卢振东,刘成林,臧起彪,吴育平,杨熙雅,阳宏,曾晓祥,李闻达

• 1:中国石油大学(北京)油气资源与探测国家重点实验室
• 2:中国石油大学(北京)地球科学学院

摘要(Abstract)：

孔隙结构是致密砂岩储层的关键要素，制约油气在储层中的储集与流动，而储层孔隙结构是目前非常规油气勘探开发研究的重点和难点。选取鄂尔多斯盆地合水地区上三叠统延长组长7段10块致密岩心样品，开展高压压汞和X-衍射等实验，运用分形理论研究储层孔喉分形特征，并分析分形维数与储层物性、孔隙结构参数与矿物含量之间的关系。研究结果表明：根据压汞曲线形态和孔隙结构参数将储层分为Ⅰ、Ⅱ、Ⅲ类，其储集性能和渗流能力依次递减，微观非均质性依次增强。不同类型的储层具有不同的分形特点：根据分形曲线存在的拐点0.05和0.02μm,将实际情况和IUPAC提出的孔隙大小划分标准结合，Ⅰ类储层孔隙分为大孔(>50 nm)和中孔(50～6 nm);Ⅱ、Ⅲ类储层据拐点分为中孔A段(50～20 nm)和中孔B段(20～6 nm);平均分形维数依次增大，分别为2.619 3,2.745 4,2.852 6,非均质性逐渐增强。较少的大孔贡献了主要的渗透率，分形维数反映的主要是孔隙大小非均质性。分形维数与部分矿物存在较好的相关性，矿物成分及其含量是决定分形维数大小的内在因素，进而影响储层的质量和孔隙结构特征。

关键词(KeyWords)： 高压压汞;致密砂岩;孔隙结构;分形维数;非均质性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41872127)

作者(Author): 卢振东,刘成林,臧起彪,吴育平,杨熙雅,阳宏,曾晓祥,李闻达

DOI: 10.19509/j.cnki.dzkq.tb20210203

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