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The AAPG/Datapages Combined Publications Database
Journal of Petroleum Geology
Abstract
Journal of Petroleum Geology, vol.
There is sedimentological evidence that these organic-rich intervals were deposited in both shallow-water intraplatformal settings, and in deep-water interplatformal basinal settings. The stacking of sequences as a result of evolving platform bathymetry and changes in sea level enhanced the volumetric importance of intraplatformal source rocks, and may explain some of the minor geochemical differences observed among the region's oils.
There is a sharp contrast in the stable isotope composition of the organic matter contained in the different source intervals. The Triassic and Toarcian organic matter is isotopically light (d13Cbitumen lighter than -26o/oo), while Cretaceous and Oligo-Miocene OM is isotopically heavy (d13Cbitumen heavier than -26o/oo).
Although the oils share characteristics associated with carbonate source rock systems, two distinct populations exist. These are an isotopically light population (d13Coil lighter than -26o/oo, typically lighter than -27.5o/oo), which includes the oils at Rospo Mare, Malossa and the degraded oil at Maiella; and an isotopically heavier (d13Coil heavier than -26o/oo) population, including the oils at Monte Alpi, Bagnolo and at the Tramutola seep. The stable carbon isotopic compositions provide the strongest evidence for stratigraphic affinity. Biomarker data permits further refinement of these two "mega-families".
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* Texaco Group Inc., 4800 Fournace, Bellaire, TX 77041, USA. [email protected]** Texaco Exploration Department, 4800 Fournace, Bellaire TX 77401, USA.
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