摘要
通过不同充注方式层内非均质砂层油运移和聚集的二维模拟实验表明:正韵律砂层中,不同非均质程度,即不同渗透率级差的砂层,在不同的充注方式和能量条件下,油气运移路径和通道与含油层位具有差异。当渗透率级差较小时,中部渗透率中等的砂层比下部渗透率大的砂层和上部渗透率小的砂层更容易成为油气运移路径和通道,成为含油层;当渗透率级差较大时,下部渗透率大的砂层比中部渗透率中等的砂层和上部渗透率小的砂层更容易成为油气运移路径和通道,为含油层。反韵律砂层中,渗透率级差较小时,上部渗透率大的砂层和中部渗透率中等的砂层比下部渗透率小的砂层更容易成为油气运移路径和通道,为含油层。在稳态充注条件下,侧向充注和断层充注含油层位基本相同,含油饱和度在垂向上表现为"韵律"特征;断层幕式充注下,含油面积更大,中等渗透率和大渗透率砂层均为含油层,且在大渗透率砂层中运移效率较高。
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.
出处
《中国石油勘探》
CAS
2008年第6期33-38,共6页
China Petroleum Exploration
基金
中国石化"十一五"重点科技攻关项目(P06016)资助
关键词
层内非均质性
实验模拟
渗透率级差
油气运移
interlayer heterogeneity
experiment modelling
permeability contrast
oil and gas migration
