136 Micro-Nano Scale Pore-Fracture Architecture and Fluid Dynamics in Shale and Coal Reservoirs
The exploration and development of shale and coal reservoirs are pivotal to modern unconventional fossil energy production. The intricate micro-nano scale pore-fracture architecture within these reservoirs significantly influences storage capacity, fluid occurrence, and migration dynamics.
Monday, 20 October 2025
1:30 PM - 5:30 PM
HBGCC, 302C
Methane adsorption mechanisms in deep/ultra-deep shale and its insights for adsorption model
Paper number: 136-11
Program: Technical Sessions
Time: 4:20 PM – 4:35 PM
Authors
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Guohui ChenNEPU sanya offshore oil&gas research institute, sanya
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Zhongxian CaiChina University of Geosciences (Wuhan), wuhan
Abstract
由于对深层和超深层页岩气吸附机制的了解有限，因此使用数学模型准确预测吸附能力具有挑战性。本研究使用GCMC和MD方法研究不同深度和孔径的有机纳米孔隙中甲烷的出现情况。随着埋深的增加，吸附层之间的相互作用加强，这解释了深层和超深层页岩地层中存在明显的第三吸附层。孔径显著影响甲烷吸附行为。在微孔中，潜在的重叠效应降低了甲烷的迁移率。这种重叠效应随着孔径的增加而减弱，游离甲烷开始在 2 nm 左右出现。接下来，我们讨论了温度和压力对不同吸附层的流动和扩散速率的耦合影响。随着埋深的增加，影响甲烷扩散的主要因素从压力转向温度。结果还表明，第三吸附层甲烷的平均密度和流速与本体中相似，因此将其排除在吸附计算之外。最后，基于吸附机理对经典的Langmuir模型进行了修正，这是本研究的创新之一。吸附相密度/厚度的统计结果表明，将它们视为拟合常数并不完全合适。将吸附的相密度替换为体积，并将其转换为与压力相关的对数函数，模型预测值与测量值之间具有良好的一致性，平均相对误差低于10%。
Geological Society of America Abstracts with Programs. Vol. 57, No. 6
doi: 10.1130/abs/2025AM-412747
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