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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes


Pub. Id: A031 (1985)

First Page: 639

Last Page: 650

Book Title: SG 20: Alaska North Slope Oil-Rock Correlation Study: Analysis of North Slope Crude

Article/Chapter: Carbon Isotope, Gas Chromatography, and Fluorescence Techniques Applied to the North Slope of Alaska Correlation: SPECIALIZED OR STATISTICAL APPROACHES

Subject Group: Geochemistry, Generation, Migration

Spec. Pub. Type: Studies in Geology

Pub. Year: 1985

Author(s): M. C. Kennicutt II, J. M. Brooks, G. J. Denoux


A number of standard and several unique analytical techniques were applied to the North Slope intercalibration correlation study. Although carbon isotopic compositions, compound type classifications, and n-alkane and aromatic distributions by fused silica, capillary gas chromatography were determined, a unique total scanning fluorescence technique is emphasized. Fluorescence fingerprints for both oils and hexane Soxhlet extracts of shale were determined using a software package developed in house and a Perkin Elmer 650-40 computer-aided fluorometer. Fluorescence data are presented in three dimensions and/or as a contour plot of intensity. Fluorescence patterns are compared on a point-to-point basis to obtain a similarity index (i.e., S.I. = 1.00 for identical spectra and .I. <= 0.000 for completely dissimilar spectra). Oil-oil correlation parameters were unable to clearly delineate separate groups within the 9 oils. On the contrary, most parameters indicated a near continuum in oil compositions. Oil 001 was typical of Prudhoe Bay oil and oil 024 was typical of Simpson-Umiat oils and were chosen as potential end members in this suite of oils based on isotopic and fluorescence analyses. Oils 002, 003, 004, 005, 007, and 008 appeared to be of intermediate or altered compositions, and oil 006 had no apparent generic relationship to the other oils. Source rock-oil correlations suggested that the Kingak and Shublik shales were sources of Prudhoe Bay type oils and that the pebble shale was the main source of Simpson-Umiat oils. Intermediate oils represent va ious admixtures of sources from these three units. The Torok was interpreted as being infiltrated with low-level nonindigenous bitumen sourced in deeper formations and was not a source bed. Both oils and source rocks were typed reasonably independently of maturation and degradation effects by the fluorescence technique. This technique shows promise as a correlation tool.

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