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岩石物理岩石孔喉结构特征对核磁T2谱影响的数值模拟

机译:岩石物理岩石孔喉结构特征对核磁T2谱影响的数值模拟

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本文建立了能够考虑孔喉特征的储层岩石三维非规整网络模型,用数值模拟方法进一步研究饱含水岩样的核磁T2谱特征.通过模拟储层岩石孔喉核磁共振T2谱的特征,表明核磁共振T2谱同岩心孔喉半径分布具有很好的相似性,对T2谱中孔隙体、喉道信号的分解可以评价储层岩石孔隙体、喉道的半径大小及分布情况.分别模拟喉道半径、孔喉比以及孔隙连通性等孔隙结构特征对T2谱的影响,发现:1.随着喉道半径的增大,T2谱峰值向右移动,而且峰值处的驰豫信号强度增大:2.随着孔喉比的增大,T2谱峰值向右移动,峰值处的驰豫信号强度增大,而且孔隙体T2谱和喉道T2谱逐渐分开:3.随着连通性的增大,曲线左端上升,短驰豫时间信号所占比列增大,右边的峰值有所降低.%We built a three-dimensional irregular network model which can adequately describe reservoir rock pore-throat structures. We carried out numerical simulations to study the NMR T2distribution of water-saturated rocks. The results indicate that there is a good correlation between T2distribution and the pore radius frequency histogram. The total T2distribution can be partitioned into pore body and pore throat parts. The effect of parameters including throat radius, pore-throat ratio, and coordination number of the micro-pore structure on the T2distribution can be evaluated individually. The result indicates that: 1) with the increase of the pore throat radius, the T2distribution moves toward longer relaxation times and its peak intensity increases; 2) with the increase of the pore-throat ratio, the T2 distribution moves towards longer T2with the peak intensity increasing and the overlap between pore body T2and pore throat T2decreasing; 3) With the increase of connectivity, the short T2component increases and peak signal intensity decreases slightly.
机译:本文建立了能够考虑孔喉特征的储层岩石三维非规整网络模型,用数值模拟方法进一步研究饱含水岩样的核磁T2谱特征.通过模拟储层岩石孔喉核磁共振T2谱的特征,表明核磁共振T2谱同岩心孔喉半径分布具有很好的相似性,对T2谱中孔隙体、喉道信号的分解可以评价储层岩石孔隙体、喉道的半径大小及分布情况.分别模拟喉道半径、孔喉比以及孔隙连通性等孔隙结构特征对T2谱的影响,发现:1.随着喉道半径的增大,T2谱峰值向右移动,而且峰值处的驰豫信号强度增大:2.随着孔喉比的增大,T2谱峰值向右移动,峰值处的驰豫信号强度增大,而且孔隙体T2谱和喉道T2谱逐渐分开:3.随着连通性的增大,曲线左端上升,短驰豫时间信号所占比列增大,右边的峰值有所降低.%We built a three-dimensional irregular network model which can adequately describe reservoir rock pore-throat structures. We carried out numerical simulations to study the NMR T2distribution of water-saturated rocks. The results indicate that there is a good correlation between T2distribution and the pore radius frequency histogram. The total T2distribution can be partitioned into pore body and pore throat parts. The effect of parameters including throat radius, pore-throat ratio, and coordination number of the micro-pore structure on the T2distribution can be evaluated individually. The result indicates that: 1) with the increase of the pore throat radius, the T2distribution moves toward longer relaxation times and its peak intensity increases; 2) with the increase of the pore-throat ratio, the T2 distribution moves towards longer T2with the peak intensity increasing and the overlap between pore body T2and pore throat T2decreasing; 3) With the increase of connectivity, the short T2component increases and peak signal intensity decreases slightly.

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