Methane Absolute Adsorption in Kerogen Nanoporous Media with Realistic Continuous Pore Size Distributions,Energy & Fuels

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Methane Absolute Adsorption in Kerogen Nanoporous Media with Realistic Continuous Pore Size Distributions
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-09-18 , DOI: 10.1021/acs.energyfuels.0c01886
Wanying Pang ₁ , Zhehui Jin ₁

Affiliation

Accurate estimation of CH₄ absolute adsorption amount is essential for shale gas-in-place (GIP) evaluation as well as well productivity. Recent studies have shown that pore size distribution (PSD) plays an important role in determination of the absolute adsorption. However, previous studies only contain some discretized pore sizes, while a continuous PSD has not been fully taken into account. In this work, CH₄ adsorption behaviors in various nanopores are first investigated via the grand canonical Monte Carlo (GCMC) simulations. The CH₄ adsorption in nanopores is divided into six distinct adsorption types based on density distributions. Then, the Ono–Kondo (OK) model with PSD lumping is used to characterize CH₄ absolute adsorption in kerogen nanoporous media with pore sizes ranging from 0.7 to 50 nm. The validity of our proposed OK model with PSD lumping is tested by 5 cases with varying micropore volume proportions from 5 to 35%, with each case containing 250 sets of randomly generated PSD samples. We find that by fitting the excess adsorption isotherm, the OK model with PSD lumping has an excellent agreement in terms of the absolute adsorption amounts with those obtained from the GCMC simulation, while deviations increase as micropore volume proportion increases. Overall, the OK model with PSD lumping outperforms the popular single-layered Langmuir and SDR models as well as multilayer models such as supercritical BET (SBET) and single-parameter OK model without PSD considerations for absolute adsorption predictions in kerogen nanoporous media with a continuous PSD.

中文翻译：

具有实际连续孔径分布的干酪根纳米多孔介质中甲烷的绝对吸附

CH ₄绝对吸附量的准确估算对于评估页岩气（GIP）以及提高生产率至关重要。最近的研究表明，孔径分布（PSD）在确定绝对吸附中起着重要作用。但是，以前的研究仅包含一些离散的孔径，而连续PSD并未得到充分考虑。在这项工作中，首先通过经典的蒙特卡洛（GCMC）模拟研究了各种纳米孔中CH _4的吸附行为。基于密度分布，纳米孔中的CH ₄吸附分为六种不同的吸附类型。然后，使用具有PSD集总的Ono-Kondo（OK）模型来表征CH ₄在孔径为0.7至50 nm的干酪根纳米多孔介质中的绝对吸附。我们提出的带有PSD集总的OK模型的有效性是通过5个微孔体积比例在5％至35％之间的案例进行测试的，每个案例包含250组随机生成的PSD样本。我们发现，通过拟合过量的吸附等温线，具有PSD集总的OK模型在绝对吸附量方面与从GCMC模拟获得的绝对吸附量具有极好的一致性，而随着微孔体积比例的增加，偏差也会增加。总体，

更新日期：2020-10-16

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