闵4断块古近系阜宁组二段火山岩储集层裂缝研究

A Study on Volcanic Reservoir Fracture of Fu-2 Member of Paleogene in Min-4 Fault Block in Minqiao Oilfield

受构造应力场及岩石物性的影响与控制,火山岩储集层中裂缝最为发育。结合岩心裂缝描述,采用构造应力场数值模拟方法,预测了闵桥油田闵4断块阜二段火山岩储集层的裂缝参数。阜宁晚期强烈的构造运动导致了大量断裂的产生,裂缝在断层附近最为发育,走向以近北东东向为主。现今应力对裂缝具有改造作用,现今裂缝的开度、密度、孔隙度和渗透率等参数小于相应古裂缝参数,断块内部裂缝参数小于断层附近裂缝参数。

The fractural parameters of volcanic reservoir of Fu-2 Member of Paleogene in Min-4 fault block in Minqiao oilfield are predicted using tectonic stress field numerical simulation integrated with core fissure description. The study shows that lots of fractures occurred due to intense tectonic movement in Late Funing period, which were mainly distributing near the faults with trend of NEE. The present stress has modified effect on these fractures. The values of present fracture aperture, density, porosity and permeability are less than those of paleo-fractures, and the values of fracture parameters within the fault block are less than those of them near the faults.