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致密储层束缚水膜厚度分析

Keywords: 致密储层,束缚水膜厚度,核磁共振,高速离心,低温吸附

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Abstract:

?针对塔里木盆地和鄂尔多斯盆地致密储层岩心平行样,分别进行气水高速离心核磁分析和低温吸附实验,定量获得每块岩心总束缚水饱和度、岩石比表面积及微孔隙百分数等参数,综合各参数建立储层束缚水膜厚度分析方法。结果表明:结合气水高速离心核磁分析和低温吸附实验等技术,可有效区分毛细管束缚水和水膜束缚水,为准确计算束缚水膜厚度提供了新方法|利用该方法计算获得的致密储层岩心束缚水膜厚度分布范围为4.92~38.94nm,平均值为12.88nm,小于传统渗透率较高储层束缚水膜厚度为50nm左右的认识。渗透率越小储层束缚水膜相对越厚,有效渗流喉道半径和可流动孔隙空间越小,边界层影响越大,储层流体渗流非线性特征越显著。

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