利用磁谱分析和三维重力反演评价印度奥里萨邦东高止山脉活动带Mahanadi地热省南部地热设施

IF 3.5 2区工程技术 Q3 ENERGY & FUELS

Geothermics Pub Date : 2025-01-23 DOI:10.1016/j.geothermics.2025.103261

Ananya Parthapradip Mukherjee, Animesh Mandal

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引用次数: 0

摘要

该研究旨在通过破译该地区的地壳结构和热机制，建立位于东高止山脉活动带中部的Mahanadi地热省的四个温泉的发生与普遍的构造设置之间的可能联系。利用EMAG2v3磁异常资料，采用质心法估算居里点深度（CPD），从而得到研究区相应的地温梯度和热流值。CPD值为19.5 ~ 32 km，地温梯度值为26.6 ~ 43.6 K/km，热流值为66.5 ~ 109.1 mW/m2。CPD结果比全球栅格重力数据三维反演和地壳1.0模型得到的莫霍深度变化更浅。计算了研究区内主要岩石类型放射成因产热（RHP）的地表热流，并与CPD估算结果进行了比较。CPD计算的平均热流估计值（即77.5 mW/m2）和RHP估计值（即70.2 mW/m2）都高于全球平均值，这意味着薄磁壳的放射性源和来自较深部分的热量的综合影响。Mahanadi剪切带周围较浅的CPD和较高的热流表明，它是深层热源和近地表富含放射性元素区域的热加热流体进入Deulajhari、Atri和Tarabalo地热系统的途径。Taptapani温泉的CPD相对较深，热流值较低，热水可能通过附近的剪切带和相关的断裂/断裂系统从远处输送到该温泉。因此，研究表明，温泉周围的剪切带和断层/断裂系统对地热系统的发育起着至关重要的作用，同时放射成因热也起着重要的作用。

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Appraisal of geothermal setup using magnetic spectral analysis and 3D gravity inversion for the southern part of Mahanadi geothermal province within Eastern Ghats Mobile Belt, Odisha, India

The study aims to establish possible linkages between the occurrence of four hot springs of the Mahanadi geothermal province, lying in the central part of the Eastern Ghats Mobile Belt, and the prevalent structural setup, by deciphering the crustal configuration as well as the thermal regime of the area. The centroid method is used for estimating Curie point depths (CPD) utilizing the EMAG2v3 magnetic anomaly data, thereby to obtain the corresponding geothermal gradient, and heat flow values for the study area. The CPD, geothermal gradient, and heat flow values range from 19.5 km to 32 km, 26.6 K/km to 43.6 K/km, and 66.5 mW/m² to 109.1 mW/m², respectively. The CPD results are shallower than the Moho depth variations obtained from the 3D inversion of global gridded gravity data and the CRUST1.0 model. The surface heat flow due to radiogenic heat production (RHP) of the major rock types within the study area is calculated and compared with that obtained from the CPD estimates. The average heat flow estimates from the CPD calculations (i.e., 77.5 mW/m²) and from the RHP estimates (i.e., 70.2 mW/m²) are both higher than the global mean value, implying a combined influence of radiogenic heat sources of the thin magnetic crust as well as heat from the deeper part. The shallower CPD and higher heat flow around the Mahanadi Shear zone region, indicate its role as the pathway for the thermally heated fluids from both deeper sources and near-surface radioelement-rich areas to the geothermal systems of Deulajhari, Atri, and Tarabalo. The Taptapani hot spring corresponds with a relatively deeper CPD, and lower heat flow values, where thermal water is possibly transported to it from a far-away source by the nearby shear zones and associated fracture/fault systems. Thus, the study suggests that the shear zones and the fault/fracture system around the hot springs play a vital role in developing these geothermal systems, along with the contribution of the radiogenic heat.

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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.