浅层超低渗致密砂岩储层应力敏感性定量模型  

The Quantitative Model of Stress Sensitivity for Shallow and Ultra-low Permeability and Tight Sandstone Reservoirs

作　　者：刘广英 吴楠 

机构地区：[1]中石化华北油气分公司工程技术研究院,河南郑州450006 [2]中石化新星河南新能源开发有限公司,河南郑州450004

出　　处：《长江大学学报（自然科学版）》2017年第23期8-12,18,共6页Journal of Yangtze University(Natural Science Edition)

基　　金：国家科技重大专项(2011ZX05045-003-02);中国石油化工集团公司科技攻关项目(P14076-1)

摘　　要：为研究浅层超低渗致密砂岩储层应力敏感性,以鄂尔多斯盆地渭北油田延长组储层为研究对象,采用变围压应力敏感性试验,分析长3、长6和长7油层组的应力敏感性程度,并建立相应的应力敏感性定量模型。研究表明,长3油层组应力敏感性为弱-强,波动范围较大;长6油层组应力敏感程度强;长7油层组应力敏感程度中等偏强-强。同一储层初始渗透率越低,应力敏感性越强。储层渗透率对净围压变化普遍比较敏感,渗透率不可恢复率随埋深的增加而减小。当初始渗透率大于0.3mD时,渗透率最大损失率随渗透率的增大而增大;当初始渗透率小于0.3mD时,渗透率最大损失率随渗透率的增大而减小。研究区长3油层组应力敏感性模型以幂函数和指数函数为主。In order to investigate the stress sensitivity of shallow and tight sandstone reservoirs characterized by ultra-low permeability,by taking Yanchang Reservoir in Weibei Oilfield of Ordos Basin as research object,a variable confining pressure of stress sensitivity experiment was applied to analyze the stress sensitivity degree of Chang 3,Chang 6 and Chang 7 Reservoirs,a corresponding quantitative model of stress sensitivity was established.The study showed that the sensitivity of Chang 3 Reservoir was weak-strong with large fluctuation range,while the sensitivity of Chang 6 and Chang 7 Reservoirs was strong and middle strong-strong respectively.The lower initial permeability in the same formation corresponds to strong stress sensitivity.Reservoir permeability was generally more sensitive to the changes in net confining pressure,and the permeability non-recoverable rate decreased with the increase of depth.When the initial permeability was larger than 0.3 mD,the permeability maximum loss rate increases with the increase of permeability.When the initial permeability is less than 0.3 mD,the maximum permeability loss rate decreased with the increase of permeability.When the initial permeability was less than 0.3 mD,the maximum permeability loss rate increased with the decrease of permeability.The stress sensitivity model of the Chang 3 Reservoirs is mainly based on the power function and the exponential function.

关 键 词：浅层超低渗致密砂岩储层 应力敏感性试验 应力敏感定量模型 

分 类 号：TE122.2[石油与天然气工程—油气勘探]