排序方式： 共有8条查询结果，搜索用时 31 毫秒
1
1.
Caprock has the most important role in the long term safety of formation gas storage. The caprocks trap fluid accumulated beneath, contribute to lateral migration of this fluid and impede its upward migration. The rapid upward passage of invasive plumes due to buoyancy pressure is prevented by capillary pressure within these seal rocks. In the present study, two main seal rocks, from the Zagros basin in the southwest of Iran, a shale core sample of Asmari formation and an anhydrite core sample of Gachsaran formation, were provided. Absolute permeabilities of shale and anhydrite cores, considering the Klinkenberg effect, were measured as 6.09 × 10−18 and 0.89 × 10−18 m2, respectively. Capillary sealing efficiency of the cores was investigated using gas breakthrough experiments. To do so, two distinct techniques including step by step and residual capillary pressure approaches were performed, using carbon dioxide, nitrogen and methane gases at temperatures of 70 and 90 °C, under confining pressures in the range 24.13–37.92 MPa. In the first technique, it was found that capillary breakthrough pressure of the cores varies in the range from 2.76 to 34.34 MPa. Moreover, the measurements indicated that after capillary breakthrough, gas effective permeabilities lie in range 1.85 × 10−21 – 1.66 × 10−19 m2. In the second technique, the minimum capillary displacement pressure of shale varied from 0.66 to 1.45 MPa with the maximum effective permeability around 7.76 × 10−21 – 6.69 × 10−20 m2. The results indicate that anhydrite caprock of the Gachsaran formation provides proper capillary sealing efficacy, suitable for long term storage of the injected CO2 plumes, due to its higher capillary breakthrough pressure and lower gas effective permeability. 相似文献
2.
Mohamed Abdallah Gad DARWISH 《《地质学报》英文版》2014,88(1):196-212
The SEM-EDX technique was applied to investigate Au, and Cu＋Sn alloyed grains in the mineralization of the Um Shashoba mine for achieving further understanding of occurrences, internal structures and microchemistry of Au and Cu alloys and associated minerals, and mineralization type. This study is aiming at the genetic history of ore-bearing fluid events, geochemical evaluation and exploration significance. The results showed that the mineralization could be considered as a single major episode generated by metamorphic mesothermal solution rich in sulfides and unsaturated respect to Au. It was differentiated into many stages; started with formation of auriferous pyrite that was pseudomorphed by secondary hematite, limonite and goethite. Three phases of Au alloy were precipitated, and Cu＋Sn and Ag-rich alloys were produced respectively and followed by deposition of two generations of barren pyrite. Calcite and ankerite were crystalized, surrounded and partially replaced some of early formed minerals. Finally, barren muscovite recrystallized around and inside both later formed carbonate minerals that were free of any sign of Au in their structures. The processes of deformation, recrystallization, annealing, dissolution, remobilization and re-precipitation played the most important roles in the genetic history of the mineralization. 相似文献
3.
为了解乌鲁木齐冬季污染天气形成过程中大气颗粒物化学组分的变化,探讨霾天气快速形成的主要原因,应用扫描电镜/X射线能谱仪(SEM/EDX)对2013年2月乌鲁木齐东南郊一次典型霾天和正常天气所采集的大气颗粒物(PM10)样品进行了微观形貌和化学组成的对比分析。结果表明:伴随着霾形成过程细粒子浓度呈现急剧上升趋势,PM1.0/PM10比值高达0.77。SEM/EDX观测显示,霾天形成前后,PM10的形态结构和元素组成存在较明显的差异,霾天规则的石膏颗粒占规则颗粒的71.1%,明显高于正常天气,表明大气颗粒物的硫化现象比较普遍,大量硅铝酸盐飞灰说明采样点周边有较明显的燃煤源输送;二次无机颗粒组成主要为硫酸盐颗粒,由正常天气的16.1%增加到24.6%,高浓度硫酸盐与乌鲁木齐东南郊此次霾形成有密切的联系。 相似文献
4.
兰州市取暖期可吸入颗粒物中单颗粒矿物组成特征 总被引：2，自引：1，他引：1
为研究兰州市2005年冬季大气可吸入颗粒物(PM10)中单颗粒的矿物组成,用能谱扫描电镜识别和统计了兰州市区(东方红广场)和郊区(榆中县)两个采样点的单矿物颗粒。结果在市区样品中识别出方解石、伊/蒙混层、石英、斜长石、伊利石、石膏、绿泥石、高岭石、浊沸石和钾长石等21种矿物,前7种占统计总量的75%以上;郊区样品中识别出20种矿物,以方解石、石英、伊利石、绿泥石、斜长石和伊/蒙混层为主(占70%以上),与市区相比缺少钾石膏、金红石和水铝酸钙而增加了硫酸镁和磷灰石。总体来看,大气PM10中的矿物颗粒可分为粘土类、长石类、碳酸盐类、硫酸盐类、氧化物类和其他六类,以粘土类和碳酸盐类矿物为主(约占60%);冬季市区颗粒物表面的“硫化”现象较郊区严重;这些矿物颗粒主要来自地表土,人为排放和大气中二次化学反应生成的矿物的贡献较小。 相似文献
5.
I. Kapišinský V. Figusch A. Hajduk J. Ivan K. Iždinský 《Earth, Moon, and Planets》1995,68(1-3):347-360
A set of four stratospheric particles was reanalysed. These particles registered in the NASA Cosmic Dust Catalogs (CDCs) were classified in the Houston Johnson Space Center (JSC) as the particles of cosmic origin (C). Present energy-dispersive X-ray (EDX) spectra confirmed previous classification and revealed additional features in the chemical composition of the cosmic dust particles.The particles are extremely fine-grained aggregates with bulk chondritic composition. Somewhat higher content of oxygen may indicate a presence of hydroxide containing minerals in their phase composition. 相似文献
6.
唐山大气降尘的矿物组成与微观形貌特征分析 总被引：1，自引：0，他引：1
应用X射线衍射线技术(XRD)和扫描电镜技术(SEM/EDX)对唐山大气降尘中颗粒的矿物组成及微观形貌进行了研究。结果表明,唐山大气降尘的主要矿物组分是方解石、石英和粘土,次为赤铁矿、石膏、白云石及长石类矿物,其它的矿物还有菱铁矿、菱镁矿、石盐、沸石、角闪石、钙芒硝和无水芒硝等;其形貌特征主要有球状、层状、片状、柱状和块状等规则形态及矿物单体和矿物集合体等不规则形态;对XRD的检测结果进行分析后,表明大气降尘颗粒物的主要来源为地面扬尘、建筑扬尘、工业尘及在大气环境中新生成的矿物。 相似文献
7.
使用SEM／EDX对北京不同月份采集的可吸人颗粒物(PM10)中的1454个矿物颗粒进行了识别和统计。结果显示，矿物颗粒的种类十分复杂，可以鉴定出的矿物有38种，其中以粘土矿物的含量最高，年平均值为30．1％；粘土矿物中以伊利石／蒙皂石混层为主，占粘土矿物总数的35％；石英、方解石、复合颗粒、碳颗粒的年均值分别为13．5％、10．9％、11．95％、10．31％；年平均含量小于10％的矿物有石膏、长石、白云石等；首次检测出萤石、磷灰石、岩盐、重晶石、氯化锌等矿物。研究还发现，硫化现象可以发生在不同矿物颗粒表面，且这种现象主要发生在夏季，反映夏季大气化学反应较为活跃。 相似文献
8.
1