熊健,唐俊方,周雪,刘向君,梁利喜

• 1:西南石油大学油气藏地质及开发工程国家重点实验室

摘要(Abstract)：

润湿性是储层岩石表面重要的物理性质之一，是影响毛细管力、相对渗透率、束缚水饱和度以及流体微观分布的关键因素。基于分子模拟方法，研究了含氧官能团修饰的石墨表面(有机质表面)润湿行为及甲烷-水体系在有机质狭缝孔中的分布特征。结果表明：随着含氧官能团的增多，水分子与有机质表面间相互作用能减小，有机质表面润湿接触角增大；随着温度的升高，有机质表面与水分子间的相互作用能增大，润湿接触角减小；在对称C/O比的石墨狭缝孔模型中，水分子对称分布在含氧官能团化的石墨壁面附近区域，且随着C/O比的减小，水分子的相对浓度增大、扩散系数减小，而甲烷分子则聚集分布在孔中心区域；在不对称C/O比的石墨狭缝孔模型中，水分子不对称分布在含氧官能团化的石墨壁面附近区域，而甲烷分子仍聚集分布在孔中心区域，其中C/O比低的一侧，壁面亲水性强，水分子的相对浓度高，而C/O比高的一侧，壁面疏水性强，水分子的相对浓度低。研究结果对于页岩储层特征影响研究有重要的意义。

关键词(KeyWords)： 甲烷;有机质;含氧官能团;润湿性;气水分布;石墨

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41772151;41872167);; 西南石油大学青年科技创新团队(2018CXTD13)

作者(Author): 熊健,唐俊方,周雪,刘向君,梁利喜

DOI: 10.19509/j.cnki.dzkq.tb20210633

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