Geochemical Characterization of Coalbed Methane Systems
Summary
Geochemical characterisation of coalbed methane systems combines aqueous chemistry, stable-isotope analysis and microbial profiling to unravel the origin, migration and preservation of gas in coal seams. Major-ion data (for example Na+, Cl–, HCO3–), trace-element distributions and total dissolved solids inform on water–rock interactions such as cation exchange, carbonate dissolution and pyrite oxidation. Stable isotopes of carbon (δ13C of CH4 and dissolved inorganic carbon), hydrogen (δ2H of CH4 and water) and oxygen (δ18O of water) are used to distinguish thermogenic from biogenic methane and to trace fluid connectivity between coal horizons and adjacent aquifers. High-throughput sequencing of 16S rRNA genes reveals the composition and activity of methanogenic communities, highlighting pathways such as hydrogenotrophic and acetoclastic methanogenesis. Together, these approaches guide resource assessment, optimise dewatering and production strategies, support co-produced-water management, and help to mitigate environmental impacts across global coal-bearing basins.
Research from Nature Portfolio
No recent Nature Portfolio content available.
Geochemical Characterization of Coalbed Methane Systems publication trend
The graph below shows the total number of articles in geochemical characterization of coalbed methane systems across all publications each year (not limited to Nature Index journals).
Technical terms
Dissolved inorganic carbon (DIC): The sum of CO2, HCO3– and CO32– in water, used to trace carbon sources and biogeochemical reactions.
Hydrogenotrophic methanogenesis: A microbial pathway reducing CO2 with H2 to produce CH4, characterised by specific δ13C and δ2H signatures.
Cation exchange: A water–rock interaction in which divalent cations (e.g. Ca2+, Mg2+) are replaced by monovalent cations (e.g. Na+) on mineral surfaces, affecting water chemistry.
Stable-isotope ratio (δ): The per mil (‰) deviation of an isotope ratio (e.g. 13C/12C, 2H/1H, 18O/16O) relative to an international standard, used to infer processes and origins.
16S rRNA sequencing: A molecular method to profile bacterial and archaeal communities by targeting the ribosomal RNA gene, revealing methanogen diversity.
Co-produced water: Formation water brought to the surface during coalbed methane extraction, carrying geochemical information on the reservoir.
References
- Generation of secondary microbial methane of high-rank coals: insights from the microbial community and carbon isotope. Frontiers in Microbiology (2024).
- Biogeochemistry and Water–Rock Interactions of Coalbed Methane Co-Produced Water in the Shizhuangnan Block of the Southern Qinshui Basin, China. Water (2019).
- Hydrogeochemical characteristics and water-rock interaction mechanism of coalbed-produced water in the Linfen mining area, eastern margin of Ordos Basin, China. Frontiers in Earth Science (2023).
About these summaries
This Nature Research Intelligence Topic summary is created with the cited references and a large language model. We take care to ground generated text with facts, and have systems in place to gain human feedback on the overall quality of the process in line with our AI principles. We strive to create accurate and useful summaries for people unfamiliar with the research topic and that supports this goal. These pages are a beta release and will be updated as we learn how best to help people gain value from a research topic summary.
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.