Geochemical Study of Hydrocarbon Fluid Inclusions in Drilled Wells of Mansuri Oil Field

Fluid inclusions are closed capsules wich have retained fluid information completely since their entrapment time. These important fluid information parameters are temperature and fluid composition. Geochemical study of fluid inclusions from Mansuri oil field using microthermometry analysis investigates application of fluid inclusion properties. Analytical results indicated that Bangestan Formation is a potential hydrocarbon reservoir. Hydrocarbon-bearing fluid inclusion was noticed only in one well (MI_44E) from Mansuri oil field, and therefore detailed investigation is proposed. Detailed sample analyses resulted in identification of 3 types of fluid inclusion generation with distinct characteristics. All fluid inclusions are described as primary in origin, but they show subtle differences in terms of cement type, temperature of homogenization and salinity. Oil inclusions were noticed only in type 3 generation which is described by varied API Gravity with yellow to blue colors suggesting mature oil (93.1◦C), salinity in the range of 11.46 to 18.47 % at depth 3425.9 meter. Finally, it is concluded that only Ilam reservoir from Bangestan group would possibly be favorable to exploration and field development.