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AAPG Bulletin

Abstract

AAPG Bulletin, V. 89, No. 3 (March 2005), P. 329-357.

Copyright copy2005. The American Association of Previous HitPetroleumNext Hit Geologists. All rights reserved.

Previous HitOriginNext Hit and Previous HittimingNext Hit of Previous HitsandNext Hit Previous HitinjectionNext Hit, Previous HitpetroleumNext Hit Previous HitmigrationNext Hit, and Previous HitdiagenesisNext Hit in Tertiary reservoirs, south Viking Graben, North Sea

R. Jonk,1 A. Hurst,2 D. Duranti,3 J. Parnell,4 A. Mazzini,5 A. E. Fallick6

1Department of Geology and Previous HitPetroleumNext Hit Geology, University of Aberdeen, AB24 3UE, Aberdeen, United Kingdom; present address: ExxonMobil Exploration Company, 222 Benmar Drive GP8-448 Houston, Texas 77060; [email protected]
2Department of Geology and Previous HitPetroleumNext Hit Geology, University of Aberdeen, AB24 3UE, Aberdeen, United Kingdom; [email protected]
3Badley Ashton America, Houston, Texas; [email protected]
4Department of Geology and Previous HitPetroleumNext Hit Geology, University of Aberdeen, AB24 3UE, Aberdeen, United Kingdom; [email protected]
5Department of Geology and Previous HitPetroleumNext Hit Geology, University of Aberdeen, AB24 3UE, Aberdeen, United Kingdom; [email protected]
6Scottish Universities Environmental Research Center, G75 0QF, East Kilbride, United Kingdom; [email protected]

ABSTRACT

Petrographic, fluid-inclusion, and carbon and oxygen stable isotope studies of Tertiary injectite reservoirs in the south Viking Graben of the North Sea allow an understanding of the Previous HitoriginNext Hit and Previous HittimingNext Hit of Previous HitsandNext Hit Previous HitinjectionNext Hit, Previous HitpetroleumNext Hit Previous HitmigrationNext Hit, and Previous HitdiagenesisNext Hit. Previous HitInjectionNext Hit from shallowly (lt400 m; lt1300 ft) buried Paleocene and Eocene unconsolidated sandstones occurred at the end of the Eocene, probably in response to earthquake activity. Liquid oil was already present in the parent sands prior to Previous HitinjectionNext Hit and leaked from the injectites to the seabed. Upward-migrating oil and basinal brines mixed with downward-invading mixed meteoric-marine pore fluids in the injectites, causing extensive biodegradation of the oil. Biodegradation of oil provided the driver for early carbonate cementation in injectites, causing diminished reservoir quality. However, early carbonate cementation also sealed off the injectites as potential escape routes for Previous HitpetroleumNext Hit from the underlying parent sands. Oil (and gas) continued to migrate into the reservoir (parent) sands upon increased burial, causing a mixing of high-API oil with the early charged, extensively biodegraded low-API oil. The study of early diagenetic imprints reveals the evolution of injectite reservoirs, which forms the basis for understanding how to explore and develop them.

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