Ultimate potential resource prediction and exploration target in East Depression, Baise Basin

The confirmed recoverable oil resource was estimated to be 37.59% in the East Depression of the Baise Basin. By means of reservoir scale sequence, the ultimate potential resource of the depression was predicted, indicating 35 reservoirs and 2 836×10⁴ t reserves remained to be discovered. 11 undiscovered reservoirs (total reserves 1 622×10⁴ t) had the reserves of more than 100×10⁴ t. 24 undiscovered reservoirs (total reserves 1 214×10⁴ t) had the reserves of less than 100×10⁴ t. The difference between predicted and actual oil reserves was less than 10%. The resources remained to be discovered mainly located in covered oil reservoirs in the Central Sag, delta sandbodies and beach-bar sandbodies in the Southern Slope, pre-Tertiary buried hill, glutenite and red bed in the steep slope and shale in the Nadu Formation.