Adsorption of methane and carbon dioxide on gas shale and pure mineral samples
Adsorption of methane and carbon dioxide on gas shale and pure mineral samples
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DOI：
10.1016/j.juogr.2014.06.001
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发表时间：
2014-12-01
期刊：
影响因子：
--
通讯作者：
Zoback, Mark
中科院分区：
文献类型：
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作者：
Heller, Robert;Zoback, Mark
我们测量了Barnett、Eagle Ford、Marcellus和Montney储层的页岩样品在40摄氏度时的甲烷和二氧化碳吸附等温线。二氧化碳等温线用于评估其优先吸附的潜力，以及其作为压裂液和/或在枯竭页岩储层中储存的影响。为了更好地了解组成页岩的单个矿物成分是如何对吸附起作用的，研究人员还对纯碳、伊利石和高岭石样品进行了测量。我们能够根据Langmuir等温线模型成功地拟合两种气体的所有吸附数据。我们的研究结果表明，在纯矿物成分和实际页岩样品中，二氧化碳的吸附能力大约是甲烷的2-3倍。除了真实岩石和纯矿物之间存在明显的微观结构和成分差异外，我们假设水吸附在调节其他分子吸附的表面积方面起着重要作用。所得到的体积膨胀应变也被测量为压力/吸附的函数。我们观察到粘土和纯碳的膨胀量与吸附量近似成线性比例。(C) 2014 Elsevier Ltd.版权所有。
We have measured methane and carbon dioxide adsorption isotherms at 40 degrees C on gas shale samples from the Barnett, Eagle Ford, Marcellus and Montney reservoirs. Carbon dioxide isotherms were included to assess its potential for preferential adsorption, with implications for its use as a fracturing fluid and/ or storage in depleted shale reservoirs. To better understand how the individual mineral constituents that comprise shales contribute to adsorption, measurements were made on samples of pure carbon, illite and kaolinite as well. We were able to successfully fit all adsorption data for both gases in accordance with a Langmuir isotherm model. Our results show carbon dioxide to have approximately 2-3 times the adsorptive capacity of methane in both the pure mineral constituents and actual shale samples. In addition to obvious microstructural and compositional differences between real rocks and pure minerals, we hypothesize that water adsorption plays an important role in regulating surface area availability for other molecules to adsorb. The resultant volumetric swelling strain was also measured as a function of pressure/ adsorption. We observe both clay and pure carbon to swell an amount that is approximately linearly proportional to the amount of adsorption. (C) 2014 Elsevier Ltd. All rights reserved.