Electrofacies analysis - a possible use in Paleogeographic understanding of a North Sea reservoir
Master thesis
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http://hdl.handle.net/11250/300554Utgivelsesdato
2015-06-15Metadata
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Sammendrag
The study area is centered around the B prospect, which is situated in block
34/6, in the northern part of the Tampen Spur area, northern North Sea. In the study
area, lateral changes in reservoir properties of the Lower Jurassic Cook Formation
have been observed as well as the need to understand the overall trend and lateral
continuity of the lithology within the depositional environments. Understanding of the
paleogeography is crucial for prediction and evaluation of the reservoir qualities.
Electrofacies could be a possible tool for reconstructing paleogeographic settings.
The study is based on eight wells drilled on the Cook formation, using basic
log data as input (Gamma Ray, Density, Neutron Porosity Logs), and as additional
logs like Sonic, Deep Induction and the Density-Neutron Separation computation.
Existing petrophysical interpretation is also incorporated, together with information
from cores and sedimentological analysis, to link electrofacies associations with
depositional environment. The final electrofacies model is then propagated in wells
without core data as well as in areas lacking detailed sedimentological analysis.
The results are used to understand the paleogeographic distribution of the
identified lithofacies from one well to another in the area of interest and its possible
implication in terms of:
- reservoir presence and facies typing,
- formation and layer tops correlation
- lateral variation and regional continuity.
Finally, this study can be used for possible future well locations.
Beskrivelse
Master's thesis in Petroleum geosciences engineering