EOR Option for a Heterogeneous Carbonate Reservoirs with Complex Waterflood Performance

An integrated study has been carried out to understand the field performance and remaining oil distribution<br>of a heterogeneous and oil-wet carbonate reservoir under waterflood. The reservoir under study is a<br>layered system where strata measuring a few feet in thickness can be correlated field-wide. The reservoir<br>consists of two main units, i.e. a Lower zone of generally low permeability layers and an Upper zone of<br>high permeability layers inter-bedded with low permeability layers; the average permeability of the Upper<br>zone is some 10-100 times higher than that of the Lower zone.