共查询到20条相似文献，搜索用时 46 毫秒
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简要介绍了金坛盐矿的发展及现状,分析了盐矿在短短几年时间内由年赢利大户变为亏损行业的原因,就盐矿的出路提出了6条建议. 相似文献
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近日,记者从河北省国土资源厅获悉,河北省煤田地质二队在宁晋县探明一处资源储量达16．16亿t的大型石盐矿,该矿不仅填补了河北石盐矿床的空白,而且对今后在华北平原区寻找类似石盐矿具有重要指导意义。 相似文献
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老挝东泰钾盐矿区矿床控矿因素探析 总被引：1，自引：0，他引：1
通过对区域地质、构造和岩相古地理的研究,从成矿阶段的角度,将控矿因素分为背景控矿因素、沉积控矿因素、改造控矿因素。得出:背景因素为区域性盆地沉积环境形成条件;沉积控矿因素直接控制了工区石盐矿层的层理形态;改造控矿因素中,局部构造对矿层的改造是矿区盐层多呈背斜分布且轴部较两翼矿层大幅变厚的原因,钾石盐出现在光卤石矿层顶部是因为上部裂隙水或者封存的老卤水向下侵蚀光卤石矿层顶部,溶蚀了溶解度相对较大的MgCl2,而溶解度相对较小的KCl被保留下来,从而多在上盐层光卤石矿顶部形成再生或次生钾石盐矿。 相似文献
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近日,《大口径绳索取芯技术在深部成盐盆地中的试验研究》项目,在郑州通过了河南省国土资源厅组织的专家鉴定。该项目由河南省地矿局地热能开发利用有限公司、中国地质大学(武汉)、河南省地矿局深部探矿工程技术研究中心、第二地质环境调查院合作完成。项目负责人、教授级高工卢予北介绍,项目在沉积地层 相似文献
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河南省土地资源调查评价项目是新一轮国土资源调查评价工作的重要组成部分，它包括耕地后备资源调查评价与坡耕地调查评价。2000年6月，河南省国土资源厅以豫土文[2000]167号文，下发了《河南省土地资源调查评价实施方案》，并成立了土地资源调查评价领导小组。领导小组下设办公室和技术指导组，办公室设在地籍处，技术指导组设在省土地勘测规划院，分别负责土地资源调查评价工作的组织协调和项目的具体实施。 经过半年多的努力工作，第一次查清了我省耕地后备资源和坡耕地的数量、权属、分布、质量情况，为西部大开发退耕还林、还草以及… 相似文献
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1 矿井开采工艺1.1 单井对流1964年,俄罗斯巴什基尔有9口双管单井对流井,寿命最短的几个月,最长的10年.盐层埋深500 m～700 m,盐层厚度200 m,上溶速度24 cm/d,大于侧溶速度2倍,开采丢矿多.采出40万m3后顶板就垮塌了,采收率K为0.02(2%).要提高采收率的关键是控制上溶速度,加大侧溶速度. 相似文献
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以陈家庄盐矿为研究对象,对原岩卤水中Ca2+含量的变化进行分析,同时也对用CaCl2为原料的精制卤水中Ca2+含量的变化进行了分析,从Ca2+在卤水中溶解度的角度出发,提出降低Ca2+含量(同时降低卤水中SO42-的含量)的几种方法. 相似文献
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顶进力是顶管工程设计和施工中最重要的参数之一, 顶进力计算的精确性将直接影响顶管的工程的成败。随着顶管施工工艺越来越多的应用于岩石地层, 但鲜有关于岩石地层中顶管顶进力的计算模型。为了更加准确地计算岩石地层中的迎面阻力, 假设掌子面稳定, 通过分析岩石顶管机刀盘滚刀破岩机理、受力模型和影响规律, 在此基础上推导出岩石地层顶管迎面阻力计算公式。结果表明: 岩石顶管中, 岩石抗压强度和抗剪强度以及顶管机滚刀切入深度直接决定了迎面阻力的大小, 实测迎面阻力除个别点在计算值上下限以外, 其余与公式预测值相一致, 证明其具有适用性。 相似文献
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由于崩滑-碎屑流具有高隐蔽性、发生时间短暂以及较低的可预见性,较难直观观测崩滑-碎屑流发生的过程。为了对碎屑动力特性及对房屋的破坏情况进行研究,拟对碎屑流堆积体及其粒径分布进行分析。以普洒村崩塌-碎屑流为例,使用PCAS系统对碎屑流堆积体图像进行颗粒识别、统计,并通过量纲分析法,分析堆积体颗粒与房屋破坏之间的定量联系。分析结果发现:与现场筛分统计相比,图像识别堆积体颗粒的方法得到的数据更全面、详细,并且能节省大量的人力、物力资源。另外,对房屋与碎屑流之间的相互作用进行了探究,发现房屋对碎屑流颗粒有"拦粗排细"的作用。同时,利用图像识别得到的颗粒粒径数据对推导出房屋破坏的判别公式,判别效果较好,能够在地质灾害防治、预测领域发挥一定作用。 相似文献
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Natalya Mirzoyeva Larisa Gulina Sergey Gulin Olga Plotitsina Alexandra Stetsuk Svetlana Arkhipova Nina Korkishko Oleg Eremin 《中国海洋湖沼学报》2015,33(6):1413-1425
90 Sr concentrations,resulting from the Chernobyl NPP accident,were determined in the salt lakes of the Crimea(Lakes Kiyatskoe,Kirleutskoe,Kizil-Yar,Bakalskoe and Donuzlav),together with the redistribution between the components of the ecosystems.The content of mercury in the waters of the studied reservoirs was also established.Vertical distributions of natural radionuclide activities( 238 U,232 Th,226 Ra,210 Pb,40 K) and anthropogenic 137 Cs concentrations(as