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W油藏Z1油组为高孔低渗低阻油藏,低阻油层的地质成因复杂多样。依据Z1油组储层发育特征,研究了储层粘土矿物的类型、颗粒的分布形式和泥质含量,以及上述粘土矿物特征对Z1油组低阻的影响。研究发现,Z1油组低阻层段的粘土类型以伊蒙混层为主,其相对含量高;粘土颗粒较均匀地成薄膜状、絮状分布;平均泥质含量高。粘土矿物组构产生的附加导电性和高泥质含量是影响Z1油组低电阻率的重要因素之一。
Reservoir Z1 is a high-porosity, low-permeability and low-resistance reservoir. The geological causes of low-resistance reservoirs are complex and diverse. Based on the reservoir development characteristics of reservoir Z1, the types of clay minerals, the distribution pattern of particles and the content of shale, and the influence of clay mineral characteristics on the low resistance of Z1 oil group are studied. It is found that the clay types in the low-resistivity layer of Z1 oil group are dominated by Yimeng mixed layer, and their relative contents are high. Clay particles are evenly distributed into thin film and flocculent distribution with high average clay content. The additional conductivity and high mud content of clay mineral fabric are one of the important factors that affect the low resistivity of Z1 oil group.