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Geochemical Characteristics of the Menengai Geothermal Reservoir, Kenya: An Overview

机译：肯尼亚梅嫩盖地热库的地球化学特征概述

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This paper presents an overview of the chemical characteristics of Menengai geothermal wells discharge fluid. The fluid discharge from Menengai generally exhibits widely varying chemical properties from well to well. This observed variability points to heterogeneity of the reservoirs feeding Menengai wells. The fluid discharge belongs to the NaHCO_3 facies although a Na-HCO_3-Cl type is inferred for some of the wells located in the northern part of the central sector, in the vicinity of well MW-19. Most wells in Menengai have excess enthalpy which is largely attributed to phase segregation. Three models were used to assess gas-mineral equilibria assuming a closed, isolated and an open system. The models show that CO_2 and H_2S in the reservoir(s) in Menengai are largely controlled by hydrothermal minerals but H_2 is higher suggesting the presence of significant vapor fraction in the reservoir(s) feeding Menengai wells, albeit in varying proportions. The water recharging the Menengai reservoir is meteoric in origin while a mantle source is inferred for the gases. The main upflow is located within or in the locality of well MW-13 situated in the central part of the Menengai geothermal field. The main process influencing the chemistry of Menengai wells discharge fluid is boiling and phase segregation. Conductive heat transfer/cooling and to some extent addition of magmatic fluids are other factors that contribute.
机译：本文概述了Menengai地热井排出流体的化学特性。从Menengai排出的流体通常在不同的井之间表现出很大的化学性质。这种观察到的变异性表明了向梅嫩盖井供油的储层的非均质性。流体排放属于NaHCO_3相，尽管推断出中部北部（MW-19井附近）的某些井为Na-HCO_3-Cl型。 Menengai的大多数井都有过多的焓，这主要归因于相分离。假设采用封闭，隔离和开放的系统，则使用三种模型评估气体-矿物平衡。模型显示，梅嫩盖（一个或多个）储层中的CO_2和H_2S受热液矿物的控制很大，但H_2含量较高，这表明向梅嫩盖井供油的一个或多个储层中存在显着的蒸气分数，尽管比例不同。给梅嫩盖水库注水的源头是流星，而推断出地幔源则是气体。主要的上升流位于Menengai地热田中心的MW-13井之内或附近。影响Menengai井排出流体化学性质的主要过程是沸腾和相分离。传导热传递/冷却以及一定程度上添加岩浆流体也是其他因素。

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