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2DNMR在泥页岩物性及流体评价中的应用探讨

, PP. 206-213

Keywords: 低场核磁共振(low-fieldNMR),二维磁共振(2DNMR),泥页岩,纳米级孔隙,流体类型和含量

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Abstract:

纳米级孔隙、非达西渗流、自生自储是泥页岩油气层的主要特征,常规NMR技术难以检测到T2弛豫时间短于0.1ms的纳米级孔隙,并难以准确评价泥页岩储层中的孔隙流体性质与含量.为了解决以上问题,以济阳坳陷下第三系沙河街组泥页岩油气主要勘探层段为研究对象,采用高分辨率2DNMR技术对采自3口井的11块泥页岩样品分别进行1D、2DNMR分析.结果表明,T2谱能够检测到泥页岩中的全部孔隙量;D-T2谱能够准确评价孔隙流体类型与含量,且核磁含油饱和度与石油的产液量、岩石热解的液态烃量具有可对比性.该项研究对精细评价泥页岩油气储层具有十分重要的意义,对进一步发展高分辨率2DNMR技术具有一定的促进作用.

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