页岩气藏多重介质流体跨尺度传质表征方法研究  

Characterization methods for mass transfer of multiple media in shale gas reservoirs

作　　者：苏玉亮[1] 盛广龙 王文东[1] 詹世远 张琪[1] 鲁明晶 李亚军[1] SU YuLiang;SHENG GuangLong;WANG WenDong;ZHAN ShiYuan;ZHANG Qi;LU MingJing;LI YaJun(School of Petroleum Engineering, China University of Petroleum （East China）, Qingdao 266580, China;Bureau of Economic Geology, The University of Texas at Austin, Austin TX 78713, USA)

机构地区：[1]中国石油大学(华东)石油工程学院,青岛266580 [2]Bureau of Economic Geology,The University of Texasat Austin

出　　处：《中国科学：技术科学》2018年第5期510-523,共14页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:51674279);国家科技重大专项(编号:2017ZX05049-006;2017ZX05072;2017ZX05069);国家重点基础研究发展计划(编号:2014CB239103);中央高校基本科研业务费专项资金(编号:17CX06010);中国石油大学研究生创新工程(编号:YCXJ2016016);中国博士后科学基金(编号:2016M602227)资助项目

摘　　要：页岩气藏多尺度孔隙介质发育、非均质性强,不同尺度介质流体运移机制复杂,明确多重介质流体跨尺度传质表征方法的适用范围对开展页岩气藏数值模拟研究具有重要意义.本文基于体积压裂改造页岩气藏储层多尺度介质分布特征及多尺度介质气体运移特性,以储层不同区域微小单元体为研究对象,分别建立离散介质、拟稳态窜流双重介质、瞬态窜流双重介质表征单元体模型,对比分析不同储层条件和裂缝参数时离散介质模型与不同窜流模式双重介质表征单元体模型内流体产量变化规律,得到页岩气藏多重介质流体跨尺度传质表征方法适用范围.研究结果表明:生产早期不同窜流模式对窜流量影响较大,多重介质渗透率相差越大,生产早期不同窜流模式得到的窜流量相差越大,窜流量差异持续时间越长;采用瞬态窜流或拟稳态窜流双重介质模型可以较为准确地描述干酪根有机质-无机基岩之间流体跨尺度传质规律;无机基岩-次生缝网流体跨尺度运移规律需要采用离散介质模型进行描述.离散缝网耦合干酪根-无机基岩双重介质模型可以比较精确描述体积改造页岩气藏流体运移规律,该模型对开展页岩气藏数值模拟器研究具有重要的理论意义.Shale gas reservoirs are abound in multi-scale pore media and have strong heterogeneity. Gas migration mechanism in different scale pores is complex. Understanding the applicability of mass transfer characterization method for multi-media fluid is of great significance to develop numerical simulation of shale gas reservoirs. On the basis of multi-scale media distribution characteristics and the gas migration characteristics in multi-scale media of shale gas reservoirs, this paper establish the discrete media REV model,transient-cross-flow dual-media REV model, and pseudo-state-cross-flow dual-media REV model for microcells in different regions of reservoirs. The flow behavior of the microcells calculated by the above three models is compared with reservoir conditions and fracture parameters. The suitable rang of different mass transfer characterization methods for multiple media is proposed. The results showed that the cross-flow mode have a great effect on mass transfer on the early period. The greater the difference of dual media, the bigger the difference of mass transfer calculated by different cross-flow mode, the longer the duration of the difference of mass transfer. The transient-cross-flow dual-media model, and pseudo-state-cross-flow dual-media model can both accurately describe the mass transfer between porous kerogen and inorganic matrix. Mass transfer between inorganic matrix and secondary fractures should be described by discrete media model. The discrete fracture network coupled porous kerogen-inorganic matrix dual medium model can be more accurately for description of gas migration in shale gas reservoirs with stimulated reservoir volume. The model has important theoretical significance for developing numerical simulator for shale gas reservoirs.

关 键 词：页岩气藏 离散介质 多重介质 跨尺度传质 

分 类 号：TE31[石油与天然气工程—油气田开发工程]