Application of Raman spectroscopy analysis in unconventional natural gas reservoirs – density and pressure dependence on Raman signal intensity

A simple model to simulate the Raman spectrum of methane in the range of 2800–3040 cm−1

“…However, it is necessary to provide equal spectral characteristics of Raman bands (widths, positions, and line intensities) in the reference spectra and the spectrum of the analyzed sample for the most accurate measurement 19 . Variations in the density and composition of natural gas during on‐line measurements compound the problem because the effects of intermolecular interaction significantly change the methane spectra 20–32 . Nevertheless, the spectrum can be simulated by taking into account the influence of impurities to achieve consistency of spectroscopic characteristics.…”