Characterization of Fractures of Asmari Formation by Using Image Logs, Case Study: Marun Oilfield


Abstract

Asmari formation is one of most important reservoirs in southwest of Iran. Production from this reservoir is mostly due to presence of fracture systems especially in Marun oilfield, hence characterization of fracture zones in reservoir facilitate the specification of perforation zones, analyzing the performance of local faults and fracture networks to prevent problems during drilling operation, and modelling the fracture distribution in reservoir and affect it to geological model of reservoir. In this paper fractures of Asmari reservoir in Marun oilfield were studied by UBI and OBMI. Firstly raw data obtained from logging instrument were processed by GPIT survey, Bore ID, Bore Dip. The results were analyzed by visual and statistical methods, and matched with cores at various depths. Geological features like shear fracture and borehole breakout were identified. Image logs in depth of 3338 m to 3340 m were interpreted and results showed that bedding dip varies between 25° and 56° and most of dip data is between 30° and 46°. Fractures have dip of 35° to 84° that most of dip data range is between 58° to 66°.

Keywords: Asmari, Marun, Fracture, Image Log, UBI, OBMI.

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