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利用核磁共振技术,对乌里雅斯太油田腾格尔III油层组(TIII)及阿尔善油层组37块低渗透砂砾岩储层岩样进行可动流体测试,测试结果与常规砂岩储层进行对比,分析可动流体百分数与渗透率和驱油效率的关系。研究结果表明,特低渗透砂砾岩储层可动流体含量较低,非均质性强;特低渗透砂砾岩储层的核磁共振特点与常规特低渗透砂岩储层有所不同,表现为特低渗透砂砾岩储层核磁共振T2谱单峰结构增多,T2截止值增大;可动流体百分数与渗透率有一定的相关性,且渗透率越大,相关性越好;对于不同油层组,可动流体平均含量随渗透率增大而增加;可动流体百分数越大,驱油效率越高;可动流体含量低是特低渗透砂砾岩储层开发效果不好的主要因素,可用可动流体百分数预测储层的开发效果。
Using NMR, the fluid samples of 37 low-permeability glutenite reservoirs in the Tulige III oil layer group (TIII) of the Ulyssestai oil field and the Alsian oil layer group were tested. The results are in good agreement with conventional sandstone reservoirs In contrast, the relationship between the percentage of mobile fluid and permeability and oil displacement efficiency was analyzed. The results show that the content of movable fluid in the ultra-low permeable glutenite reservoir is low and the heterogeneity is high. The NMR magnetic resonance characteristics of the ultra-low permeable glutenite reservoir are different from the conventional ultra-low permeability sandstone reservoirs, The T2 spectrum of low permeability sandstone conglomerate reservoir increases with the increasing of T2 spectrum and the T2 cutoff increases. The percentage of mobile fluid has some correlation with permeability, and the greater the permeability is, the better the correlation is. For different reservoirs, The average content of movable fluid increases with the increase of permeability. The larger the percentage of movable fluid, the higher the efficiency of displacement. The low content of movable fluid is the main factor for the poor development of ultra-low permeable glutenite reservoirs, Fluid percent predicts reservoir development effectiveness.