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Geothermal resources assessment using temperature–depth relationships in the fault-controlled hydrothermal system of Aristino-Traianoupolis area, Northern Greece
Geothermal Energy ( IF 4.2 ) Pub Date : 2022-10-01 , DOI: 10.1186/s40517-022-00232-4
Dalampakis, P., Papachristou, M., Neofotistos, P.

Aristino-Traianoupolis area hosts one of the most significant water-dominated low-temperature geothermal fields in Greece. It is located on the southwestern uplifted margin of the Tertiary Evros Delta molassic basin, 10 km east of the town of Alexandroupolis (Thrace, NE Greece). The upper hydrothermal system of the Aristino Geothermal Field (AGF), one of the most promising in continental Greece, contains fluids with temperatures ranging from 51 to 99 °C, within a series of overlapping aquifers at very low depths (100–430 m). The main geothermal anomaly for temperatures higher than 90 °C covers an area of 6 km2, to a maximum prospected depth of 500 m below ground surface. The scattered regional anomaly exceeds 50 km2 and is characterized by excessively high and abruptly changing thermal gradient (42 to 450 °C/km) and heat flow (80–800 mW/m2), that are both typical of a fault-controlled hydrothermal system. Since 1993, the AGF has undergone non-systematic geothermal investigation, with emphasis on low-depth (100–500 m) drilling. This paper provides, for the first time, a synthetic and detailed evaluation of all available temperature data gathered in the last 25 years. The steady-state temperature logs reveal the dominant role of conduction for the upper geothermal system, accompanied, in most cases, by rapidly changing and abnormally high thermal gradients (100–450 °C/km), triggered, most probably, by a deeper system of higher temperature. This hypothesis is also supported by the applied chemical geothermometers, which suggest initial fluid temperatures at 140–150 °C, the hydrochemical characteristics of the fluids hosted in the deeper and most promising investigated reservoir (ignimbrite) of the upper system, and the extrapolated temperatures from the conductive temperature–depth profiles. The lower widespread medium enthalpy hydrothermal system should extend at depths 500–1000 m within volcanics and the expected Eocene limestones and basal clastic series of the Tertiary sequence that have filled the basin. Nevertheless, these assumptions need to be verified by appropriate investigations and new drillings at depths greater than 600–700 m, which would confirm the presence of a productive medium enthalpy reservoir.

中文翻译:

在希腊北部 Aristino-Traianoupolis 地区断层控制的热液系统中使用温度-深度关系进行地热资源评估

Aristino-Traianoupolis 地区拥有希腊最重要的以水为主的低温地热田之一。它位于第三纪埃夫罗斯三角洲熔岩盆地的西南隆起边缘,亚历山德鲁波利斯镇(希腊东北部色雷斯)以东 10 公里。Aristino 地热田 (AGF) 的上部热液系统是希腊大陆最有希望的地热系统之一,在非常低深度 (100-430 m) 的一系列重叠含水层中包含温度范围为 51 至 99 °C 的流体. 温度高于 90 °C 的主要地热异常面积为 6 km2,最大勘探深度为地表以下 500 m。分散的区域异常超过 50 km2,其特征是温度梯度(42 至 450 °C/km)和热流(80-800 mW/m2)过高且急剧变化,它们都是典型的故障控制热液系统。自 1993 年以来,AGF 进行了非系统地热调查,重点是低深度(100-500 m)钻探。本文首次对过去 25 年收集的所有可用温度数据进行了综合和详细的评估。稳态温度测井揭示了上部地热系统传导的主要作用,在大多数情况下,伴随着快速变化和异常高的热梯度(100-450°C/km),很可能是由更深的更高温度的系统。应用的化学地温计也支持这一假设,表明初始流体温度为 140-150 °C,上系统更深和最有希望研究的储层(炽热岩)中的流体的水化学特征,以及从传导温度 - 深度剖面推断出的温度。较低分布的中焓热液系统应在火山岩内延伸至 500-1000 米的深度,以及填充盆地的第三纪序列的预期始新世石灰岩和基底碎屑系列。然而,这些假设需要通过适当的调查和深度大于 600-700 m 的新钻探来验证,这将证实存在生产性中等焓油藏。较低分布的中焓热液系统应在火山岩内延伸至 500-1000 米的深度,以及填充盆地的第三纪序列的预期始新世石灰岩和基底碎屑系列。然而,这些假设需要通过适当的调查和深度大于 600-700 m 的新钻探来验证,这将证实存在生产性中等焓油藏。较低分布的中焓热液系统应在火山岩内延伸至 500-1000 米的深度,以及填充盆地的第三纪序列的预期始新世石灰岩和基底碎屑系列。然而,这些假设需要通过适当的调查和深度大于 600-700 m 的新钻探来验证,这将证实存在生产性中等焓油藏。
更新日期:2022-10-01
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