Computer Science
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..701l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 3, pp.701-713
Computer Science
Scientific paper
In mature, oil-prone source rocks of the Upper Jurassic Kimmeridge Clay in the Brae field area. North Sea, the yield and the gross composition of solvent-extractabte pctroleum-likc compounds, as well as the molecular proportions of C 15+ -saturated hydrocarbons, are primarily controlled by the effects of hydrocarbon expulsion during primary migration. Within sample series extending from shale centres towards adjacent reservoir sandstones, regular and pronounced yield decreases have been documented, as well as marked compositional changes for C 15+ -soluble organic matter and its compound class fractions (saturated hydrocarbons, aromatic hydrocarbons, NSO-compounds) and for normal and isoprenoid alkanes. Relative migration losses indicating relative expulsion efficiencies were determined for the C 15+ -alkanes. Throughout the outer five meters of thick shales relative expulsion efficiencies increase regularly and drastically for all compounds considered, e.g . exceeding 90% for the C 15+ - n -alkanes in the outermost shale samples. Samples from thin (5-50 cm) shale layers interbedded between reservoir sandstones reveal similarly high expulsion efficiencies. For n -alkanes, the degree of depletion remains uniform throughout the molecular range C 15 to C 30 i.e . no compositional fractionation occurred during primary migration, which is interpreted to reflect expulsion of oil as a single phase fluid. A simple conceptual model is proposed to explain the mechanisms and relationships of generation and expulsion processes in time and space. A geochemically-relevant conclusion is that the C 15+ -soluble organic matter recovered by solvent extraction of mature source rocks represents only a portion of the total non-volatile petroleum-like material originally generated.
Leythaeuser Detlev
Radke Matthias
Schaefer Rainer G.
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