基于低场核磁共振的高阶煤平行与垂直层理结构特征  

Structure features of high rank coal in parallel bedding and vertical bedding based on low field nuclear magnetic resonance

作　　者：刘世奇[1] 桑树勋 杨延辉 刘书培 杜艺 王恬 方辉煌 LIU Shiqi;SANG Shuxun;YANG Yanhui;LIU Shupei;DU Yi;WANG Tian;FANG Huihuang(Jiangsu Provincial Key Lab of Coal Based CO 2 Capture and Geological Storage,Research Institute of Low Carbon Energy,China University ofMining and Technology,Xuzhou 221116,China;MOE Key Lab of Coal Bed Methane Resources and Formation Process,School of Resources andGeosciences,China University of Mining and Technology,Xuzhou 221116,China;PetroChina Huabei Oilfield Company,Renqiu 062552,China)

机构地区：[1]中国矿业大学低碳能源研究院江苏省煤基CO2捕集与地质存储重点实验室,江苏徐州221116 [2]中国矿业大学资源与地球科学学院煤层气资源与成藏过程教育部重点实验室,江苏徐州221116 [3]中国石油华北油田公司,河北任丘062552

出　　处：《煤炭科学技术》2018年第10期110-116,共7页Coal Science and Technology

基　　金：国家自然科学基金资助项目(41402135,41330638,41727801);江苏省基础研究计划(自然科学基金)面上资助项目(BK20171188);国家重点基础研究发展计划(973计划)资助项目(2009CB219608);中国石油重大科技专项资助项目(2013E-2205);国家留学基金资助项目(201706425014)。

摘　　要：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<500 nm would be stronger and thus would have the higher effective porosity and more strong cracking connection.The pore in a vertical bedding direction would be compressed more seriously.The cleat and micro cracks would be extended along the bedding direction of the seam.The continuity along the direction of the vertical bedding would be poor and would be the main causes of the high rank coal structure differences in the directions of the parallel bedding and vertical bedding.

关 键 词：孔隙度 连通性 孔径 微观裂隙 沁水盆地 核磁共振 

分 类 号：P618.11[天文地球—矿床学]