Outcrop Study
of Heterolithic Tidal Sandstone Bodies in Northeast
Greenland (Jameson Land) for Reservoir
Characterization
Ahokas, Juha
Matti1, Allard W. Martinius2, John Suter3 (1)
University of Oslo, Oslo, Norway (2) Statoil Research
Centre, Trondheim, Norway (3) Conoco,
Inc, Houston, TX
Detailed information about the spatial
distribution of reservoir flow units and barriers is a key factor in successful
management of heterolithic hydrocarbon reservoirs. Multiscale and
high-resolution sedimentological and structural studies of outcrop analogues
are therefore required in addition to subsurface 3D seismic and well data. This
contribution presents preliminary results from an ongoing reservoir analogue
study in Northeast
Greenland.
The study aims at (1) improving conceptual depositional models of shallow
marine tide- and wave-influenced systems characterised
by heterolithic deposits containing abundant shale
layers, and (2) improving subsurface reservoir models and management of the
Early to Middle Jurassic deposits of the Mid-Norwegian Halten
Terrace where large amounts of hydrocarbons are found in paralic,
often strongly tidally influenced and heterolithic
sandstone successions (the Tilje, Ile
and Garn Formations). The Jurassic Neill Klinter
Group of Jameson Land and the Halten Terrace reservoirs were formed on either side of the
North
Atlantic
rift system. They share a similar overall tectonic regime, paleoclimate
and depositional characteristics. Focus of the outcrop analogue study has been
on 3D multiscale reservoir architecture,
heterogeneity and property characterization by i)
detailed facies analysis, ii) defining
system-specific criteria that can be used to construct a sequence stratigraphic framework, iii) sandstone body dimensions,
and iv) shale bed continuities. Outcrop data will be coupled to seismic
responses from the Halten Terrace and used to build
reservoir models. Subsequent flow simulations will test which type of
heterogeneity is most important for hydrocarbon recovery from middle- and
late-life oil and gas/condensate fields.