radiotracers) were determined in the bottom sediments of the Koyashskoe salt lake(located in the south-eastern Crimea) to evaluate the longterm dynamics and biogeochemical processes.Radiochemical and chemical analysis was undertaken and radiotracer and statistical methods were applied to the analytical data.The highest concentrations of 90 Sr in the water of Lake Kiyatskoe(350.5 and 98.0 Bq/m 3) and Lake Kirleutskoe(121.3 Bq/m 3) were due to the discharge of the Dnieper water from the North-Crimean Canal.The high content of mercury in Lake Kiyatskoe(363.2 ng/L) and in seawater near Lake Kizil-Yar(364 ng/L) exceeded the maximum permissible concentration(3.5 times the maximum).Natural radionuclides provide the main contribution to the total radioactivity(artificial and natural combined) in the bottom sediments of Lake Koyashskoe.The significant concentration of 210 Pb in the upper layer of bottom sediments of the lake indicates an active inflow of its parent radionuclide—gaseous 222 Rn from the lower layers of the bottom sediment.The average sedimentation rates in Lake Koyashskoe,determined using 210 Pb and 137 Cs data,were 0.117 and 0.109 cm per year,respectively. 相似文献
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Absolute geostrophic currents in the North Pacific Ocean are calculated using the P-vector method and gridded Argo profiling data from January 2004 to December 2012. Three-dimensional structures and seasonal variability of meridional heat transport (MHT) and meridional salt transport (MST) are analyzed. The results show that geostrophic and Ekman components are generally opposite in sign, with the southward geostrophic component dominating in the subtropics and the northward Ekman component dominating in the tropics. In combination with the net surface heat flux and the MST through the Bering Strait, the MHT and MST of the western boundary currents (WBCs) are estimated for the first time. The results suggest that the WBCs are of great importance in maintaining the heat and salt balance of the North Pacific. The total interior MHT and MST in the tropics show nearly the same seasonal variability as that of the Ekman components, consistent with the variability of zonal wind stress. The geostrophic MHT in the tropics is mainly concentrated in the upper layers, while MST with large amplitude and annual variation can extend much deeper. This suggests that shallow processes dominate MHT in the North Pacific, while MST can be affected by deep ocean circulation. In the extratropical ocean, both MHT and MST are weak. However, there is relatively large and irregular seasonal variability of geostrophic MST, suggesting the importance of the geostrophic circulation in the MST of that area. 相似文献
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《中国海洋湖沼学报》2018,(6)
