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

Document Type: Original Article


1 Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan, Iran

2 Ahwaz Institute of Technology, Petroleum University of Technology, Ahwaz, Iran

3 Abadan Institute of Technology, Petroleum University of Technology, Abadan, Iran


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°.