The invention relates to a method for determination of a quality parameter of a hydrocarbon gas mixture, such as LNG, CNG or SNG, the method comprising subjecting at least a part of the hydrocarbon gas mixture to an NMR reading comprising generating a 1H data comprising a 1H NMR spectra and correlating the 1H NMR data to calibration data, wherein the calibration data relates the 1H NMR data to at least one quality parameter of the hydrocarbon gas. The invention also relates to a system suitable for determination of a quality parameter of a hydrocarbon gas mixture according to the method.
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