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大陆页岩矩阵上的甲吸附和脱附:对页岩气凝析物勘探和生产的影响

Min Wang¹, Zengmin Lun^2,3, Xia Zhou^2,3

¹Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, P. R. China.

Langmuir : the ACS journal of surfaces and colloids

|August 12, 2024

概括

大陆页岩气凝聚物勘探需要了解甲 (CH4) 吸附. 无机矿物质,特别是粘土,显著影响CH4吸附和脱附,影响孔隙发育和气体回收.

科学领域:

地质化学地质化学
石油地质学石油地质学
材料科学材料科学材料科学

背景情况:

页岩气凝结物是一个重要的非常规资源,主要由吸附的甲 (CH4) 组成.
大陆页岩气的评价与海洋页岩不同,原因是有机物和矿物成分的不同影响着孔隙结构和CH4吸附.
了解这些差异对于有效的勘探和生产至关重要.

研究的目的:

研究有机物和无机矿物质在孔隙发育和CH4吸附/脱附在大陆页岩气凝结物中的作用.
为了比较大陆页岩与海洋页岩在孔隙结构和气体吸附方面的特征.
阐明粘土矿物质对CH4吸附和脱附催化反应的影响.

主要方法:

利用低温氧等离子体 (LTOP) 技术从大陆状基质中提取有机物质.
分析了原料和有机物质提取的页岩样本的孔隙结构和矿物成分.
研究了与矿物学和孔隙特征相关的CH4吸附和脱附行为.

主要成果:

与海洋页岩相比,大陆页岩矩阵具有更高的粘土含量,更低的石英含量,以及较少的孔隙/断裂.
大陆页岩中孔隙的形成主要由有机物组成.
无机矿物质,特别是粘土,比有机物质对CH4吸附能力的贡献更大.
在没有有机物质的样本中,CH4吸附-脱附歇斯底里症由于粘土膨胀而更加明显.

结论:

无机矿物质,特别是粘土矿物质,在大陆页岩气凝结物中对CH4吸附和脱附起着关键作用.
粘土矿物质的胀显著影响CH4吸附诱导的歇斯底里.
这些发现对于优化大陆页岩气资源的勘探和生产战略至关重要.

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