油气地质与采收率2026，Vol.33Issue(2)：48-60,13.DOI:10.13673/j.pgre.202403016
岩壁纳米孔隙内页岩油气赋存状态研究
Study on occurrence state of shale oil and gas in nanopores of rock surface
方威 1卢艳 1李劢 1曹立范 1李晨龙 1高润1
作者信息
- 1. 武汉科技大学 冶金装备及其控制教育部重点实验室,湖北 武汉 430081||武汉科技大学 机械传动与制造工程重点实验室,湖北 武汉 430081
- 折叠
摘要
Abstract
Shale oil and gas are widely distributed in oil shale nanopores.Their occurrence state on the rock surface is crucial in disrupting the continuity characteristics.This small-scale effect makes shale oil and gas recovery like blood sampling in capillaries,which directly affects the efficiency of shale oil and gas recovery.Therefore,molecular dynamics was used to establish a hydrocarbon evolution method of multi-stage annealing simulation coupled with thermal cracking.A shale oil and gas model consistent with the actual density was achieved through cracking product weight analysis.At the same time,rough kerogen and hydroxyl quartz surfaces were obtained through analysis of real rock surface characteristics.Based on the coupling of the surface model and shale oil and gas model,the occurrence state of the interface effect between the shale oil and gas and the rock surface in a complex geological environment was studied.Research shows that there are significant differences in the density distribution of shale oil and gas in nanopores.In kerogen nanopores,shale gas molecules are mainly concentrated in the center of the pores,while in quartz nanopores,gas molecules are distributed in the center of the pores and near the surface.As the pore size increases,the density peak of the first adsorption layer gradually becomes saturated,and the number of adsorption layers in kerogen nanopores is significantly higher than that of quartz.The temperature during the thermal cracking process has a significant impact on the composition of shale oil and gas products.Especially under high temperature conditions of 2 200 K,the proportion of target products in shale oil and gas increases significantly.At this temperature,the ratio of C1(methane),C6(hexane),and C12(dodecane)in the thermal cracking products of Longkou oil shale is close to 12∶1∶1,indicating that high temperature has an important role in the generation of shale oil and gas.In addition,surface characteristics have a key impact on the occurrence state and recovery efficiency of shale oil and gas.The rough kerogen surface and hydroxylized quartz surface have varying degrees of impact on the distribution and adsorption behavior of gas,further affecting the release and recovery of oil and gas.关键词
分子动力学模拟/热裂解/成烃演化/纳米孔隙/赋存状态Key words
molecular dynamics simulation/thermal cracking/hydrocarbon evolution/nanopore/occurrence state分类
能源科技引用本文复制引用
方威,卢艳,李劢,曹立范,李晨龙,高润..岩壁纳米孔隙内页岩油气赋存状态研究[J].油气地质与采收率,2026,33(2):48-60,13.
