使用光谱评估方法评估埃塞俄比亚裂谷系统和邻近高原的居里点深度、热梯度和热流:对地热资源的影响

IF 2.9 2区 地球科学 Q3 ENERGY & FUELS Geothermal Energy Pub Date : 2024-05-10 DOI:10.1186/s40517-024-00291-9
Samson Hilemichaeil, Tigistu Haile, Gezahegn Yirgu
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引用次数: 0

摘要

埃塞俄比亚裂谷系是东非裂谷系在埃塞俄比亚境内的一段,从东北部的阿法尔一直延伸到西南部的肯尼亚边界。很明显,岩浆活动和岩浆侵入影响了埃塞俄比亚裂谷系的地壳形状,导致地壳变薄,其中不同位置的岩浆源变浅。因此,在 ERS 上发现了超过 31 座火山,其热液结构具有产生大量地热能的潜力。在本研究中,我们根据对从世界数字磁异常图中提取的航空磁数据的分析,绘制了 ERS 上的居里点深度(CDP)图。采用光谱评估法估算磁化地壳的边界(顶部和底部)。还原到极点(RTP)气磁记录被划分为 105 个(50%重叠)200 × 200 千米大小的方形块。利用磁铁矿的居里温度(580 °C)确定了该区域的热梯度和热漂移。得到的磁化地壳底部深度假定与居里点深度相对应,在居里点深度,磁层失去所有磁化。在 50%重叠的 105 个区块中,居里点深度、地热梯度和热流的测定值分别为 8.85 至 55.85 千米、10.38 至 65.54 °C/千米和 25.96 至 163.84 mW/m2。在 Mille 和 Gewane(阿法尔西南部)之间、Adama(Nazret)和 Yerer(NMER)之间以及 Wendo Genet 和 Koti(SMER)之间,ERS 的 CPD 较低(< 20 km)。这些地区的 CPD 较低,地热梯度过大,热流量较高,所有这些都表明地热潜力巨大。
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Curie point depth, thermal gradient and heat flow along the Ethiopia Rift System and adjacent plateaus using spectral evaluation approach: implications for geothermal resources

The Ethiopia Rift System (ERS) is a section of the East African Rift System within Ethiopia extending from the Afar in the northeast to the Kenya border in the southwest. It is apparent that magmatism and magmatic intrusions influence the crustal shape in the ERS resulting in its thinning and the shallowing of magmatic sources at various locations within it. As a consequence, more than 31 volcanoes hosting hydrothermal structures with a conceivable potential to generate massive quantities of geothermal energy have been identified along the ERS. In this study, we map the Curie Point Depth (CDP) over the ERS based on the analysis of aeromagnetic data extracted from the World Digital Magnetic Anomaly Map. Spectral evaluation method was used to estimate the boundaries (top and bottom) of the magnetized crust. Reduced-to-pole (RTP) aeromagnetic records have been divided into 105 (50% overlap) square blocks of 200 × 200 km size. The Curie temperature (580 °C) of magnetite was used to determine the thermal gradient and the heat drift in the area. The depths obtained for the bottom of the magnetized crust are assumed to correspond to the Curie Depths, where the magnetic layer loses all its magnetization. The determined values of Curie Point Depth, geothermal gradient and heat flow for the 50% overlapped 105 blocks, respectively, range from 8.85 to 55.85 km, 10.38 to 65.54 °C/km and 25.96 to 163.84 mW/m2. Lower CPD (< 20 km) in the ERS was obtained between Mille and Gewane (southwest Afar), between Adama (Nazret) and Yerer (NMER) and between Wendo Genet and Koti (SMER) localities. These areas, showing low CPD, exhibit excessive geothermal gradient and high heat flow all of which indicate the presence of significant geothermal potential.

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来源期刊
Geothermal Energy
Geothermal Energy Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology
CiteScore
5.90
自引率
7.10%
发文量
25
审稿时长
8 weeks
期刊介绍: Geothermal Energy is a peer-reviewed fully open access journal published under the SpringerOpen brand. It focuses on fundamental and applied research needed to deploy technologies for developing and integrating geothermal energy as one key element in the future energy portfolio. Contributions include geological, geophysical, and geochemical studies; exploration of geothermal fields; reservoir characterization and modeling; development of productivity-enhancing methods; and approaches to achieve robust and economic plant operation. Geothermal Energy serves to examine the interaction of individual system components while taking the whole process into account, from the development of the reservoir to the economic provision of geothermal energy.
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