关键词: 层内非均质性, 实验模拟, 渗透率级差, 油气运移

Abstract: 2D stimulated experiment on oil migration and accumulation in interlayer heterogeneous sands is carried out by taking different filling ways. It is shown that the routes of oil and gas migration and oil zones vary a lot from upward sands with different heterogeneity, i.e., different permeability contrast, under different filling ways and energy conditions.When the permeability contrast is small, the sands with medium permeability in the middle tend to become the oil layers and the routes for oil and gas migration, as compared with the sands with high permeability in the lower part and the sands with low permeability in the upper part. When the permeability contrast is big, the sands with high permeability in the lower part will become the oil layers and the routes for oil and gas migration, as compared with the sands with medium permeability in the middle and the sands with low permeability in the upper part. Under steady conditions, oil zones are the same by the ways of lateral filling and fault filling, the oil saturation features in "rhythm" vertically. Under fault episode filling conditions, oil area gets larger, sands with medium and high permeability become oil beds, and the migration efficiency in high-permeability sands gets higher.

Key words: interlayer heterogeneity, experiment modelling, permeability contrast, oil and gas migration