Table 2: Root Mean Squared Error of the grid and oil production data for simple two facies model.

Root Mean Squared Error	Grid	Oil Rate
Standard EnKF (2 Wells)	336 md	W-1: 188 BOPD W-2: 207 BOPD
RCL EnKF (2 Wells)	229 md	W-1: 106 BOPD W-2: 137 BOPD
RCL EnKF (6 Wells)	189 md	W-1: 73 BOPD W-2: 58 BOPD W-3: 100 BOPD W-4: 53 BOPD W-5: 26 BOPD W-6: 84 BOPD