Sammendrag
For a subsurface CO2 storage it is imperative to evaluate the
reservoir, seal and overburden viability to avoid any storagerelated
problems, or subsequent leakage risks. Whereas, in
case of a hydrocarbon trap, the presence of oil and gas itself
validates a working reservoir, seal and overburden system.
The upper Jurassic Sognefjord Formation is a potential CO2
storage formation overlain by the Heather and Draupne
Formations considered to be the cap rocks in the Smeaheie
area within the northern North Sea. In this study, we
extracted spectral decomposition and similarity attributes at
various levels from the top reservoir to the sea floor from a
3D seismic survey covering the area. The attributes
facilitated to identify various fault systems and surface
features. A prestack seismic inversion was also carried out
to obtain elastic property cubes, i.e. acoustic impedance,
Vp/Vs ratio, and density. These elastic properties showed
changes as a function of compaction and will be used to
build a geomechanical model in the next stage of the study.
The geological and geophysical properties derived from the
seismic attributes, well logs and laboratory measurements of cores/cuttings will be used to calibrate the model.
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