Exploitation mode oriented heavy oil-oil sand recoverable reserves calculation methods

Based on special exploitation mode of heavy oil-oil sand, this paper established a recoverable reserves calculation method for heavy oil-oil sand. First, calculate recoverable reserves of single exploitation mode according to oil layer selection criterion including four parameters of buried depth, single layer thickness, porosity and oil saturation for different exploitation models. Second, calculate recoverable reserves for different exploitation model combination and the max recoverable reserves of the block; Last, set up heavy oil-oil sand recoverable reserves database. The method has great correlation with PRMS reserves evaluation system. The method has been used in the heavy oil classification evaluation for larger M of the J block in Venezuela heavy oil belt, the recoverable reserves are 4.06×108 t, 15.23×108 t and 7.40×108 t respectively by cold production, steam drive and steam-assisted gravity drainage, and the max recoverable reserves are 15.97×108 t, which provides reserves basement for block development.