Abstract
Several bitumen molecular maturity parameters: alkylnaphthalene ratios—MNR, ENR, DNR; methylphenanthrene indices—MPI 1, MPI 2, DPI; n-C 17/pristane; pristane/phytane; C 15+ alkane distributions and GC-MS analyses of triterpanes, steranes, diasteranes, triaromatic steroids, and monoaromatic steroids for samples of the Ikpikpuk well, Alaskan North Slope, are reported. The molecular maturity parameters are compared and contrasted with previous data for lower molecular weight C 1-C 7 hydrocarbons, production index, vitrinite reflectance, and thermal alteration index. Bitumen maturation indices, C 15+ alkane distributions, and distributions of steranes, diasteranes, triterpanes, triaromatic and monoaromatic steroids agree with kerogen maturation indices in the Kingak section of Ikpikpuk well. Bitumen maturation indices and distributions of steranes, diasteranes, triterpanes, triaromatic and monoaromatic steroids diverge from vitrinite maturation profiles for the Shublik section of Ikpikpuk indicating either a major influence of changes in kerogen type or the presence of residues of expulsion/migration in the Shublik. The data are consistent with the Shublik being a source and/or conduit of migration of oil.
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