宝浪油田低渗含裂缝储层数值模拟

NUMERICAL SIMULATION OF LOW-PERMEABLE RESERVOIR WITH FRACTURES IN BAOLANG OILFIELD

为了准确模拟和预测低渗含裂缝储层的油水分布，首先采用多界面和流动单元约束方法建立了低渗基质单元属性三维地质模型，然后采用连续等效渗透率和离散等效渗透率的复合模型建立了裂缝单元属性三维地质模型。裂缝高发育区、裂缝中等发育区和裂缝低发育区的等效渗透率分别为169×10-3μm 2、38×10-3μm 2和23×10-3μm 2，离散等效裂缝介质渗透率为200×10-3～4 000×10-3μm 2，区块历史拟合符合率为90％，单井历史拟合率为76％。结果表明：采用该复合模型能够很好地表征低渗含裂缝储层的渗流介质模型；数值模型区块和单井历史拟合符合率高；得出的剩余油分布能够客观地反映裂缝对流体流动规律的影响。

In order to correctly analyze and predict oil and water distribution of low-permeable reservoir with frac- tures, firstly, the constraint method of multi-interfaces and flow units is adopted to set up 3D geologic model of low- permeable matrix unit, and then composite model of continuous equivalent permeability and discrete equivalent per- meability is adopted to establish 3D geologic model with the property of fracture unit. Equivalent permeability in fracture much development area, medium development area and less development area are 169 ×10-3μm2, 38 ×10-3μm2 and 23 ×10-3μm3 , respectively. Permeability of equivalent fracture media is 200 ×10-3- 4 000 ×10-3μm2 coincidence rate of history matching of block is 90% and history matching ratio of single well is 76%. The results indicate that flow media model of low-permeable reservoir with fractures can be better characterized by using this composite model ; with high coincidence rate of history matching for numerical simulated block and single well. Obtained remaining oil distribution can objectively reflect the effects of fractures on fluid flow rules.