Methane Isotope Compositions from French Alps Gas Seeps
Updated 3mo ago
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Description
October 2019 sampling captured gas composition and isotope data from two natural gas seepage sites near Grenoble, France. The dataset includes analyses of methane δ13C, δD, CO2 δ13C, δ15N, and methane clumped isotopes (Δ13CD, ΔDD) for 5 samples collected at Fontaine Ardente and Rochasson sites. It was created within the SECURe project funded by the European Union's Horizon 2020 programme.
Use Cases
Correlate methane δ13C and δD values with geological fault structures to trace gas migration origins.
Analyze methane clumped isotope data (Δ13CD and ΔDD) to investigate methane formation temperatures and processes.
Compare gas composition profiles (C1-C5, CO2, N2) between the Fontaine Ardente and Rochasson seepage sites.
Integrate new methane clumped isotope data with previously published isotopic data for temporal trend analysis.
Strengths
Data includes specialized methane clumped isotope analyses (Δ13CD and ΔDD), which are relatively rare measurements.
Samples provide direct field measurements from two distinct natural gas seepage sites with described geological contexts.
Dataset is part of the SECURe project, a European Union Horizon 2020 funded research initiative.
Limitations
Very small sample size of only 5 samples limits statistical power and generalizability.
Geographic coverage is restricted to two specific sites in the French Alps, southwest and east of Grenoble.
Temporal coverage is a single snapshot from October 2019, lacking longitudinal data.
Provenance
Source
British Geological Survey (BGS), created within the SECURe (Subsurface Evaluation of CCS and Unconventional Risks) project.
Collection Method
Field sampling and laboratory analysis of gas composition and isotopes, including clumped isotopes.
Time Range
Sample collection in October 2019.
Freshness
Data last updated March 2026, but core sample collection occurred in October 2019.
Geography
Fontaine Ardente and Rochasson natural gas seepage sites near Grenoble, French Alps, France.
Dataset is linked to previously published data; users may need to locate the Gal et al. (2017) study and SECURe deliverable 3.4 for full context and correlation.