Achieving an accurate description and modelling of matrix flow properties is complex, and has required a multi-disciplinary approach in order to identify the best way of doing this on the basis of existing petrophysical well logs.
Gaining a realistic impression of matrix properties between wells has greatly benefited from combining Statoil’s cutting-edge techniques for geologically modelling sandstone (siliciclastic) reservoirs with carbonate stratigraphic models.
Nevertheless, much uncertainty remains about how much oil is left in these fields, even after many years of production, and how much can ultimately be recovered.
The key appears to be related to the reliability of certain petrophysical parameters, particularly oil saturation.
Results from on-going special core analysis should improve the position and the collective ability to maximise recovery.
Statoil has also supported the construction of a new reservoir simulation model for Iran’s Bibi Hakimeh field. This task is complicated by dual-porosity simulation and the efficient handling of data from a field with a 37-year production history.