Tasmanites algae—contributors to the Middle Triassic hydrocarbon source rocks of Svalbard and the Barents Shelf

Polar research

Arne W. Forsberg¹  Wolfgang Weitschat³  Atle Mørk³  Jorunn O. Vigran⁴  Hermann M. Weiss⁵ 

[1] Department of Geology and Mineral Resources Engineering, Norwegian University of Sciences and Technology, NO-7491 Trondheim, Norway;Geological-Paleontological Institute, University of Hamburg, Bundestrasse 55, DE-20146 Hamburg, Germany;SINTEF Petroleum Research, NO-7465 Trondheim, Norway;SINTEF Petroleum Research, NO-7465 Trondheim, NorwayCorrespondence;StatoilHydro ASA, NO-0246 Oslo, Norway

关键词: Algae;    Barents Shelf;    source rocks;    Tasmanites;    Triassic;   

DOI  :  10.1111/j.1751-8369.2008.00084.x

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

When moving from west to east across Svalbard, organic geochemical, palynological and sedimentological data from the Middle Triassic dark shales of the Sassendalen Group show an improved quality of hydrocarbon source rock (kerogen type II/III), and an increased abundance of structured algal material, including Tasmanites. Triassic specimens of Tasmanites in palynological residues from Svalbard are generally of small size (< 100 mm in diameter). Tasmanites of variable size, and the associated degradation products, occur frequently in Middle Triassic dark shales, and extraordinarily large-sized specimens (phycomata < 500 mm in diameter) are recorded in silty shales and siltstones palynologically dated as being of Ladinian–Carnian age. Similar occurrences are also present in deposits of the Norwegian Barents Sea. Our organic geochemical analyses suggest that Tasmanites is a major source for the hydrocarbons encountered in these rocks. Tasmanites algae are also enriched in Ladinian–Norian deposits in Taimyr, ...

【 授权许可】

CC BY-NC