土壤地球化学测量在博茨瓦纳中部地区的应用     

李飞  施泽明  裴云婧 《物探与化探》2014,(1):58-62

通过在博茨瓦纳中部区Tonota-Foley一带的找矿勘查,探讨土壤地球化学测量方法在博茨瓦纳热带干旱草原景观区的应用效果。利用该方法,在Tonota-Foley一带圈定出化探综合异常17处,通过对典型异常的查证工作,运用槽探工程,查明了异常源为方解石蛇纹岩体,说明土壤地球化学测量方法适用于博茨瓦纳中部地区的景观条件,圈定的异常准确、有效,该方法可在博茨瓦纳同类地区推广使用。  相似文献   

页岩储层物性参数对CO₂不同封存机制及封存量的影响     

尹书郭  杨国栋  冯涛  马鑫  曹伟  黄冕  郭天晴 《高校地质学报》2023,29(1):37-46

CO₂增强页岩气开采技术(CO₂-ESGR)一方面可提高CH4产量,另一方面又可实现CO₂地质封存。为了分析页岩储层物性参数对CO₂封存机制的影响,文章以鄂尔多斯盆地延长组页岩为研究对象,采用CMG-GEM软件建立双孔双渗均质模型,分析了CO₂-ESGR中页岩储层垂直渗透率与水平渗透率之比(Kv/Kh)、含水饱和度和孔隙度对不同CO₂封存机制封存量的影响;并设计了27组正交试验采用极差分析法比较了三种因素的影响程度。研究表明,Kv/Kh在0.1～1范围增大会增加不同CO₂封存机制的封存量,封存总量最大可增加69.96%,其中吸附封存量最大可增加97.96%,受到影响最大;含水饱和度在0～0.9范围增大引起CO₂封存总量先增加后减小,封存总量最大可减少67.12%,其中溶解封存量最大可减少83.35%,范围波动最大;页岩储层孔隙度在0.1～0.99范围增大会导致CO₂封存总量减少,封存总量最大...  相似文献   

Correction to: Laboratory testing and numerical simulation of properties and thermal-induced cracking of Eibenstock granite at elevated temperatures     

Wang  Fei  Konietzky  Heinz  Frühwirt  Thomas  Dai  Yajie 《Acta Geotechnica》2022,17(7):3141-3141

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基于不完全β分布的二项分布参数的Bayesian估计     

赵喜林  赵煜  余东 《南京气象学院学报》2014,6(1):94-96

将β分布推广到不完全β分布,给出了二项分布的可靠度的先验分布为不完全β分布时的一些结论,并讨论了在基于二项分布可靠性增长模型中的应用.  相似文献   

利用多尺度弦角尖锐度累积的自适应角点检测算子     

邢远秀  章登义  赵俭辉 《武汉大学学报(信息科学版)》2015,40(5):617

为提高角点检测算法的定位精度和对噪声的鲁棒性,提出了基于多尺度弦角尖锐度累积的自适应角点检测算子。首先,利用Canny算法快速提取图像边缘轮廓;然后,划分轮廓支撑域并将其作为尺度,分别计算3个尺度下的弦角尖锐度均值,并将其累积作为角点响应函数;最后,根据每条轮廓各自的自适应阈值标记角点。实验结果表明,与现有的角点检测算法相比,该算法提高了噪声图像和模糊图像上角点的定位精度和抗噪声能力,并具有自适应性。  相似文献   

Sensitivity Analysis for Key Payloads and Orbital Parameters from the Next-Generation Moon-Gradiometer Satellite Gravity Program     

Wei Zheng  Houtse Hsu  Min Zhong  Meijuan Yun 《Surveys in Geophysics》2015,36(1):111-137

