Geochemistry of the oil in the northern Viking Graben

Conference · Sat Sep 01 04:00:00 EDT 1990 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:5923665

Chung, H M; Wingert, W S; Claypool, G E ^[1]

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1. Mobil Research and Development Corp., Dallas, TX (USA)

The composition of crude oils in the northern Viking Graben area reflects the influence of both the type of organic matter and the thermal maturity of Jurassic source rocks in the major basin depocenters, referred to as the Oseberg and Troll kitchens. Forty-four oil samples were analyzed and classified primarily based on chemical composition, but with recognition of constraints on origins imposed by geographic and stratigraphic locations. Five groups are recognized: (1) Snorre oils, (2) Stratfjord-Gullfaks oils, (3) Brent-Oseberg Beta-Veslefrikk oils, (4) Oseberg Alpha-Troll oils, and (5) Agat and Blocks 35/8 and 35/11 oils. The composition of oils in the first three groups reflects the large relative proportions of marine organic matter and the lower expulsion temperatures characteristic of oils derived from the Draupne Formation. The composition of oils in the last two groups reflects source rocks having more terrestrial organic matter and higher expulsion temperatures. The initial phase of hydrocarbon expulsion and migration from the Draupne Formation in the northern Viking Graben began about 56 Ma in the Troll kitchen and about 45 Ma in the Oseberg kitchen. With continued subsidence and heating of Jurassic source rocks gases and condensates were expelled beginning about 40 Ma in the Troll kitchen d about 30 Ma in the Oseberg kitchen. This secondary phase of hydrocarbon generation has mixed with and displaced some of the earlier accumulations.

• OSTI ID: 5923665
• Report Number(s): CONF-9010204--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 74:9
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
023000 -- Petroleum-- Properties & Composition
58 GEOSCIENCES
580000 -- Geosciences
ATLANTIC OCEAN
CHEMICAL COMPOSITION
CHEMISTRY
CLASSIFICATION
CONDENSATES
ENERGY SOURCES
EUROPE
FLUIDS
FOSSIL FUELS
FUELS
GAS CONDENSATES
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
GROUND SUBSIDENCE
JURASSIC PERIOD
LIQUIDS
MESOZOIC ERA
MIGRATION
MINERAL RESOURCES
NATURAL GAS LIQUIDS
NORTH SEA
NORWAY
PETROLEUM
PETROLEUM DEPOSITS
RESOURCES
SCANDINAVIA
SEAS
SEDIMENTARY BASINS
SOURCE ROCKS
SURFACE WATERS
WESTERN EUROPE