土壤水取样技术应用基础研究——土壤水提取量与土壤含水量关系   总被引：1，自引：0，他引：1       下载免费PDF全文

荆继红  韩双平 《地球学报》2001,22(4):380-383

土壤水取样技术在环境地质研究领域，特别是包气带污染质迁移，集聚研究，浅层地下水的污染预测与防治，盐渍土改良及农业生态研究等方面具有重要的应用价值。因而，以实验资料为依据。研究了土壤水取样技术某些重要应用基础问题，重点描述了土壤水取样器在4种不同岩性中的土壤水提取量与土壤含水量的关系，岩性中的土壤水提取量与土壤吸力的关系，并建立了相应的相关方程，以及对影响土壤水取样速率和取样量主要因素等问题进行了分析。  相似文献   

陕北浅层石油钻井的固控问题     

郭春生 《陕西地质》1997,(2)

通过计算对比，说明钻井过程的钻屑量，泥浆泵与钻杆的级配问题及钻井过程团相含量高的危害，对固相含量的要求，提出控制固相含量的措施等。  相似文献   

应用BP神经网络预测煤质参数及含气量   总被引：8，自引：0，他引：8       下载免费PDF全文

潘和平  刘国强 《地球科学》1997,22(2):210-214

煤层气储层物理结构以及煤层气的存储，运移等方面不同于常规天然气，评价煤质参数的测井等效体积模型难以较好地描述煤层这种复杂的物理结构，提出利用ＢＰ神经网络预测煤质参数及煤层气含量的模型和算法，预测的煤质参数以及煤层含气量与煤样分析结果比较表明，预测与煤样分析参数之间的平均绝对误差和相对误差都较小，精度满足定量计算的要求。  相似文献   

Terbuthylazine and Deethylterbuthylazine in Rain and Surface Water – Determination by Enzyme Immunoassay and Gas Chromatography/Mass Spectrometry     

A. Dankwardt  E. M. Thurman  B. Hock 《洁净——土壤、空气、水》1997,25(1):1-10

Rain and surface water samples from Southern Germany were investigated from 1991 to 1995 for terbuthylazine and one of its major metabolites, deethylterbuthylazine. The concentrations observed were compared to the concentrations found for atrazine and deethylatrazine in the same water samples. Concentrations ranged from < 0.02 μg/L to 0.7 μg/L for terbuthylazine and from < 0.02 μg/L to 0.6 μg/L for deethylterbuthylazine, compared to concentrations of < 0.02 μg/L to 3 μg/L and < 0.02 μg/L to 0.5 μg/L for atrazine and deethylatrazine, respectively. The ratios of metabolite concentrations to parent compound concentrations were calculated for deethylterbuthylazine to terbuthylazine (DTR) and deethylatrazine to atrazine (DAR). In rain water, DTR of 0.8…3.0 and DAR of 0.3… 1.9 were determined with mean values of 0.9… 1.7 for DTR and 0.6…0.9 for DAR in the different years. The ratios increased during summer periods. The highest ratios were observed in samples from forest stands, showing that degradation of the herbicide has occurred during transport between the source and the sampling site. The DTR in rain water were about 50… 100% higher than the DAR. This indicates a higher degradation rate of terbuthylazine during atmospheric transport. In surface water, DTR of 0.3… 1.2 with mean values of 0.5…0.8 and DAR of 0.2…2.2 with mean values of 0.2… 1.3 were observed. The ratios increased from June to September.  相似文献   

新疆阿克苏盐化潮土盐分特征及利用中存在的问题     

沈玉凌 《干旱区地理》1997,20(4):78-83

新疆阿克苏地区盐化潮土盐分组成为硫酸钙类型。具有面积大，连片分布的特点。虽然盐分具有一定的表聚性，但表聚程度较弱。从盐化潮土在阿克苏地区的分布，盐分在土壤剖面的分以及塔里木河流域水资源合理利用的角度而言当地通过种稻洗盐改良盐化潮土的作法是不合理的。  相似文献   

西太平洋热带海域的水汽和云的变化特性     

王普才  忻妙新  魏重 《大气科学》1991,15(5):11-17

本文依据1987年9—11月西太平洋热带海域海洋大气综合考察中双波长微波辐射计观测系统和红外窗区辐射计所得到的观测资料,分析研究了考察海域的水汽和云的变化特性,得到了一些有意义的结果。双波长微波辐射计观测系统可以获得水汽场的动态变化和云中液态水的演变;西太平洋海域的个例显示出辐合区的垂直气柱水汽含量比非辐合区的明显大的特征;用红外亮度温度可以近似估计晴空大气垂直气柱水汽含量。  相似文献   

Mechanical behaviour of deep rock core samples from a seismically active gas field     

D. Fabre  J. -R. Grasso  Y. Orengo 《Pure and Applied Geophysics》1991,137(3):201-219

This study concerns the laboratory testing of core samples from massive sedimentary rocks from an oil and gas field. The depth of extraction of the samples analysed varies between 1000 and 5000 metres. In all, 65 tests were performed, most of which included systematic measurement of acoustic activity during loading. The aim of the testing was to determine which types of fracture could occur in the rock matrix under field-stress conditions by examining in particular the relationship between confining pressure and the transition from brittle to ductile behaviour. The results of the laboratory tests are used to predict the occurrence of seismic activity resulting from the depletion of the gas reservoir which has been monitored during the last twenty years.  相似文献   

海康盐场井水化离子与地震关系初探     

吴运恒 《华南地震》1991,11(3):75-79

本文对广东省海康盐场339^#深井8年来的水化观测资料进行了初步分析，认为该井Cl^-含量和Ca^ Mg^ 合量的下尝稳定型的，它们与气象等外界因素影响无明显关系，对一定范围内的地震活动具有震兆显示能力。  相似文献   

伽玛测井多点式反褶积法及其负值含量问题的讨论     

汤彬  陆玲 《铀矿地质》1991,7(2):99-107

  相似文献   

陕西泾阳冬小麦农田土壤水分的动态模拟研究     

周英 《南京气象学院学报》1992,15(2):73-81

  相似文献