SEDIMENTOLOGICAL AND PALEONTOLOGICAL ANALYSIS OF JURASSIC NORTH SEA DEPOSITS FROM DELTAIC ENVIRONMENTS

Autor:	T. Bjaerke, H. Dypvik, J. Nagy
Rok vydání:	1984
Předmět:	biology Broom Energy Engineering and Power Technology Geology biology.organism_classification Mouth bar Debris Foraminifera Sedimentary depositional environment chemistry.chemical_compound Paleontology Fuel Technology chemistry Facies Earth and Planetary Sciences (miscellaneous) Kerogen Bay
Zdroj:	Journal of Petroleum Geology. 7:169-187
ISSN:	1747-5457 0141-6421
DOI:	10.1111/j.1747-5457.1984.tb00173.x
Popis:	Core samples from Well 33/9-3, Norwegian North Sea, have been analysed sedimentologically, palynologically and micro-paleontologically. The cores cover the Toarcian Drake Member of the Dunlin Formation, and nearly the whole thickness of the Middle Jurassic Brent Formation. The Drake Member is characterized by pro-deltaic depositional conditions. In the Brent Formation, five members are recognized (from below): the Broom, Rannoch and Etive Members represent distributary mouth bar facies; while the Ness and Tarbert Members are recognized as interdistributary bay fill sequences. The composition of the kerogen assemblages is controlled by the changing energy regimes of the different depositional facies. Terrestrial plant debris are dominant throughout the studied interval. Marine palynomorphs are present in the Drake Member and in the lower part of the Broom Member. The development of rich, arenaceous foraminiferal assemblages in the Drake Member are interpreted as a response to shallow, pro-deltaic conditions. Calcareous foraminifera constitute only a small, accessorial part of these assemblages.
Databáze:	OpenAIRE
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