Oilfield     On/Offshore  Capacity*  Pressure        Category ^                             ('000     Support                                     bpd)                         Ahwaz        Onshore         870     None            1/X**  Gachsaran    Onshore         530     Gas Injection   4  Marun        Onshore         510     Gas Injection   4  Karanj       Onshore         237     Gas Injection   4  Abouzar      Offshore        180     None            1/X  Rag-e Safid  Onshore         180     Gas Injection   4  Darkhovain   Onshore         160     Gas Injection   4  Agha Jari    Onshore         155     Gas             3  Mansuri      Onshore         150     Gas Injection   4  Doroud       Offshore        145     Gas/Water       4                                       Injection         Bibi         Onshore         116     Gas Injection   4  Hakimeh                                                Soroush      Offshore        110     Water           2                                       Injection         Sirri        Offshore        90      Water           2                                       Injection         Parsi        Onshore         90      Gas Injection   4  Nowrouz      Offshore        60      Water           2                                       Injection         Shadegan     Onshore         60      None            1/X  Kupal        Onshore         56      Gas Injection   4  Salman       Offshore        55      Water           2                                       Injection         Azadegan     Onshore         50      None            X  Forouzan     Offshore        45      None            X  Ab Teymour   Onshore         42      None            X  Pazanan      Onshore         40      None            1  TOTAL                       3,931                      Source: Neftex geological consultancy  * Estimated in 2012;  ** Category X applies to 150,000 bpd of capacity in the Bangestan reservoir ^ Oilfield categories:        1 - Fields with natural aquifer pressure and no gas or water injection: 1 million barrels per day (bpd)     2 - Fields with limited aquifer pressure support and water injection: 315,000 bpd      3 - Fields with limited aquifer pressure and supported by gas injection from non associated gas fields: 155,000 bpd      4 - Fields with limited aquifer pressure and supported by recycled associated gas injection and or gas from gas caps in other oilfields: 2.174 million bpd     X - Fields where pressure support by water or gas injection has yet to be installed: 527,000 bpd       Closing in production in any of the Category 1, 2 and 3 oilfields would not cause any reservoir damage, and would in fact prove beneficial, according to Peter Wells of Neftex geological consultancy.     Category X oilfields are most at risk. If sanctions persist over 10 years or so, and they are produced at higher levels without pressure support, there could be some reservoir damage.     But this risk is mitigated by the lower production demand on Iran, which eases the requirement of these fields to produce at higher volumes, said Wells.     Most of Iran's production falls into Category 4, where the only issues are managing gas production from the Pazanan field for gas injection and balancing the gas recycling.    (Reporting by Peg Mackey)  ((peg.mackey@thomsonreuters.com)(+44 207 542 7714)(Reuters Messaging: peg.mackey.thomsonreuters.com@reuters.net))  Keywords: IRAN OIL/CAPACITY