Greater Burgan Field: defining the Wara Formation reservoir architecture
Study aims: to refine the stratigraphic and depositional model, and to determine the reservoir architecture and heterogeneities.
Database: evaluation of >120 cored wells at various levels of detail calibrated with wireline logs and integrated with bio/chemostratigraphy and data from 3 partly cored imaged wells.
Approach: application of a hierarchical approach to description, with detailed core description and core-log calibration allowing interpretation of various genetic elements, major changes in depositional evolution and key surface definition for full-field sequence stratigraphic correlation.
Integrated results: definition of three SW/W to NE/E oriented sand-dominated incised valleys cutting into brackish bay deposits.
Upward-fining/muddying composite valley fill is associated with an upward reduction in permeability.
Complex internal make-up, but valley fills typically evolve up from channel-fill to heterolithic channel-fills to rare in-channel sandsheets and abandonment/floodplain deposits.