考虑混合润湿孔隙的页岩油藏表观渗透率模型  

An apparent oil permeability model for shale oil reservoir with mixed-wet nanopores

作　　者：李洋 王胜 王硕亮[2] LI Yang;WANG Sheng;WANG Shuoliang(Reservoir Dynamic Monitoring Center of Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China;School of Energy Resources,China University of Geoscience(Beijing),Beijing City,100083,China)

机构地区：[1]中国石化胜利油田分公司油藏动态监测中心,山东东营257001 [2]中国地质大学(北京)能源学院,北京100083

出　　处：《油气地质与采收率》2024年第2期108-118,共11页Petroleum Geology and Recovery Efficiency

摘　　要：页岩油藏是典型的非常规油气资源,在国际能源供应市场上占有重要地位。由于页岩油藏复杂的孔隙结构和原油组成,使得原油在富有机质页岩中的流动具有一定的复杂性,对其流动行为仍有待进一步深入研究。基于随机模拟方法,考虑流体在混合润湿纳米孔隙中的流动特征,建立页岩油藏表观渗透率模型。结果表明:页岩油藏表观渗透率与烷烃分子结构直接相关,其影响随着孔隙半径的增大而减小;当边界滑移长度较大时,有机质的存在可以改善原油流动能力,其表观渗透率约为绝对渗透率的10倍。同时,有机质吸附导致的孔隙半径缩小和润湿反转效应对烷烃分子流动能力有显著影响,不可忽略。所建立的考虑混合润湿孔隙的页岩油藏表观渗透率模型有助于深入认识页岩油藏流体渗流机理,可为页岩油藏产能评价、动态分析及生产制度优化提供理论支撑。Shale oil reservoir is a typical unconventional oil and gas resource that plays an essential role in the international en‐ergy supply market.Due to the complex pore structure and crude oil composition of shale oil reservoirs,the flow of crude oil in organic-rich shales has a certain complexity,and its flow behavior still needs to be further studied.Based on the stochastic simu‐lation method,the flow characteristics of fluid in mixed-wet nanopores were considered,and an apparent oil permeability(AOP)model of shale oil reservoirs was established in this paper.The results show that the AOP of shale oil reservoirs is directly related to the molecular structure of alkanes,and its influence decreases with the increase of pore radius.The organic matter can improve the flow capacity of crude oil when the boundary slip length is large,and its AOP is about ten times the absolute permeability.At the same time,the pore radius reduction and wetting reversal effect triggered by adsorbed organic matter significantly impact the flow capacity of alkane molecules,and these effects cannot be ignored.The AOP model of shale oil reservoirs consid‐ering mixed-wet nanopores established in this paper helps understand the fluid flow mechanism of shale oil reservoirs and can provide theoretical support for productivity evaluation,dynamic analysis,and production system optimization of shale oil reser‐voirs.

关 键 词：页岩 混合润湿 边界滑移 有机质吸附 随机抽样 表观渗透率 

分 类 号：TE122[石油与天然气工程—油气勘探]