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Progress in geothermal gas research in the last 50 years: a bibliometric review.

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Title: Progress in geothermal gas research in the last 50 years: a bibliometric review.
Authors: Wang, Luyao1 (AUTHOR), Liu, Kai1,2 (AUTHOR) acancer@163.com, Wan, Li1,2 (AUTHOR) wanli@cugb.edu.cn, Zhang, Shouchuan1 (AUTHOR), Jia, Wuhui1 (AUTHOR), Guo, Junhan1 (AUTHOR), Yu, Tingxi1,2 (AUTHOR)
Source: Earth Science Informatics. Jun2025, Vol. 18 Issue 2, p1-24. 24p.
Abstract: Amid energy shortages, air pollution, and global warming, geothermal energy has gained considerable attention as a prominent green energy source. Geothermal gas, which transports material and energy within the Earth, is a central focus of geothermal research. This study conducted a comprehensive bibliometric analysis of 1,258 documents on geothermal gases from the past 50 years in the Web of Science Core Collection (WoSCC) database, utilizing knowledge mapping tools such as CiteSpace, VOSviewer, and Bibliometrix. The results show that research on geothermal gases has evolved through three distinct phases: the exploration phase (1974–1990), the stabilization phase (1990–2015), and the boom phase (2016–2023). Keyword co-occurrence and burst analyses highlight key research hotspots: (1) sources and dynamic processes of geothermal fluids; (2) applications of geothermal gases in exploring blind zones, monitoring seismic and volcanic activity, estimating heat flow, and identifying heat sources; (3) estimation of gas balances and reservoir temperatures in geothermal systems; and (4) recycling of geothermal gases, including carbon dioxide, and their environmental impacts. Enhanced geothermal systems (EGS) with carbon dioxide instead of water as the working fluid are the current and future research frontiers. Co-authorship analysis identifies the United States, Italy, and China as dominant contributors in global collaboration networks. Core institutional hubs include the Consiglio Nazionale delle Ricerche (CNR) and the Chinese Academy of Sciences (CAS), while highly productive authors exhibit cross-regional collaboration patterns concentrated around these centers. Furthermore, co-citation analysis has further identified the core journals and high-impact literature. While the bibliometric analysis effectively highlights current research hotspots and trends, it also reveals limitations in data sources and analytical dimensions. Future research should focus on broader database integration and more in-depth analyses. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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An: 184357817
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  Data: Progress in geothermal gas research in the last 50 years: a bibliometric review.
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Luyao%22">Wang, Luyao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Kai%22">Liu, Kai</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> acancer@163.com</i><br /><searchLink fieldCode="AR" term="%22Wan%2C+Li%22">Wan, Li</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> wanli@cugb.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Shouchuan%22">Zhang, Shouchuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jia%2C+Wuhui%22">Jia, Wuhui</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Guo%2C+Junhan%22">Guo, Junhan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Tingxi%22">Yu, Tingxi</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Earth+Science+Informatics%22">Earth Science Informatics</searchLink>. Jun2025, Vol. 18 Issue 2, p1-24. 24p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Amid energy shortages, air pollution, and global warming, geothermal energy has gained considerable attention as a prominent green energy source. Geothermal gas, which transports material and energy within the Earth, is a central focus of geothermal research. This study conducted a comprehensive bibliometric analysis of 1,258 documents on geothermal gases from the past 50 years in the Web of Science Core Collection (WoSCC) database, utilizing knowledge mapping tools such as CiteSpace, VOSviewer, and Bibliometrix. The results show that research on geothermal gases has evolved through three distinct phases: the exploration phase (1974–1990), the stabilization phase (1990–2015), and the boom phase (2016–2023). Keyword co-occurrence and burst analyses highlight key research hotspots: (1) sources and dynamic processes of geothermal fluids; (2) applications of geothermal gases in exploring blind zones, monitoring seismic and volcanic activity, estimating heat flow, and identifying heat sources; (3) estimation of gas balances and reservoir temperatures in geothermal systems; and (4) recycling of geothermal gases, including carbon dioxide, and their environmental impacts. Enhanced geothermal systems (EGS) with carbon dioxide instead of water as the working fluid are the current and future research frontiers. Co-authorship analysis identifies the United States, Italy, and China as dominant contributors in global collaboration networks. Core institutional hubs include the Consiglio Nazionale delle Ricerche (CNR) and the Chinese Academy of Sciences (CAS), while highly productive authors exhibit cross-regional collaboration patterns concentrated around these centers. Furthermore, co-citation analysis has further identified the core journals and high-impact literature. While the bibliometric analysis effectively highlights current research hotspots and trends, it also reveals limitations in data sources and analytical dimensions. Future research should focus on broader database integration and more in-depth analyses. [ABSTRACT FROM AUTHOR]
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      – Type: doi
        Value: 10.1007/s12145-025-01868-z
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      – Code: eng
        Text: English
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            – D: 01
              M: 06
              Text: Jun2025
              Type: published
              Y: 2025
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