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    Sources of alkylbenzenes in Lower Cretaceous lacustrine source rocks, West African rift basins

    Access Status
    Fulltext not available
    Authors
    Pedentchouk, N.
    Freeman, K.
    Harris, N.
    Clifford, D.
    Grice, Kliti
    Date
    2004
    Type
    Journal Article
    
    Metadata
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    Citation
    Pedentchouk, Nikolai and Freeman, Katherine H. and Harris, Nicholas B. and Clifford, David J. and Grice, Kliti. 2004. Sources of alkylbenzenes in Lower Cretaceous lacustrine source rocks, West African rift basins. Organic Geochemistry 35: pp. 33-45.
    Source Title
    Organic Geochemistry
    DOI
    10.1016/j.orggeochem.2003.04.001
    ISSN
    0146-6380
    Faculty
    Department of Applied Chemistry
    School of Science and Computing
    Faculty of Science and Engineering
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/locate/orggeochem

    Copyright © 2004 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/25121
    Collection
    • Curtin Research Publications
    Abstract

    We conducted molecular biomarker and compound-specific carbon isotope analyses of off-line pyrolyzates from lacustrine samples recovered by ONEZ-1 well (the Kissenda Formation) in the Gabon Basin and Well A (the Maculungo Formation) in the Kwanza Basin in West Africa. Pyrolyzates from ONEZ-1 well contain isotopically depleted 1,2,3,4-tetramethylbenzene (1,2,3,4-TetraMB; 26.1 to 29.4%) and 1,2,4-trimethylbenzene (1,2,4-TriMB; 26.4 to 29.7%), which are isotopically similar to aryl isoprenoids (29.9 and 31.2%) and b-carotane (28.5 to 31.3%) identified in the bitumen fractions. Pyrolyzates from 3 samples in the lower sections of Well A contain isotopicallyenriched 1,2,3,4-TetraMB (ca. 16%) and 1,2,4-TriMB (ca. 14%), consistent with an origin from diagenetic products of isorenieratene/chlorobactene biosynthesized by green sulfur bacteria (Chlorobiaceae). Pyrolyzates from five samples in the upper sections of Well A are characterized by the presence of intermediate carbon-isotope values of 1,2,3,4- TetraMB (20.7 to 22.8%) and 1,2,4-TriMB (19.3 to 21.2%) and isotopically enriched isorenieratane (ca. 14.5%). Off-line pyrolyzates from these lacustrine source rocks represent two distinct end members: 13C-depleted diagenetic products of b-carotene derived from a lacustrine algal source and 13C-enriched diagenetic products of isorenieratene/chlorobactene derived from green sulfur bacteria. Organic matter (OM) from ONEZ-1 well shows a significant proportion of algal biomass with a 13C-depleted composition. The presence of 13C-enriched biomarkers derived from carotenoids of Chlorobiaceae from samples in the lower part of Well A indicates the development of photic zone euxinia and a significant biogeochemical role of sulfur. In the upper section of Well A, the 1,2,3,4-TetraMB and 1,2,4- TriMB have 13C values indicative of contributions from both Chlorobiaceae and algae to the OM.

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