四川省XXX磷矿区布设沿脉工程的尝试     

张玉龙  刘凯  李修杰 《化工矿产地质》2013,(2):95-99

四川XXX磷矿位于扬子准地台西部著名的川滇成磷带。磷矿赋存于寒武系下统麦地坪组中段。地质条件简单,矿层分布稳定。邻区有已勘探开发的同类型磷矿。鉴于此,为满足业主工程进度的要求,采用在首采区布设沿脉坑道工程,作为加密勘探工程,为矿区首采区开采设计提供依据。  相似文献   

基于核磁共振不同煤岩类型储渗空间精细描述          下载免费PDF全文

刘玉龙  汤达祯  许浩  赵俊龙  李冰洋 《高校地质学报》2016,22(3):543

为了深入探究不同煤岩类型储渗空间的特征及其差异性,选取了韩城矿区4种不同煤岩类型的中煤阶样品,采用低 场核磁共振技术,实现了对韩城矿区不同煤岩类型孔裂隙的识别和有效孔隙度差异性的精细描述和定量表征,并在此基础 上基于离心前后累计振幅曲线求取了孔裂隙系统划分的阀值T2C1和T2C2,实现了对不同煤岩类型孔径结构分布的重构。实验 结果表明：不同煤岩类型煤样的T2谱形态差异较大,从光亮煤到暗淡煤,T 2谱由双峰大孔隙型逐渐过渡到双峰小孔隙型, 且T2C截止值和有效孔隙度均呈现出逐渐降低的趋势;并由求取的阀值T2C1和T2C2计算得到的三大孔裂隙系统孔径分布可知, 从光亮煤到暗淡煤,储层的孔裂隙结构由渗流孔型逐渐向综合型和扩散孔型过渡。  相似文献   

基于贝叶斯网络的地震相分类     

顾元  朱培民  荣辉  曾凡平  海洋 《地球科学》2013,38(5):1143-1152

为了解决传统多地震属性的地震相分类方法中"难以引入先验信息用以指导分类,难以给出地震相分类结果可靠程度的定量估计,且各分类参数的权值较难确定"这3个问题,提出了一种新的基于贝叶斯网络的地震相分类方法.该分类方法有效地融合了先验信息和训练样本的分布特征,对提取的多种地震属性进行智能分析,以概率推理的方式得到各地震相类别的概率值,并根据概率分布估计分类结果的可靠程度.详述了贝叶斯网络用于地震相分类的原理与方法,并结合理论地震数据,验证了该方法的可行性和正确性.   相似文献   

滨河湿地地表水文评价指标与实例分析   总被引：1，自引：1，他引：0  

海燕  贾忠华  罗纨 《湿地科学》2008,6(2)

基于洪水脉动理论,在归纳总结滨河湿地水文对滨河湿地生态系统影响因子的基础上,确立以淹没次数、淹没频率和淹没持续时间作为滨河湿地的水文评价指标,并以西安泾渭湿地为例,研究了1951年以来泾渭湿地地表水文变化。结果表明,与20世纪60年代相比,90年代泾渭湿地的淹没频率降低了69％以上;与1985年以前相比,1986～2000年的淹没持续时间也减小了80％左右;在5～10月期间,各月的淹没次数在20世纪90年代最少。  相似文献   

Compositions and constituents of freshwater dissolved organic matter isolated by reverse osmosis     

Yulong Zhang  Wen Huang  Yong Ran  Jingdong Mao 《Marine pollution bulletin》2014

Dissolved organic matter (DOM) from riverine and lacustrine water was isolated using a reverse osmosis (RO) system. Solid-state ¹³C nuclear magnetic resonance (¹³C NMR) was used to quantitatively evaluate the compositions and constituents of DOM, which are compared with previous investigations on marine DOM. Results indicated that concentration factor (CF) was a key metric controlling yield and sorption of DOM on the RO system. The sorption was likely non-selective, based on the ¹³C NMR and δ¹³C analyses. Carbohydrates and lipids accounted for 25.0–41.5% and 30.2–46.3% of the identifiable DOM, followed by proteins (18.2–19.8%) and lignin (7.17–12.8%). The freshwater DOM contained much higher alkyl and aromatic C but lower alkoxyl and carboxyl C than marine DOM. The structural difference was not completely accounted for by using structure of high molecular weight (HMW) DOM, suggesting a size change involved in transformations of DOM during the transport from rivers to oceans.  相似文献   

Presence of Semi‐Volatile Organic Contaminants in Shallow Groundwater of Selected Regions in China     

Liang Chen  Song Jin  Yulong Liu  Fei Liu 《Ground Water Monitoring & Remediation》2014,34(4):33-43

