核磁共振自旋回波串确定渗透率方法探讨

On Permeability Determination with NMR Echo Trains.

孔隙大小和孔隙结构不仅是决定储层渗透率的主要因素 ,同时与核磁共振测井的自旋回波串和T2 分布有很好的对应性。根据我国东部某油田下第三系的岩心样品核磁共振实验 ,研究了核磁弛豫信号 (自旋回波串 )与岩石孔隙结构以及渗透率的对应关系 ,并且首次提出利用自旋回波串下包面积Ea 结合孔隙度和地层因素F确定地层渗透率的新方法 。

..abstarctPore size and pore texture are the main factors that determine reservoir permeability, correlated to echo trains and T 2 distribution of NMR logging. This article studies correlation of NMR signals (echo trains) with rock pore texture and permeability based on NMR laboratory core samples analysis in east of China, and develops a new method to estimate reservoir permeability using intrinsic area of echo trains ( E a), porosity (  ) and formation factor ( F ). This makes NMR logging evaluation of formation with low porosity and low permeability more simple and effective.