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首页> 外文期刊>Environmental Science & Technology >Experimental Observation of Permeability Changes In Dolomite at CO_2 Sequestration Conditions
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Experimental Observation of Permeability Changes In Dolomite at CO_2 Sequestration Conditions

机译：CO_2固存条件下白云岩渗透率变化的实验观察

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摘要

Injection of cool CO_2 into geothermally warm carbonate reservoirs for storage or geothermal energy production may lower near-well temperature and lead to mass transfer along flow paths leading away from the well. To investigate this process, a dolomite core was subjected to a 650 h, high pressure, CO_2 saturated, flow-through experiment. Permeability increased from 10~(-15.9) to 10~(-15.2) m~2 over the initial 216 h at 21 ℃, decreased to 10~(16.2) m~2 over 289 h at 50 ℃, largely due to thermally driven CO_2 exsolution, and reached a final value of 10~(16.4) m~2 after 145 h at 100 ℃ due to continued exsolution and the onset of dolomite precipitation. Theoretical calculations show that CO, exsolution results in a maximum pore space CO_2 saturation of 0.5, and steady state relative permeabilities of CO_2 and water on the order of 0.0065 and 0.1, respectively. Post-experiment imagery reveals matrix dissolution at low temperatures, and subsequent filling-in of flow passages at elevated temperature. Geochemical calculations indicate that reservoir fluids subjected to a thermal gradient may exsolve and precipitate up to 200 cm~3 CO_2 and 1.5 cm~3 dolomite per kg of water, respectively, resulting in substantial porosity and permeability redistribution.
机译：将凉爽的CO_2注入地热温暖的碳酸盐岩储层中以进行存储或生产地热能，可能会降低近井温度，并导致沿远离井的流动路径传质。为了研究此过程，对白云岩岩心进行了650小时，高压，CO_2饱和的流通实验。在21℃最初的216 h中，渗透率从10〜（-15.9）m〜2增加到10〜（-15.2）m〜2，在50℃的289 h中渗透率降低到10〜（16.2）m〜2。 CO_2的溶解，由于持续的溶解和白云石的析出，在100℃145 h后达到了10〜（16.4）m〜2的最终值。理论计算表明，CO的释放导致最大的孔隙空间CO_2饱和度为0.5，CO_2和水的稳态相对渗透率分别为0.0065和0.1。实验后的图像显示了低温下基质的溶解，以及随后在高温下流道的填充。地球化学计算表明，受热梯度作用的储层流体可能分别溶解和沉淀高达200 cm〜3 CO_2和1.5 cm〜3白云岩/ kg水，从而导致大量的孔隙度和渗透率重新分布。

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  • 来源
    《Environmental Science & Technology》 |2014年第4期|2445-2452|共8页
  • 作者

    Benjamin M. Tutolo; Andrew J. Luhmann; Xiang-Zhao Kong; Martin O. Saar; William E. Seyfried Jr.;

  • 作者单位

    Department of Earth Sciences, University of Minnesota, Minneapolis, Minnesota, 55455, United States;

    Department of Earth Sciences, University of Minnesota, Minneapolis, Minnesota, 55455, United States;

    Department of Earth Sciences, University of Minnesota, Minneapolis, Minnesota, 55455, United States;

    Department of Earth Sciences, University of Minnesota, Minneapolis, Minnesota, 55455, United States;

    Department of Earth Sciences, University of Minnesota, Minneapolis, Minnesota, 55455, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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