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Petrophysical characterization of Chinese coal cores with heat treatment by nuclear magnetic resonance

机译：核磁共振热处理对中国煤芯的岩石物理表征

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摘要

For the past decades the nuclear magnetic resonance (NMR) technology has gained acceptance as a petrophysical tool for evaluating reservoir properties. Comprehensive reservoir evaluation requires determination of irreducible fluids, movable fluids and permeability. Although the NMR petrophysical properties of coals have been studied for decades, the impact of heat on these properties (pore size distribution, pore structures, porosity and permeability) has not yet been systematically investigated. However, these are key properties for coalbed methane (CBM) generation and production. Therefore, they may have significant implications for the effects of heat from geothermal dynamics and magma intrusion on CBM concentration and transport in coals with different ranks. Thus, NMR experiments for samples treated at different temperatures (from 25℃ to 375℃) were designed to study the variation of petrophysical properties of three Chinese coal cores with different ranks. Results show that NMR transverse relaxation (T_2) distributions of the water saturated cores strongly relate to the coal pore structure and coal rank. Furthermore, based on T_2 cutoff time method, five models for calculating the permeability of coals to water were evaluated. The results show that the Schlumberger Doll Research (SDR) model and its improved model provided the best estimation among the five models because these two models are generally able to represent the matrix permeability of the coal, based on the comparison between the results from measured gas permeability and NMR permeability models. Further calculations indicate that the porosity of all three different rank coals have an increasing trend with exposure to temperature, but with different increments for these coals. The low-volatile bituminous coal has the largest increment (9.44%), which is an improvement of more than 200% from its original porosity (4.02%). While the permeability has no similar trend for these three rank coals after heat treatment due to the strong heterogeneity of pore structure in coals. The results may suggest complex microfractures widths change for forming/closing at different heating stages.
机译：在过去的几十年中，核磁共振（NMR）技术已成为一种用于评估储层性质的岩石物理工具。全面的储层评估需要确定不可还原流体，活动流体和渗透率。尽管已经研究了煤的NMR岩石物理性质数十年，但尚未系统地研究热对这些性质（孔尺寸分布，孔结构，孔隙率和渗透率）的影响。但是，这些是煤层气（CBM）产生和生产的关键特性。因此，它们可能对地热动力和岩浆侵入热对不同等级煤中煤层气浓度和运移的影响具有重要意义。因此，设计了在不同温度（25℃至375℃）下处理的样品的NMR实验，以研究三种不同等级的中国煤芯的岩石物理性质的变化。结果表明，水饱和岩心的NMR横向弛豫（T_2）分布与煤孔结构和煤阶密切相关。此外，基于T_2截止时间方法，评估了五个计算煤对水的渗透率的模型。结果表明，Schlumberger Doll Research（SDR）模型及其改进模型在这五个模型中提供了最佳估计，因为这两个模型通常能够根据测得的气体结果之间的比较来表示煤的基质渗透率渗透率和NMR渗透率模型。进一步的计算表明，三种不同等级煤的孔隙度都随着温度的升高而增加，但这些煤炭的增量却不同。低挥发性烟煤的增量最大（9.44％），比其原始孔隙度（4.02％）提高了200％以上。尽管由于煤中孔隙结构的强烈异质性，热处理后这三种煤的渗透率没有相似的趋势。结果可能表明，在不同的加热阶段，复杂的微裂缝宽度会发生变化，从而形成/闭合。

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  • 来源
    《Fuel》 |2013年第6期|292-302|共11页
  • 作者

    Yidong Cai; Dameng Liu; Zhejun Pan; Yanbin Yao; Junqian Li; Yongkai Qiu;

  • 作者单位

    Coal Reservoir Laboratory, National Engineering Research Center of CBM Development & Utilization, China University of Geosciences, Beijing 100083, PR China, CSIRO Earth Science and Resource Engineering, Private Bag 10, Clayton South, Victoria 3169, Australia;

    Coal Reservoir Laboratory, National Engineering Research Center of CBM Development & Utilization, China University of Geosciences, Beijing 100083, PR China;

    CSIRO Earth Science and Resource Engineering, Private Bag 10, Clayton South, Victoria 3169, Australia;

    Coal Reservoir Laboratory, National Engineering Research Center of CBM Development & Utilization, China University of Geosciences, Beijing 100083, PR China;

    Coal Reservoir Laboratory, National Engineering Research Center of CBM Development & Utilization, China University of Geosciences, Beijing 100083, PR China;

    Coal Reservoir Laboratory, National Engineering Research Center of CBM Development & Utilization, China University of Geosciences, Beijing 100083, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    petrophysical properties; permeability; temperature effect; coalbed methane; nuclear magnetic resonance (NMR);

    机译：岩石物性渗透性温度效应煤层气核磁共振（NMR）;

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