Fig. 4From: Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)N2, CH4, C2H6, C3H8, i-C4H10, and n-C4H10 content measured in the gas circulating in BPC-C1 borehole from the second argon purge onwards; logarithm scale; GC gas chromatography; IR infrared spectrometry; analytical uncertainty is included within the symbol sizeBack to article page