000 02272nab a2200277 4500
005 20260520002148.0
008 260224s2019 xxu ing
041 _aInglés
245 0 0 _aCharacterization of upper palaeozoic organic-rich units in Svalbard
_bImplications for the petroleum systems of the Norgewian barents shelf
260 _a
_b
_cene. 2019
270 _a02/08/2019 ; 02/08/2019
300 _a19 p. ; 59-78
520 _aTranscripción del resumen del autor: Recent discoveries of hydrocarbons along the western margin of the Norwegian Barents Shelf have emphasised the need for a better understanding of the source rock potential of the Upper Palaeozoic succession. In this study, a comprehensive set of organic geochemical data have been collected from the Carboniferous – Permian interval outcropping on Svalbard in order to re-assess the offshore potential. Four stratigraphic levels with organic-rich facies have been identified: (i) Lower Carboniferous (Mississippian) fluvio-lacustrine intervals with TOC between 1 and 75 wt.% and a cumulative organic-rich section more than 100 m thick; (ii) Upper Carboniferous (Pennsylvanian) evaporite-associated marine shales and organic-rich carbonates with TOC up to 20 wt.%; (iii) a widespread lowermost Permian organic-rich carbonate unit, 2–10 m thick, with 1–10 wt. % TOC; and (iv) Lower Permian organic-rich marine shales with an average TOC content of 10 wt.%. Petroleum can potentially be tied to organic-rich facies at formation level based on the gammacerane index, d13C of the aromatic fraction and/or the Pr/Ph ratio. Relatively heavy d13C values, a low gammacerane index and high Pr/Ph ratios characterize Lower Carboniferous non-marine sediments, whereas evaporite-associated facies have lighter d13C, a higher gammacerane index and lower Pr/Ph ratios.
581 _a1
773 0 _tJournal of Petroleum Geology
_g
942 _cARTICULO
100 1 _aNicolaisen, J.B.
_959130
100 1 _aElvebakk, G.
_959131
100 1 _aAhokas, J.
_959132
100 1 _aBojesen-KOefoed, J.A.
_932930
100 1 _aOlaussen, S.
_959133
100 1 _aRinna, J.
_959134
100 1 _aSkeie, J.E.
_948837
100 1 _aStemmerik, L.
_959135
999 _c193103
_d193103