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上横山多层页岩矿床低强度相似材料试验模型研究     

叶义成  施耀斌  王其虎  姚囝  鲁方  岳哲 《岩土力学》2014,35(Z2):114-120

通过相似配比试验,研制不同砂胶比的低强度相似材料,分析了砂胶比和胶结材料中水泥含量对其物理和力学性质的影响及其变化规律。根据上横山多层页岩矿床赋存条件和相似模拟试验要求,确定了3个可行的、有效的相似材料配比,结合相似模拟条件构筑了多层页岩矿床相似材料模型。试验结果表明,相同砂胶比的低强度相似材料的密度、抗压强度、弹性模量和泊松比均随胶结材料中水泥含量的增加而增大;密度、孔隙率、弹性模量和泊松比在低砂胶比条件下具有更小的波动性。进一步研究发现,选择的低强度页岩相似材料实际相似常数与设计相似常数误差≤1.77%;利用数值模拟回采矿床矿柱的变形特征与相似模拟试验基本相似,应变变化幅度≤8.76%,试验模型在多层页岩矿床模型试验研究上具有一定的合理性。研究结果为有效的进行多层页岩矿床地下开采研究提供科学依据和试验基础。  相似文献   

Hf–Nd isotope constraints on the origin of the Cretaceous Caribbean plateau and its relationship to the Galápagos plume     

《Earth and Planetary Science Letters》2004,217(1-2):59-75

Formation of the Cretaceous Caribbean plateau, including the komatiites of Gorgona, has been linked to the currently active Galápagos hotspot. We use Hf–Nd isotopes and trace element data to characterise both the Caribbean plateau and the Galápagos hotspot, and to investigate the relationship between them. Four geochemical components are identified in the Galápagos mantle plume: two ‘enriched’ components with ϵHf and ϵNd similar to enriched components observed in other mantle plumes, one moderately enriched component with high Nb/Y, and a fourth component which most likely represents depleted MORB source mantle. The Caribbean plateau basalt data form a linear array in Hf–Nd isotope space, consistent with mixing between two mantle components. Combined Hf–Nd–Pb–Sr–He isotope and trace element data from this study and the literature suggest that the more enriched Caribbean end member corresponds to one or both of the enriched components identified on Galápagos. Likewise, the depleted end member of the array is geochemically indistinguishable from MORB and corresponds to the depleted component of the Galápagos system. Enriched basalts from Gorgona partially overlap with the Caribbean plateau array in ϵHf vs. ϵNd, whereas depleted basalts, picrites and komatiites from Gorgona have a high ϵHf for a given ϵNd, defining a high-ϵHf depleted end member that is not observed elsewhere within the Caribbean plateau sequences. This component is similar, however, in terms of Hf–Nd–Pb–He isotopes and trace elements to the depleted plume component recognised in basalts from Iceland and along the Reykjanes Ridge. We suggest that the Caribbean plateau represents the initial outpourings of the ancestral Galápagos plume. Absence of a moderately enriched, high Nb/Y component in the older Caribbean plateau (but found today on the island of Floreana) is either due to changing source compositions of the plume over its 90 Ma history, or is an artifact of limited sampling. The high-ϵHf depleted component sampled by the Gorgona komatiites and depleted basalts is unique to Gorgona and is not found in the Caribbean plateau. This may be an indication of the scale of heterogeneity of the Caribbean plateau system; alternatively Gorgona may represent a separate oceanic plateau derived from a completely different Pacific plume, such as the Sala y Gomez.  相似文献   

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郑伟  许厚泽  钟敏  员美娟 《大地测量与地球动力学》2012,32(3):152-159

?????????????GRACE Follow??On?????E.MOTION??Earth System Mass Transport Mission????????????????????о???????????????????Post??GRACE????????????????????????ο???????????????????????Post??GRACE??????????????????о??????????????????????????????????????????????????????????????????????????????????????о?????????????????????????????  相似文献   

Improved-GRACE����������������Ż��о�   总被引：12，自引：3，他引：9  

郑伟  许厚泽  钟敏  员美娟  彭碧波  周旭华 《大地测量与地球动力学》2010,30(2):43-48

???????????????????ü????????????????GPS????????λ????????????????????????????????????????????????????????????????Improved??GRACE?????????????????????????????????????????????1????300?????????350 km???????????????????????3.993??10 ^-1 m??????300 km??250 km???????????????????8.770????77.145????????400 km??450 km??????????????????8.718????75.307????2??????50 km???????????????????????3.993??10^-1 m??????110 km??220 km??????????????????1.259????1.395????3????????????Improved??GRACE????????????????????????????????350 km??50 km?????  相似文献