Integrated approach for geothermal exploration: Case study from Salar area (Afyonkarahisar, Turkey)

IF 3.5 2区工程技术 Q3 ENERGY & FUELS

Geothermics Pub Date : 2024-06-24 DOI:10.1016/j.geothermics.2024.103068

Ahmet Yıldız , Mehmet Kozak , Can Başaran , Özcan Özyıldırım

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引用次数: 0

Abstract

The intense investment demand in the geothermal sector in Afyonkarahisar province in recent years has enabled the utilization of geothermal waters such as district heating and greenhouse heating, electricity generation, and spa facilities and accelerated the exploration of new geothermal areas in the region. In this study, the Salar (Afyonkarahisar) region's geothermal potential was investigated using the mineralogy and geochemistry of hydrothermal alteration, hydrogeochemistry, and resistivity models obtained from magnetotelluric data. The Salar region is located within the Afyon-Akşehir Graben (AAG) and 10 km south of Afyonkarahisar province. The most important manifestations of the geothermal system are the geothermal water at temperatures of 25 °C and 31 °C obtained from the boreholes and hydrothermal alteration in Salar. Afyon volcanoclastics are reservoir rocks. Smectite and illite are the most important clay minerals in the hydrothermal alteration zones. The transformation from volcanic glass and alkali feldspar to smectite and illite reflects neutral-alkaline alteration conditions in felsic rocks. The clay minerals' stable isotopes (δ_D and δ18O) indicate hypogene conditions. Discharge temperature, electrical conductivity and pH of Salar region geothermal waters vary from 25 to 31 °C, 320–357 µs/cm, and 6.8, respectively. The Salar geothermal waters are Ca-(Na)-HCO₃ type chemically. The electric resistivity models reveal shallow low resistivity (10 < ρ < 80 Ωm) layer related to the alluvium, Gebeceler formation, and Afyon volcanoclastics and deeper high resistivity (80 <ρ < 200 Ωm and ρ > 200 Ωm) layer based on Deresinek and Değirmendere formation respectively. The difference in electrical resistivity arises from the geothermal waters and hydrothermal alteration zones, influenced by the AAG tectonics.

The stable isotopes (δ_D and δ18O) and alpha cristobalite geothermometer calculations indicate that the condition of the temperature in the active and fossil geothermal systems in the Salar does not change, and the condition of the temperature is between 44 °C and 112 °C.

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地热勘探综合方法：撒拉尔地区（土耳其阿菲永卡拉希萨尔）案例研究

近年来，阿菲永卡拉希萨尔省地热行业的投资需求旺盛，使得地热水的利用成为可能，如区域供暖和温室供暖、发电和温泉设施，并加速了该地区新地热区的勘探。在这项研究中，利用热液蚀变的矿物学和地球化学、水文地球化学以及从磁电探测数据中获得的电阻率模型，对盐湖（阿菲永卡拉希萨尔）地区的地热潜力进行了调查。盐湖地区位于阿菲永-阿克谢希尔地块（AAG）内，在阿菲永卡拉希萨尔省以南 10 公里处。地热系统最重要的表现形式是从钻孔中获得的温度为 25 ° C 和 31 ° C 的地热水以及萨尔热液蚀变。阿菲永火山碎屑岩是储层岩石。在热液蚀变区，直闪石和伊利石是最重要的粘土矿物。从火山玻璃和碱长石到直闪石和伊利石的转变反映了长英岩的中性-碱性蚀变条件。粘土矿物的稳定同位素（δD 和 δ18O）表明了下成岩条件。撒拉尔地区地热水的排放温度、电导率和 pH 值分别为 25 至 31 °C、320 至 357 µs/cm 和 6.8。盐湖地热水的化学类型为 Ca-(Na)-HCO3 型。电阻率模型显示，浅层低电阻率（10 < ρ < 80 Ωm）层与冲积层、Gebeceler 地层和阿菲永火山碎屑岩有关，深层高电阻率（80 <ρ < 200 Ωm 和 ρ > 200 Ωm）层分别基于 Deresinek 和 Değirmendere 地层。稳定同位素（δD 和 δ18O）和阿尔法脆岩地热计的计算表明，撒拉尔活跃地热系统和化石地热系统的温度条件没有变化，温度条件在 44 ℃ 至 112 ℃ 之间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geothermics 工程技术-地球科学综合

CiteScore

7.70

自引率

15.40%

发文量

237

审稿时长

4.5 months

期刊介绍： Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.