陆相断陷湖盆油藏微观流场演化规律及演变机理

Evolvement law and mechanism of microcosmic flow field in continental faulted basin

利用对比井在不同含水期岩心的分析化验和物理模拟试验,研究了陆相断陷湖盆内不同类型储层在不同含水期内微观参数的变化特征,并揭示了其演变机理。研究结果表明,在陆相断陷湖盆中发育的不同成因类型储层的微观流场参数随油田含水率的提高发生各自有规律的变化,微观骨架场中颗粒支撑方式由紧密变松散、粘土矿物和地层微粒含量逐渐减少和局部富集,微观孔喉网络场的非均质性增强,渗流场中控制流体流动能力的参数变好,储层岩石的亲油性减弱,而其变化机理相同。

The physical simulative experiment and core analysis of contrast wells in different development stage were used to illustrate different type of reservoirs in continental faulted basin. The variable features of parameters in the different development stage of microcosmic reservoir were investigated, and the evolvement mechanism of microcosmic reservoir was revealed. The parameters in flow field of microcosmic reservoirs with different origin developed in continental faulted basin changed regularly with increment of water cut in oil field. The propping manner of granule in microcosmic skeleton field turned from close type into the unconsolidated one. The content of clay mineral and small particle in strata was reduced gradually and enriched in local area. The heterogeneity of microcosmic pore throat network field was enhanced. The parameters for controlling the ability of fluid flowing in seepage field were better. The lipophilicity of reservoir rock was weakened. The changing mechanism of lipophilicity of reservoir rock was unchangeable.