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针对伊拉克H油田碳酸盐岩储层较强的非均质性,本文利用岩心资料研究了M2组颗粒灰岩与泥粒灰岩的孔隙结构特征,并详细分析了M2组下段油层低阻的成因.根据实验得到的孔喉半径分布曲线划分的大孔、中孔和小孔的累计比例,把储层划分为大、中、小三种孔隙结构,结果表明M2组上段颗粒灰岩以大孔和中孔为主,下段泥粒灰岩以中孔和小孔为主.压汞毛管压力曲线表明下段的非均质性强于上段.找出了以中、小孔为主孔隙结构及其复杂的润湿性是造成M2组下段油层低电阻率的原因.用毛管孔径划分的三种孔隙结构刻度了核磁T2谱,结果显示毛管孔径划分的三种孔隙结构与核磁T2谱划分的三种孔隙具有很好的一致性,岩心渗透率与核磁得到的渗透率也具有很好的一致性,找到了用核磁资料准确评价储层的孔隙结构的一种有效途径.
In view of the strong heterogeneity of carbonate reservoir in Iraq H oilfield, the pore structure characteristics of grain limestone and limestone in Group M2 are studied by using core data. The characteristics of low resistivity According to the cumulative pore-throat radius distribution curve obtained experimentally, the cumulative ratio of macropores, mesopores and small holes, the reservoir is divided into three types of pore structure: large, medium and small pore structure, the results show that the upper M2 group of large particles of limestone And mesopores, and the lower part of the mudstones are mainly mesopores and small pores.The capillary pressure curve of mercury injection shows that the heterogeneity of the lower part is stronger than that of the upper part, and the pore structure dominated by medium and small pores and its The complex wettability is the reason of the low resistivity of the lower M2 formation.The three T2 structures partitioned by the capillary aperture were used to calibrate the T2 magnetic resonance spectroscopy and the results showed that there are three pore structures divided by capillary pore size and T2 The porosity has good consistency. The core permeability and permeability obtained by NMR are also in good agreement. It is an effective way to accurately evaluate the pore structure of reservoirs with NMR data.