ABSTRACT:

Bouri field is a giant carbonitic oil field located in the Mediterranean Sea, Libyan offshore. The reservoir is carbonitic (Limestone and Dolomites) characterised by the presence of faults and fractures, concentrated especially in the western part of the reservoir. The fractures have been recognized in narrow zones around the main faults affect the whole reservoir thickness. The presence of micro-fractures has also been recognized in all over the area of the field in connection with some layers. However, the seismic interpretation can only identify the biggest elements (seismic fault). Thence, a population of minor faults and fractures (sub-seismic events) is partially masked. In case of fractured reservoirs such as Bouri Field, a good knowledge of fractures network distribution, intensity and permeability is a key element to perform a successful well location selection and a proper well geometry trajectory (vertical, slanted or horizontal) design. Consequently, this kind of information leads to optimise the well performance. This paper presents the results of different sensitivity runs performed, through 3D Numerical simulation using Eclipse 100 (Black oil) model, to define the utmost appropriate well geometry and perforation intervals location as a function of fractures intensity for sub-sea completion wells.

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