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运用岩芯观察统计及地应力场有限元数值模拟方法,基于应变能、表面能理论,采用格里菲斯岩石破裂准则,建立古、今裂缝参数计算模型,预测了闵桥油田阜二段低渗透砂岩储层裂缝密度、开度、孔隙度、渗透率等参数。研究发现,闵桥油田阜二段构造裂缝在阜宁晚期古地应力场中产生,在断裂带附近最为发育,走向以北东东向与北西西向为主。现今地应力对裂缝具有改造作用,裂缝参数高值区主要位于构造高部位,工区南部闵35断块裂缝最为发育,裂缝线密度约为1.5条/m,开度约为0.84mm,孔隙度约为0.26%,东西向渗透率约为94.00mD。受裂缝自身发育方向影响,裂缝南北向渗透率最小,低于5.00mD。
Based on the theory of strain energy and surface energy and using Griffith’s rock failure criterion, the calculation model of ancient and present crack parameters was established by using the method of finite element simulation of core observation statistic and stress field. Infiltration sandstone reservoir fracture density, opening, porosity, permeability and other parameters. It is found that the structural fractures of Fu-2 Member in Minqiao Oil Field are generated in the paleo-earth stress field of the late Funing Period, and are most developed near the fault zone, with the main strike in the direction of NE and NE direction. Nowadays, the stress of the earth has the effect of rebuilding the fractures. The high values of the fractures are mainly located in the high tectonic parts. The Min 35 block in the southern part of the work area has the most developed fractures. The linear density of the fractures is about 1.5 / m, the opening is about 0.84 mm, 0.26%, east-west permeability of about 94.00mD. Affected by the development direction of the fractures, the permeability in the north-south fractures is the smallest, which is lower than 5.00mD.