A pioneering investigation of semi‐volatile organic compounds (SVOCs) in shallow groundwater in China was hereby reported. Representative groundwater samples were collected from three selected regions: Eastern Hai River Plain, Yangtze River Delta, and Yunnan‐Guizhou Plateau, and analyzed for 103 SVOCs linked to agricultural and industrial practices. Analytical results showed that 70 of the 103 SVOCs were present in the groundwater samples, a detection frequency of approximately 86%. Compounds detected most frequently included P,P′‐DDT (53.49%, MDL 0.0007 µg/L), 2,4‐dinitrotoluene (51.16%, MDL 0.02 µg/L), and phenol (51.16%, MDL 0.02 µg/L). Fifteen SVOCs, such as P,P′‐DDT, 2,4‐dinitrotoluene, heptachlor, and aldrin, were detected at concentrations exceeding the USA National Recommended Water Quality Criteria‐2009 (USNRWQC‐2009). Most of these 15 SVOCs belong to polycyclic aromatic hydrocarbons and organochlorine pesticides. The detection of SVOCs in the Yunnan‐Guizhou Plateau warrants special concern, since this region has limited human activities and been assumed as an environmentally pristine area. The data from this work are expected to contribute to the database of contemporary groundwater quality in China.  相似文献   

办公自动化系统安全性初探     

王颖  王建兵  肖伟  吴玉龙 《国土资源信息化》2012,(3):48-50

国土资源部机关办公自动化系统已全面部署并投入使用,如何保障系统的安全性、真实性、有效性成为系统建设及应用过程中不容忽视的问题。本文从电子公文的特性入手,结合部机关办公自动化,对多个安全技术进行了探讨,并对进一步安全部署提出了思路。  相似文献   

"伊布都"台风影响云南的暴雨过程分析   总被引：24，自引：13，他引：11  

郭荣芬  鲁亚斌  李燕  海云莎  高敏琪 《高原气象》2005,24(5):784-791

利用Micaps常规资料,采用FY-2卫星红外增强云图及昆明CINRAD-CC雷达资料,分析了2003年7月25日20：00～26日20：00由于“伊布都”台风低压西行引发的云南暴雨过程。结果表明,由于副热带高压的西伸加强,其西侧持续强盛的低空偏南急流使西移到云南的热带低压维持并加强,在此有利的大尺度背景下,使云南境内的台风低压云系由MβCS发展为MαCS-MCC;通过K指数、θse特征、非地转湿Q矢量及非地转湿Q矢量散度等的分析,发现高能、高湿不稳定能量的积聚、低层的水汽辐合是此次暴雨过程的触发机制;地形的抬升导致低压发展,是暴雨产生的重要原因之一;多普勒雷达回波显示,台风低压有明显较大尺度的气旋式螺旋带状回波结构,并伴有多条强回波短带的出现及合并;在多普勒雷达速度图上,逆风区、气旋式辐合、大风区、持续的暖平流是造成本次暴雨过程直接的中小尺度天气系统。  相似文献   

Chemical weathering in Luzon, Philippines from clay mineralogy and major-element geochemistry of river sediments   总被引：3，自引：0，他引：3  

Zhifei Liu  Yulong Zhao  Christophe Colin  Fernando P. Siringan  Qiong Wu 《Applied Geochemistry》2009,24(11):2195-2205

Clay mineralogy and major-element geochemistry of 35 surface sediment samples collected in 21 major to moderate rivers of Luzon, Philippines are used to evaluate the present chemical weathering process. The clay mineral assemblage consists mainly of smectite (average 86%) with minor kaolinite (9%) and chlorite (5%) and very scarce illite (1%), and does not show strong island-wide differences. The major element results of both bulk and clay-fraction sediments indicate that the formation of clay minerals is accompanied by leaching of Ca and Na first and of Fe and Mn thereafter during the chemical weathering process. A low-moderate chemical weathering degree of bulk sediments and a moderate-intensive degree of clay-fraction sediments are obtained in Luzon rivers based on proxies of chemical index of alteration (CIA) and smectite crystallinity. It is suggested that the majority of andesitic–basaltic volcanic and sedimentary rocks along with the tectonically active geological setting and sub-tropical East Asian monsoon climate are responsible for the predominance of smectite in the clay mineral assemblage.  相似文献   

基于三维随机水文地质结构模型的地下水流数值模拟: 以西辽河平原为例     

孙倩  邵景力  崔亚莉  王玉龙  薛俊环  马涛 《现代地质》2019,33(2):451-460

为了探究水文地质结构对地下水流数值模拟的不确定性,可以运用随机模拟建立地下水位的预测模型。根据转移概率地质统计方法模拟多孔介质岩性分布,利用非线性规划的思路计算岩性与水文地质参数之间的关系,从而建立相对精确的随机水文地质参数场。将不同的水文地质参数场运用到MODFLOW中,得到不同的随机模拟结果。通过比较随机模型和确定模型的末流场拟合情况以及水位动态拟合图,发现确定模型和随机模型具有相似趋势,都能与实测流场拟合较好,但是随机模型更能体现真实的水文地质特征。对随机模型预测10年后的地下水水位做不确定性分析,得到水位平均变幅介于-5～5 m之间,且95%置信度水位变幅的平均上限线约为0.146 m。研究结果为决策者提供科学依据。  相似文献