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基于分子模拟对不同储层条件下伊利石纳米孔中多组分页岩油吸附行为的洞察

Insights into Adsorption Behaviors of Multi-Component Shale Oil in Illite Nanopores Under Different Reservoir Conditions by Molecular Simulation.

作者信息

Zhang Lingtan, Tan Maojin, Liu Xuefeng, Lu Xiaoqing, Wang Qian, Wang Siyu, Tian Min, Wang Junjie

机构信息

School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China.

College of Science, China University of Petroleum (East China), Qingdao 266580, China.

出版信息

Nanomaterials (Basel). 2025 Feb 3;15(3):235. doi: 10.3390/nano15030235.

DOI:10.3390/nano15030235
PMID:39940211
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11820796/
Abstract

Clay pores are important storage spaces in shale oil reservoirs. Studying the adsorption behavior of shale oil in clay nanopores is of great significance for reserve assessment and exploitation. In this work, illite clay pore models and multi-component shale oil adsorption models considering light hydrocarbon correction are constructed for carrying out molecular dynamics simulation. We studied the adsorption behavior and characteristics of shale oil in illite pores, and analyzed the effects of reservoir environmental factors such as temperature, pressure and pore size on the adsorption behavior. The results show that in illite nanopores, shale oil can form multiple adsorption layers. The heavier the component, the stronger the interaction with the wall. The adsorption ratio of the component is closely related to the solid-liquid interaction and the molar fraction, which preliminarily reveals the reason why the heavy component content in the produced oil is considerable. The increase in temperature promotes the desorption of light and medium components, while the heavy components and dissolved gas are less affected; although the increase in pressure inhibits diffusion, the adsorption amount changes little, and only the light component increases slightly. This study deeply reveals the adsorption mechanism of shale oil in illite pores, providing a theoretical basis for the optimization and development of shale reservoirs.

摘要

黏土孔隙是页岩油储层中重要的存储空间。研究页岩油在黏土纳米孔隙中的吸附行为对储量评估和开发具有重要意义。在这项工作中，构建了伊利石黏土孔隙模型和考虑轻质烃校正的多组分页岩油吸附模型，以进行分子动力学模拟。我们研究了页岩油在伊利石孔隙中的吸附行为和特征，并分析了温度、压力和孔径等储层环境因素对吸附行为的影响。结果表明，在伊利石纳米孔隙中，页岩油可形成多个吸附层。组分越重，与壁面的相互作用越强。组分的吸附率与固液相互作用和摩尔分数密切相关，初步揭示了采出液中重组分含量可观的原因。温度升高促进轻质和中质组分的解吸，而重组分和溶解气受影响较小；压力升高虽抑制扩散，但吸附量变化不大，仅轻质组分略有增加。该研究深入揭示了页岩油在伊利石孔隙中的吸附机理，为页岩油藏的优化开发提供了理论依据。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/9daf1091be80/nanomaterials-15-00235-g019.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/6ab7a80b2316/nanomaterials-15-00235-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/f429266a723c/nanomaterials-15-00235-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/910499e5e098/nanomaterials-15-00235-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/eb5d2f966338/nanomaterials-15-00235-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/fee490d380d2/nanomaterials-15-00235-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/e66350f356d0/nanomaterials-15-00235-g014.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/3f689fcd6b02/nanomaterials-15-00235-g015.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/7d34b2a4b12e/nanomaterials-15-00235-g016.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/926638a78007/nanomaterials-15-00235-g017.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/70dc8393b23e/nanomaterials-15-00235-g018.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d092/11820796/9daf1091be80/nanomaterials-15-00235-g019.jpg

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