The
Relationship Between Recovery Efficiency and
Depositional Setting in a Deltaic Plain Environment
Shoup, Robert C.1
(1) Consultant, Houston, TX
A Full Field Review was conducted for a
structurally and stratigraphically complex field
offshore Sarawak. The East portion of
the field is a relatively simple, west-plunging flower-structure fold. The West
portion of the field consists of a series of normal conjugate faults that
formed in response to tensional bending over a deep-seated normal basement
fault. These faults result in the severe compartmentalization of the western
portion of the field. There are over 20 separate reservoirs in the field,
comprising both channel sands and incised valley fill sequences that were
deposited by a generally westward flowing river system. The eastern portion of
the field was situated in the upper deltaic plain where deposition was from a
fluvial environment, whereas the depositional setting for the western portion
of the field was the lower deltaic plain estuarine setting. Production from the
fluvial reservoirs in the eastern portion of the field exhibit little to no
aquifer support and recovery efficiencies range from 20 to 35%. Production from the estuarine reservoirs in the western portion of
the field have significant aquifer support, and recovery efficiencies
range from 35 to 50%.