平湖油气田古近系花港组低阻油层成因与识别分析

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。通过对花港组H5砂层组的岩石类型、颗粒大小、粘土矿物的成分及其分布、孔隙结构、润湿性、地层水矿化度进行研究 ,表明该砂层组低阻的原因主要是由于高束缚水饱和度及高地层水矿化度引起的。

The Identification and Reseasons of Low Resistivity Oil Formations in Huagang Formation of Paleogene in Pinghu Oil Field

Low-resistivity reservoir is abnormal. Its resistivity of pay zones is usually close to or sometimes lower than that of adjacent water-bearing zones. On the basis of research rock's type, granularity, clay mineral's ingredient and distribution, pore texture, water affinity and concentration of formation water of the fifth section in Huagang Formation, it's found that the most important factors causing low resistivity of pay zones are higher irreducible water saturation and high concentration of formation water. The chief reasons of the low resistivity oil formation are high action exchange, high irreducible water saturation and high salinity water etc. The methods of interpretation are best to identify low resistivity oil formations that in common use are introduced. More parameter network interpretation method is the best.