1.Jiangsu Provincial Key Lab of Coal Based CO2 Capture and Geological Storage, Research Institute of Low Carbon Energy,China University of Mining and Technology, Xuzhou , China;2.MOE Key Lab of Coal Bed Methane Resources and Formation Process, School of Resources and Geosciences,China University of Mining and Technology,Xuzhou , China;3.PetroChina Huabei Oilfield Company, Renqiu ,China

为提高对煤层气水平井开发中流体运移、产出的认识，以沁水盆地南部高阶煤为研究对象，基于低场核磁共振试验，探讨了平行层理与垂直层理方向高阶煤储层结构特征，并进一步阐述了平行层理与垂直层理方向煤储层结构差异的原因。结果表明，平行层理与垂直层理方向高阶煤具有相似的孔径分布特征；平行层理方向高阶煤孔隙度略低于垂直层理方向，但大孔与微观裂隙之间，以及中孔和孔径<500 nm的大孔之间连通性更强，使其具有更高的有效孔隙度和更强的孔裂隙连通性。垂直层理方向孔隙被压扁更严重，割理和微观裂隙沿煤层层理方向延伸，垂直层理方向连续性差，是平行层理与垂直层理方向高阶煤结构差异的主要原因。

In order to improve the understanding of the fluid migration and output in the development of the coalbed methane horizontal well, with the high rank coal in the south part of Qinshui Basin as a study object, based on low field nuclear magnetic resonance test, the paper had a discussion on the structure features of the high rank coal reservoir in the parallel bedding and vertical bedding directions and had a further statement on the causes of the coal reservoir structure differences in the parallel bedding and vertical bedding directions. The results showed that the high rank coal in the parallel bedding and vertical bedding directions would have similar pore diameter distribution features. The porosity of the high rank coal in the parallel bedding direction would be lower than in the vertical bedding direction. But the connectivity between the big pores and micro cracks as well as between the medium pore and the big pore with a pore diameter of