Oil Removal in Prewet Calcite: Active Versus Inactive Ions Investigated by a Fourier Transform Infrared and X-ray Photoelectron Spectroscopy Study.

ABSTRACT: In presalt reservoirs, natural rocks interact simultaneously with formation water (FW) and mineral oil. The prehydrated calcites with FW and demineralized water (DW) are suitable model systems to investigate oil adsorption (removal) on (from) their surfaces by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Preliminary characterization of the chemical composition of fresh cleaved calcite conditioned directly with low salinity (LS) waters, FW, and DW indicates that calcite undergoes (i) surface dissolution once in contact with DW and diluted LS water (LS100) as testified by the split of ν₃ vibration bands of the CO₃^2- group and (ii) partial chemical modification of calcite e through Mg incorporation, water anchoring at the surfa

SUBMITTER: Loreto JM 

PROVIDER: S-EPMC12020411 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature