A Study of Tilted Oil-water Contact in Sarvak Calcareous Reservoir of Civand Oil Field in the Persian Gulf

Determining the position of the oil-water contact (OWC) and improving the understanding of tilted OWC in fields help to explain risk analysis and development drilling. Oil-water contact has been defined in all wells of Civand (Sirri C) field utilizing petrophysical logs and confirmed using RFT data. Tilted oil-water contact has been established and presented in the field after providing isovalue map of OWC and using well correlation map in different directions. The oil-water contact has been tilted close to 0. 5 degrees westward. According to the results، the OWC tilting associated to hydrodynamic flow in Sarvak (Mishrif) aquifer in the east and west directions is a reliable indicate; moreover، because the petrophysical characterization of reservoir rock (porosity and permeability) is better in the west part of the field than the other side، transition zone thickness is decreased and oil-water contact level is increased.