关键词: 盆地模拟, 二次运移, 三维三相模型, 满加尔坳陷, 含油气系统

Abstract: A 3-D and 3-phase (water-oil-gas) model of hydrocarbon secondary migrationis is presented.It is applicable to the exploration area where there exist quite a few wells drilled and seismic sections,and has some distinctive advantages to present the quantity and distribution of hydrocarbon accumulation in the 3-D time and space that 1-D and 2-D models could not reach.This model is mainly based on the principles of continuity equation,flow potential,Darcy's Law,equations of state,and also in view of the major driving forces of sedimentary compaction,hydrocarbon expulsion,fluid potential, buoyancy and capillary pressure, etc.and the effects of lithology,fault,fracture and unconformity on hydrocarbon migration and accumulation.The software of the model performs the true 3-D simulation and true 3-D visualization and can historically supply the various maps for the potentials, pressures, saturations, migration velocities and streamlines of water,oil and gas,as well as the quantity and distribution of hydrocarbon accumulation.Moreover, the three solutions of finite difference,finite element and finite volume are discussed.This model has been successfully applied to Manjar Depression.The simulation results are consistent with the real situation. Some favorable prospects have been proved by recent explorations.

Key words: basin modeling, secondary migration, three-dimension and three-phase model, Manjar Depression, petroleum system