GEOSCAN Search Results: Fastlink


TitleRelative reactivity of saturated hydrocarbons during thermochemical sulfate reduction
AuthorCai, C; tang, Y; Li, K; Jiang, K; Jiang, CORCID logo; Xiao, Q
SourceFuel vol. 253, 2019 p. 106-113,
Alt SeriesNatural Resources Canada, Contribution Series 20190087
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®); html
Lat/Long WENS 75.0000 89.0000 41.0000 37.0000
Subjectsfossil fuels; geochemistry; petroleum resources; hydrocarbons; oil; condensate; reservoir rocks; isotopic studies; carbon isotopes; organic geochemistry; hydrocarbon geochemistry; sulphate; Tarim Basin; Tazhong Uplift; Manjiaer Sag; Aquitaine Basin; Western Canada Sedimentary Basin; Mobile Bay gas field; Norphlet Formation
Illustrationsplots; location maps; geoscientific sketch maps; tables; spectra
ProgramGeoscience for New Energy Supply (GNES) Canadian Energy Geoscience Innovation Cluster (CEGIC)
Released2019 05 08
AbstractTazhong and four other well-known TSR-altered petroleum reservoirs from around the world were analyzed for their molecular and carbon isotopic compositions of saturated hydrocarbons, thiaadamantanes concentrations or H2S contents to determine the relative stability of saturated hydrocarbons during thermochemical sulfate reduction (TSR). We find that TSR does not preferentially deplete tricyclic terpanes and 17alpha, 21beta hopanes with the 'exposed' tertiary carbon atoms compared to 18alpha (H)-22, 29, 30-trisnorhopane (Ts) and C29Ts that have no tertiary carbon atoms, as proposed by Xia and Gong [35]. However, pristane (Pr) and phytane (Ph) seem to have been preferentially oxidized over normal C17 and C18 alkanes, respectively, resulting in decreasing Pr/nC17 and Ph/nC18 ratios with increasing extent of TSR for the Tazhong and Nisku oils and condensates. iC4 appears to be preferentially depleted relative to nC4 during early TSR stage. At later TSR stage both nC3 and nC4 are oxidized more readily than iC4 in the Mobile Bay Norphlet Formation condensates. Thus, we tentatively propose that relative oxidization order during TSR may start with long chain iso-alkanes followed by n-alkanes, then cycloalkanes, C2-C4 alkanes and finally methane; however, it seems that oxidization of these compounds overlaps significantly.

Date modified: