Raman spectroscopic densimeter for pure CO2 and CO2-H2O-NaCl fluid systems over a wide P-T range up to 360 °C and 50 MPa

Density of fluid inclusions is one of the most important parameters to reconstruct the P-T conditions of entrapment of geo-fluids. Co-existing with microthermometry methods, Raman spectroscopy also became a useful tool to determine the density of CO2-bearing inclusions via Fermi diad splitting (Δ). In this study, a new CO2 densimeter which takes into account the effects of temperature, pressure and H2O (±NaCl) on Fermi diad splitting was built...