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A Case Study on
Redevelopment of a Giant Highly Fractured Carbonate 
Field
in
Camus, Denis1, Baham Samimi2, Mohammad Ghanizadeh3, Yves Coury1 (1) BEICIPFRANLAB, Rueil-Malmaison, France (2) NIOC/PEDEC-COPCEP, Tehran, Iran (3) Tehran Energy Consultants, Tehran, Iran
This field is located within the Zagros
fold belt in the South West Iran and is producing in highly fractured carbonate
Asmari and Bangestan
reservoirs. It is a 70 km long anticline with about 50 billions barrels of
initial oil in place and a small initial gas cap; initial oil column is 2000 m
of 32 API crude with properties varying with depth.
The field was discovered in 1937 and produced by natural depletion until 1977
when gas injection was initiated in the gas cap. A total of 320 wells were
drilled on the structure. The study was based on an integrated reservoir
characterization and on 3D modeling studies. A new Master Development Plan was
proposed to maximize hydrocarbon recovery. This presentation will cover: (1)The reservoir characterization mainly based on rock-typing
for both cored and non cored wells, on fracture characterization and modeling
study and on the construction of a full field geostatistical
fine grid model. (2) The reservoir simulations including phenomenological studies
on sector models and a full field simulation model with dual porosity media and
improved black oil options.
Combination of
drive mechanisms acting in this field
such as gas gravity drainage, diffusion
and convection were represented. Various redevelopment options studied indicate
that the overall oil recovery can be improved by gas injection pattern
improvement and selected infill drilling with proper completion strategy.