Abstract:

In consideration of the conglomerate reservoir which possesses continuous oil column over 800m and the highly heterogeneity of lithology. phisical pro-perty and oil saturation, two equations confining the extend of capillary effectare derived ftom Berg's capillary pressure limit equation and the data of thisoil pool: equation superiores is Zo 1=2.25(10/r_t-2) and equation of inferiores limit is Zo 2=0.96(10/r_t-2). Double logarithmic graph indicating the relation-chip between the height of oil column and the radius of throat are given by theequation. The inferiores limit of throat radius in seal rock and that of effective porosity are determined as 0.01μm and 0.025μm respectively. Based on the conception of pore group, capillary pressure data of mercury-injection, and k,ω and λ from the analysis of well test data, four types of reservoirs, i.e. the good (1), mediocre (2), poor (3), and non (4). are quantitativelyclassified and evaluated. These results indicate that the depth of oil-water boundary in production in type 1 mainly comprising dissolved pore group is 200 m lower than that in type 3 which has large amounts of fine micropore groups (the everage depth of oil-water boundary in the pool is about 3000m ) .Finally, the authors suggest that, the conglomerate of the P₂u¹⁺² subformation in the Lower Wuerhe Formation is the covering strata, the dispersed lens as partition beds within the reservoir may not stop hydrocarbon from migrating. Though there are plenty of fracturer in conglomerate near the huge Karamay-Wuerhe fault, but all of these fractures are completely filled up to become a non-reservoir or a side-sealed reservoir.