屈洋,余曹,杨洋,于海生,王青振,康鑫
QU Yang,YU Cao,YANG Yang,YU Haisheng,WANG Qingzhen,KANG Xin

• 1:多资源协同陆相页岩油绿色开采全国重点实验室
• 2:中国石油大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

无机矿物作为页岩油层主要成分，是油气吸附的重要载体，因此研究油气在无机纳米孔隙中的赋存机理十分重要。采用分子模拟技术，通过构建页岩无机矿物和油气分子模型，剖析页岩油气的多相赋存机制，模拟不同温度、压力条件下甲烷、戊烷、癸烷、十五烷等油气分子与二氧化硅矿物表面的相互作用。结果表明：低温下分子扩散慢，有利于吸附平衡，高温下以解吸为主，温度越高，流体与矿物表面之间的范德华力越小，越有利于流体解吸脱附，从而提高油气藏动用程度；高压下分子间距减小，页岩油分子与页岩固体表面的范德华作用增强，导致页岩油吸附量显著增加；轻烃分子可动率大于重烃分子，当孔隙直径增加到12 nm时，小分子烷烃（C_1、C_5）动用率可达到约80%，而长链烷烃（C_(10)、C_(15)）只能达到约60%。研究成果可为页岩油气藏储量评估、开采方案优化提供理论支撑。
Inorganic minerals, as the main component of shale oil reservoirs, are important carriers for hydrocarbon adsorption. Therefore, it is crucial to study the occurrence mechanism of oil and gas in inorganic nanopores. Molecular simulation technology is used to construct models of shale inorganic minerals and hydrocarbon molecules, analyzing the multiphase occurrence mechanism of shale oil and gas. Interaction between hydrocarbon molecules such as methane, pentane, decane and pentadecane and the surface of silica minerals is simulated in conditions of different temperatures and pressures. The results show that molecular diffusion is slow at low temperatures, which is conducive to adsorption equilibrium, while desorption dominates at high temperatures. The higher the temperature, the smaller the van der Waals force between the fluid and mineral surface, which is conducive to fluid desorption and desorption, and improves the producing degree of oil and gas reservoirs. Under high pressure, the molecular spacing decreases, and the van der Waals interaction between shale oil molecules and shale solid surfaces is enhanced, resulting in a significant increase in shale oil adsorption capacity. The productivity of light hydrocarbon molecules is higher than that of heavy hydrocarbon molecules. When pore size increases to 12 nm, the productivity of small molecule alkanes(C_1, C_5) is up to about 80%, while long-chain alkanes(C_(10), C_(15)) only reach 60%. The research provides theoretical support for reserves evaluation and production plans optimization of shale oil and gas reservoirs.

关键词(KeyWords)： 分子模拟;烷烃;吸附;二氧化硅;页岩油;密度分布
molecular simulation;alkanes;adsorption;SiO_2;shale oil;density distribution

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金联合基金项目“中高熟陆相页岩油富集理论与绿色有效开发基础研究”（U24B6004）;; 国家科技重大专项“松辽盆地白垩系陆相页岩油勘探开发技术与集成示范”（2024ZD1404904）;; 黑龙江省重点研发计划（创新基地）项目“多资源协同陆相页岩油绿色开采全国重点实验室”（JD2023GJ02）;; 中国石油大庆油田有限责任公司科技项目“凉高山组页岩油有效开发技术研究”（25DQYTSG004-16-05）

作者(Author): 屈洋,余曹,杨洋,于海生,王青振,康鑫
QU Yang,YU Cao,YANG Yang,YU Haisheng,WANG Qingzhen,KANG Xin

DOI: 10.19597/J.ISSN.1000-3754.202509029

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