一种测定煤储层水相赋存空间的新方法  

A new method to investigate water occurrence space in coals

作　　者：张学英 杨延辉 张雅兰 冯其红 张纪远[2,3] 张斌 ZHANG Xueying;YANG Yanhui;ZHANG Yalan;FENG Qihong;ZHANG Jiyuan;ZHANG Bin(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)),Ministry of Education,Qingdao 266580,China;School of Petroleum Engineering in China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛266580 [3]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《中国石油大学学报（自然科学版）》2024年第5期122-128,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(51904319);教育部自主创新科研计划项目(21CX06029A)。

摘　　要：提出一种基于扫描电子显微镜和能谱分析相结合的含气煤样水相空间分布特征测试方法,采用新方法开展沁南盆地高阶煤样品水相赋存特征试验。结果表明:测试结果与核磁共振试验结果吻合性较好,验证了新方法的可靠性;煤岩微孔(孔径小于2 nm)和介孔(孔径为2~5 nm)多为疏水性壁面,水相在毛管阻力作用力影响下难以进入孔径约20 nm以下的孔隙和裂隙中;与现有核磁共振试验等方法相比,新方法具有测试流程简便、成本低廉等优势。In order to reveal the occurrence characteristics of water phase in nanoscale pores of coal reservoir,a novel test method based on scanning electron microscope(SEM)and energy spectrum analysis was proposed.The results obtained using the new method were consistent with those acquired from online nuclear magnetic resonance spectroscopy(NMR)experiments under the same experimental pressure.The wall in micro-pores(aperture less than 2 nm)and meso-pores(aperture of 2-5 nm)of coal rock is mostly with hydrophobic surface that makes water phase hard to access pores with diameters less than 20 nm under the influence of interfacial forces.Compared with the existing online NMR experimental method,the new method has the advantages of simple testing process and low cost,which can be also applied in different types of oil and gas reservoirs.

关 键 词：煤储层 气水赋存 扫描电子显微镜 能谱分析 示踪剂 核磁共振 

分 类 号：TE132[石油与天然气工程—油气勘探] P168.11[天文地球—天文学]