Abstarct: Due to limited fossil fuel resources and their non-renewable nature, there exist a great need for maximum recovery of oil reservoirs. Hydraulic fracturing Treatment (HFT) is a common stimulation technology which is being used to enhance hydrocarbon production and recovery factor consequently. Studies have shown that the successful operation of hydraulic fracturing mostly depends on selection of candidate well and laxyer. Generally, the purpose of selecting a candid is selecting one or a group of wells or zones with the most probability of success. In general, the purpose of selecting candidates is the selection of one or a group of wells or zones for HFT that are most likely to succeed. Researches have shown that appropriate selection of candidate wells and laxyers, may lead to increase in production, especially in wells with high skin factor and low permeability. Most of the carbonate reservoirs are less permeable, hence, they can economically produce when being hydraulically fractured. In this research, with the aim of selecting candidate laxyers in wells NO. 488 and 397 in Bangestan reservoir of Ahvaz oil field, a one-dimensional geomechanical model was created using geological data, petrophysical logs (including porosity, density, sonic, etc.), drilling reports, imaging logs and well integrity tests. Then, baxsed on studies conducted, reservoir conditions and wells data, six main criteria –including thickness, porosity, saturation, stress contrast between target zone and upper and lower zones, Fracability Index (FI) and Total Fracability Index (TFI)- were selected as the most important and influential factors for selecting candidate laxyers in the wells under study. The next step was to Identify and analyze the hydraulic fracturing operation candidate laxyers baxsed on mentioned criteria. Finally, Choquet and Sugeno fuzzy integrals were used in order to reduce the risk and uncertainty in selection and prioritization of the most suitable candidate. baxsed on the obtained results, In Ilam formation, laxyers of C1-C2 in well NO. 397 (from depth 3354 to 3403 m), C2-2 in well NO. 397 (from depth 3432 to 3450 m) and C1-1 in well NO. 488 (from depth 3367 to 3395 m) and in Sarvak formation laxyers E2-1 in well NO. 397 (from depth 3659 to 3683 m) and E1 in well NO. 397 (from depth 3589 to 3608 m) are best candidates for implementing hydraulic fracturing operation.