| 核磁共振T2谱拐点位置分段的伪毛细管压力曲线计算 |
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| 引用本文： | 曹先军,侯学理,陈江浩,孙佩,王雷,冀昆.核磁共振T2谱拐点位置分段的伪毛细管压力曲线计算[J].测井技术,2020(3):245-250. |
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| 作者姓名： | 曹先军 侯学理 陈江浩 孙佩 王雷 冀昆 |
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| 作者单位： | 中国石油集团测井有限公司技术中心 |
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| 基金项目： | 中国石油天然气集团有限公司项目“iMRT核磁共振测井仪优化与研制”(2019B-3708)。 |
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| 摘 要： | 为了进一步提高非线性分段幂函数法的计算精度以及将该方法用于单峰T2谱,提出基于核磁共振T2谱拐点位置(非T2谱谷值)分大、中、小孔3段的幂函数法,该方法同时适用于单峰T2谱和双峰T2谱。将计算结果与压汞实验结果对比,新方法拓展了幂函数法的应用范围,提高了计算精度,使得无论是单峰T2谱还是双峰T2谱转换后的伪毛细管压力曲线与实测毛细管压力曲线都能吻合得非常好,为利用核磁共振测井T2谱进行精确的岩石孔隙结构评价奠定了基础。
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| 关 键 词： | 核磁共振测井 伪毛细管压力曲线 孔径分布曲线 T2谱 拐点 分段幂函数 |
A Piecewise Calculation Method of Pseudo Capillary Pressure Curve Based on the Inflection Point of the NMR T2 Spectrum |
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| CAO Xianjun,HOU Xueli,CHEN Jianghao,SUN Pei,WANG Lei,JI Kun.A Piecewise Calculation Method of Pseudo Capillary Pressure Curve Based on the Inflection Point of the NMR T2 Spectrum[J].Well Logging Technology,2020(3):245-250. |
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| Authors: | CAO Xianjun HOU Xueli CHEN Jianghao SUN Pei WANG Lei JI Kun |
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| Affiliation: | (Technology Center, China Petroleum Logging CO. LTD., Xi’an, Shaanxi 710077, China) |
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| Abstract: | In order to improve the calculation accuracy of the non-linear piecewise power function method and apply it to unimodal T2 spectrum,a new piecewise calculation method is proposed,which divide the T2 spectrum into three sections based on its inflection point.This method is applicable to bimodal and unimodal T2 spectrum.The comparison of the calculation and the mercury injection experiment shows that the new method expands the scope of application,improving the calculation accuracy.Both the pseudo capillary pressure curves from unimodal and the bimodal T2 spectrum fit the mercury injection experiment well.It lays a foundation for accurate evaluation of rock pore structure by NMR T2 spectrum. |
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| Keywords: | nuclear magnetic resonance logging pseudo capillary pressure curve pore size distribution curve T2 spectrum inflection point piecewise power function |
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