--> Abstract: Jameson Land (East Greenland Onshore): Interpretation of Devonian and Carboniferous Subsurface Sediments Using New Reprocessing Seismic Data and Gravimetric-Magnetic Studies, by M. Viaggi, N. Contavalli, and R. Longoni; #90096 (2009)

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Jameson Land (East Greenland Onshore): Interpretation of Devonian and Carboniferous Subsurface Sediments Using New Reprocessing Seismic Data and Gravimetric-Magnetic Studies

Maurizio Viaggi, Nicoletta Contavalli, and Roberto Longoni
ENI E&P, San Donato Milanese, Italy.

Jameson Land Basin occurs in the east Greenland onshore area near 70° of latitude. It is 520Km long and 100Km wide. Its western margin with the Greenland craton basement is defined by N-S normal fault; the Scoresby Sund inlet represents its southern border. To the north are evident onlap relationships on to basement lithotypes , the east margin is defined by the Liverpool Land ridge.

The basin has a bowl shape thinning to west and east.

Sediments spans from Devonian to Cretaceous with thickness that exceed 5 s TWT.

During 1990 ARCO and AGIP have studied subsurface of Jameson Land area using a 2D coverage (47 lines for ~1600Km)focusing on late Permian sediments.
In 2008 ENI has re-evaluated these data to better know the petroleum potential of Carboniferous/Devonian sediments.

Gravimetric and magnetic studies (ENI elaboration: MDA- GGT) have been run with a preliminary interpretation of the old seismic lines. Occurrence of sill intrusions and basaltic dykes has affected the magnetic data and for this reason a calibration of the basement has failed. Gravimetric data are more useful and has showed the main faults alignments and the important highs.

This first seismic interpretation has underlined the necessity of a new reprocessing.

Since the late Paleozoic deposition has occurred in the East Greenland in a series of basin along the cost. These rifting half grabens are bounded by faults east off and parallel to NNW-SSE trending defined like post Devonian main fault. In the basin Paleozoic sediments are present like a middle Devonian-early Carboniferous syn-rift interval mainly composed by fluvial and lacustrine facies and like late Carboniferous-early Permian syn-rift sequences with alluvial, fluvial and lacustrine facies.

Late Devonian and late Carboniferous lacustrine shale with source rock potential (oil prone) have been recognized. Fluvial sandstone deposited during the late stage of the Devonian-Carboniferous can be considered to have a reservoir potential. Floodplain and lacustrine facies could represent a sealing for a possible petroleum system.

The seismic interpretations have considered four horizons: intra Caledonian, near top Devonian, near top Carboniferous and top of early Permian. Some closures have been identified both for the Carboniferous and Devonian horizons. The real nature of the rock in the more attractive closure has been investigated showing a probalbe predominance of volcanic component.

 

AAPG Search and Discover Article #90096©2009 AAPG 3-P Arctic Conference and Exhibition, Moscow, Russia