裂缝性致密油藏水驱动态渗吸特征实验研究——以鄂尔多斯盆地富县地区长8储层为例

以鄂尔多斯盆地富县地区长8致密砂岩样品为研究对象,在岩心润湿性与孔隙微观结构剖析的基础上,研究了渗透率与水驱速度对裂缝性致密岩心样品动态渗吸采出程度的影响规律。实验结果表明:长8岩心属弱亲水砂岩,不同渗透率样品的孔隙尺寸分布范围(亚微米-微米级)属同一量级,峰值尺寸差异不大,但岩心渗透率越高,三维孔喉连通性越强;水驱速度相同时,受岩石孔隙连通性的影响,裂缝性岩心动态渗吸采出程度与基质渗透率正相关;水驱速度不同时,基质渗透率越高,裂缝系统内黏滞阻力越高,对应的最优水驱速度越高;对于裂缝性致密砂岩油藏而言,应选择合理的水驱速度,裂缝系统内水驱速度过快时,将抑制基质系统的逆向渗吸作用,从而大大降低动态渗吸采出程度,使得注入水无效、低效循环。     

Effects of charge compensation on red emission in CaYAl3OT7：Eu3＋ phosphor

Monovalent ions Li＋, Na＋, and K＋, as charge compensators, are introduced into CaYA1307： M （M = Eu3＋, Ce~＋） in this letter. Their crystal phases and photoluminescence properties of different alkali metal ions doped in CaYA1307 are investigated. In addition, the influence of charge compensation ion Li＋ which has a more obvious role in improving luminescence intensity on CaYA1307： Eu3＋ phosphor is intentionally discussed in detail and a possible mechanism of charge compensation is given. The enhancement of red emission centered at 618 nm belonging to Eu3＋ is achieved by adding alkali metal ion Li＋ under 393-nm excitation.     

Energy transfer mechanism in Er3＋ doped fluoride glass sensitized by Tm3＋ or no3＋ for 2.7-μm emission

Enhanced 2.7 μm emission is obtained in Er3＋/Tma＋ and Era＋/Ho3＋ codoped ZBYA glasses. Absorp- tion and emission spectra are tested to characterize the 2.7 μm emission properties of Era＋/Tm3＋ and Era＋/Ho3＋ doped ZBYA glasses and a reasonable energy transfer mechanism of 2.7 μm emission between Er3＋ and Tm3＋Ho3＋） ion is proposed. Codoping of Tm3＋ or Ho3＋ significantly reduces the lifetime of the Era＋： 4I13/2 level due to the energy transfer of Er3＋：4I13/2 →Tm3＋：3F4 or Er3＋：4I13/2 →Ho3＋： 5I7. Thus, the 2.7μm emission is strengthened and the 1,5μm emission is decreased accordingly especially in the Era＋/Tma＋ sample. The upconversion effects between the Er3＋/Tm3＋ and Er3＋/Ho3＋ doped ZBYA glasses are different attribute to the different energy transfer efficiencies. Both of the two codoped samples possess nearly equal large emission cross section （16.6 × 10 -21 cm-2） around 2.7 μm. The results indicate that this Er3＋/Tm3＋ or Er3＋/Ho3＋ doped ZBYA glass has potential applications in 2.7 μm laser.     

厦门现代信息服务业的发展现状与对策探讨

信息服务业是信息产业的一个重要组成部分,也是一个城市发展高端服务业需要重点解决的问题之一.该文以厦门信息服务业的现状分析为基础,探讨了厦门信息服务业在发展过程中存在的问题和不足,并提出了促进其发展的战略重点.     

结构主义视角下对《思家饭店的晚餐》的解析

通过对安妮·泰勒的小说《思家饭店的晚餐》中逃离与坚守,渴望与失望,冲突与和解这三组二元对立项的分析,揭示了小说所蕴含的深刻主题：家庭成员之间,成员与家庭之间的关系在矛盾和冲突中走向圆满和谐。     

Empowering perovskite PbTiO_3 nanoparticles with enhanced up-conversion luminescence and thermal sensitivity by introducing Er~(3+) dopant

Up-convertion(UC)perovskite Er³⁺-doped Pb TiO3(Er-PTO)nanoparticles with green and red emissions were synthesized via the hydrothermal method.The UC properties were manipulated by adjusting the concentration of Er³⁺ ions dopant.The green emission intensity was decreased as the doping concentration increased from 1% to 4%(mole fraction),whereas the red emission intensity was increased.The influences of Er³⁺ ions on the temperature-sensing performance were further investigated.The results demonstrated that Er-PTO nanoparticles with doping 1% Er³⁺ ions possessed a sensitivity of3.1×10^-3 K^-1 at 475 K,presenting a high potential in optical heating devices.