低渗透油田储层综合评价方法

Comprehensive evaluation of reservoir in low-permeability oilfields

根据低渗透储层特点,利用恒速压汞、核磁共振、低渗透渗流理论和物理模拟实验研究手段,将喉道半径、可动流体百分数、启动压力梯度、有效驱动因子4个参数作为低渗透油储量的评价指标,建立了与之对应的分级评价方法和分级界限。同时以丰度、有效厚度、喉道半径、可动流体比率、启动压力梯度和有效驱动因子6个参数作为低渗透油田储量综合评价指标建立了评价新方法。该方法成功地应用于大庆油田外围低渗透储层评价,为低渗透储层的合理开发提供了理论依据。

The rate-controlled mercury injection, nuclear magnetic resonance, porous flow theory of low-permeability reservoir and physical simulation were used to evaluate the reserves of low-permeability reservoirs, taking throat radius, percentage of mobile fluid, start-up pressure gradient and effective drive factor as the evaluating indexes. The corresponding hierarchical appraisal method and hierarchical demarcation line were set up. A comprehensive method for evaluating the reserves of low-permeability reservoirs was proposed. For the new method, reservoir＇s abundance, effective thickness and throat radius, as well as the percentage of mobile fluid, start-up pressure gradient and effective drive factor are taken as the evaluating index. This method has been successfully applied to the evaluation of low-permeability reservoirs in Daqing peripheral oilfield.