The article presents the results of the study of the potential amount, functional and structural-group composition of acidic oxygen compounds (acids and phenols) of the gas condensate of the promising well № 123 of the Bulla-deniz field. The condensate is light in terms of specific gravity, low in sulfur, low in paraffin, and low in resin. Acids and phenols from the condensate were separated into free and bound (from complex esters) forms by extraction. From the Bulla-deniz condensate with an acid number of 0.18 mg KOH/g, only 0.24 % of acidic oxygen compounds were separated, of which 0.076 % were free; 0.034 % were bound acids; 0.164 % were free; 0.053 % were bound phenols. The PMR-spectroscopy analysis method was used to study the structure-group composition of the separated acid and phenolic components. PMR-spectra were recorded on a 300.18 MHs Fourier spectrometer manufactured by "Bruker". The share of protons belonging to different structural groups was calculated based on the integrals of resonance absorption bands. The resonance signal recorded at 0.60-1.10 m.h. is the CH₃ (H_γ) group, 1.10-150 m.h. CH₂-group, 1.50-2.15 m.h. of naphthenic rings (H_n), 2.15-3.10 m.h. CH₂, CH groups located in the α-position due to aromatic rings, and the resonance signals observed at 6.60-8.10 m.h. belong to hydrogen atoms belonging to aromatic rings. From the results obtained, it was determined that the acids in the free state of the Bulla-deniz condensate are mostly paraffin-based, while the acids separated from the complex esters are mostly naphthenic in structure. In free phenols, aromatic rings, groups in the α-position, naphthenic and paraffin structures are almost in close quantities. The degree of aromaticity is relatively low in free acids and bound phenols – 0.26 and 0.30; in free phenols and bound acids, it is the same, equal to 0.33. Terminal –CH₃ groups are between 24-26 % in these compounds.

doi.org/10.32737/0005-2531-2026-2-84-91