Mexican geothermal reservoirs, although Los Humeros fluids can range from NaCl to NaHCO_(3) and NaHCO_(3)ClSO_(4)-type. Measured ~(14)C-activities between 0.8 and 28.2% modern carbon for oil field water reflect enhanced infiltration processes during late Pleistocene and/or early Holocene as a period of increased humidity. Probably, the meteoric component in Mexican geothermal fields can - also indicated by low-level ~(14)C concentrations in Cerro Prieto and Los Azufres - be attributed in parts to this fossil recharge event.
机译：为每100米0.43‰的线性〜（18）O-同位素梯度作为墨西哥地热和油藏深层形成水同位素演变的温度和压力依赖性区域趋势。对于水的矿化阶段，观察到类似的正趋势，从而引起重力的分离过程导致重型Cl-盐的下降。此外，局部效应导致每个储层流体的单独化学和同位素演变：Activo Luna，Samaria-sitio Grande和Pol-Chuc油田水域的特点是宽范围，盐水至氧化盐型NaCacl型组合物，由两个组分的可变混合形成 - 冰川流动和蒸发海水。低Cl / Br比例不含盐圆形作为潜在的ClOce的盐溶解的影响。在地热流体的情况下，它们的化学和同位素指纹主要由在沸腾液的对流循环期间的高温（最多400℃）的水热反应定义。低盐水（咸水到船舶），NaCl系反映了墨西哥地热储层的平均水组合物，尽管LOS Humeros液体可以从NaCl到NaHCO_（3）和NaHCO_（3）CLSO_（4）型。测量〜（14）含0.8至28.2％的C活性，用于油田水的现代碳，反映了晚期优质烯和/或早期全新世期间增强的渗透过程，作为湿度增加。可能，墨西哥地热场的陨石组件可以 - 也可以通过Cerro Prieto和Los Azufres中的低水平〜（14）C浓度表示 - 归因于该化石充值事件的零件。

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