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低阻油气层是一种非常规储层,其油气层电阻率与邻近水层电阻率接近,或有时低于水层的电阻率。试油证实在苏北盆地溱潼凹陷阜宁组阜三段存在着低电阻率油气层,但其成因机理一直没有得到很好的认识。应用扫描电子显微镜、X-射线衍射等现代化实验技术,对其储层岩石学特征、粘土矿物类型、含量及分布、孔隙结构特征、地层水矿化度等方面进行深入研究。研究表明形成溱潼凹陷阜宁组阜三段储层低阻的原因是:高束缚水饱和度、粘土附加导电性、高地层水矿化度。根据形成低阻油层的地质条件分析及导电机理研究认为,对于低阻油层的测井解释评价,应主要针对高含束缚水成因的低阻油层,在评价方法上应主要考虑采用“双水模型”;对于低阻油层的分布预测,应考虑在沉积相的弱水动力沉积区寻找低阻油层的富集分布。
Low-resistivity reservoirs are unconventional reservoirs with hydrocarbon resistivity close to, or sometimes lower than, the resistivity of adjacent aquifers. Oil tests confirmed that there are low resistivity reservoirs in the Fu-3 Member of the Funing Formation in the Qintong Depression of the Northern Jiangsu Basin, but the genesis mechanism has not been well understood. By means of modern experimental techniques such as scanning electron microscopy and X-ray diffraction, the characteristics of reservoir petrology, clay mineral types, content and distribution, pore structure characteristics and formation water salinity are studied in depth. The research shows that the reason for the formation of low resistance of the Fu-3 Member of the Funing Formation in the Qintong Depression is: high irreducible water saturation, additional conductivity of the clay and high salinity of formation water. According to the geological conditions analysis and conductive mechanism of formation of low resistivity reservoirs, it is considered that the logging interpretation and evaluation of low resistivity reservoirs should mainly be aimed at low resistivity reservoirs with high irreducible water content. In the evaluation method, Model ". For the prediction of the distribution of low-resistivity reservoirs, the distribution of low-resistivity reservoirs should be looked for in the weak hydrodynamic sedimentary facies of sedimentary facies.