Investigations of ~(239+240)Pu and ~(238)Pu in the surface layer(0–5 cm) of bottom sediment in the Crimean 10 salt lakes from 4 geographical groups were carried out for the first time. The ~(239+240)Pu varied widely between regional geographical groups of lakes as well as within groups too and ranged from 11±4 to 451±43 mBq~(239+240)Pu/kg. The highest levels of ~(239+240)Pu—419±27, 443±24 and 451±43 mBq/kg were observed in the Yevpatoriya(Lake Kyzyl-Yar), the Tarkhankut(Dzharylhach) and the Kerch group(Tobechik), respectively. The lowest values of ~(239+240)Pu were identified in three lakes of the Perekop group and were 20±12, 24±6 and 48±6 mBq/kg. In all lakes ~(238)Pu was an order of magnitude lower than 239+240 Pu and varied from 4.8±2.6 to 30.7±5.5 mBq/kg. The ~(238)Pu activity was decay-corrected to 1986. The characteristic ratio of the ~(238)Pu/239+240 Pu activities in the sediment and percentage of the Chernobyl-derived Pu was calculated. The largest percentages of the Chernobyl-derived Pu were observed in the Evpatoriya group(Lake SasykSivash)—16.2%±8.26%, the Tarkhankut group(Dzharylhach)—8.4%±2.10% and the Kerch group(Aktash)—10.5%±5.56%. The study of the depth distribution of plutonium in the Lake Kyzyl-Yar bottom sediment core(0–25 cm) was fulfilled. It was shown that 239+240 Pu was high enough in all studied layers of bottom sediment, but the highest activity ratio ~(238)Pu/239+240 Pu(0.062±0.020) was found in the deepest layer of 15–20.5 cm and the percentage of Chernobyl-derived Pu was estimated at 6.8%±2.85% in this layer. 相似文献
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Histogenesis of the immune system and specific activity of superoxide dismutase(SOD) were studied in rock bream Oplegnathus fasciatus from fertilization to 50 days after hatching(DAH).The pronephric tubule primordium developed in the embryo,14 h 30 min post fertilization.The spleen anlage was observed between the swim bladder and the intestine at 5 DAH,and the thymus was formed as a paired structure under the pharyngeal epithelium above the gill arch at 10 DAH.The order of the immune organs becoming lymphoid was the pronephric kidney(10 DAH),thymus(15 DAH) and spleen(21 DAH).As the embryo developed,the specific activity of SOD gradually increased until hatching,but subsequently SOD activity continuously decreased to a minimum at 14 DAH.After the spleen became lymphoid,the specific activity of SOD was relatively stable.It is suggested that the immaturity of the lymphoid organs and low specific activity of SOD was the cause of the high mortality of fingerlings 12 to 16 DAH. 相似文献
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成岩作用是碳酸盐岩储层的重要成因之一,也是控制碳酸盐岩储层评价和预测的重要地质因素。首先概括了碳酸盐岩成岩研究的技术方法,重点剖析了溶蚀作用、白云石化作用、胶结作用、新生变形作用、硅化作用、压实作用和压溶作用的成岩机理及最新认识,归纳总结了生物扰动、构造破裂、烃类充注及微生物等成岩作用的辅助因素。碳酸盐岩成岩作用研究对象从礁滩和微生物岩逐步拓展到潟湖、混积岩及冷水沉积等领域。分析了构造-层序控制下成岩环境和成岩作用的演变,根据沉积能量和成岩性质划分出5种沉积环境-成岩作用组合。碳酸盐岩成岩作用研究存在问题包括：成岩模拟系统与真实地层环境差异大;成岩术语不规范、成岩模式理想化和单一化;潟湖、深水和冷水等非常规碳酸盐岩研究程度低;成岩作用的双刃性及对储层改造的定量化研究不足。指出了碳酸盐岩成岩作用研究的发展趋势：通过结合地层埋藏史,实验模拟方法将逐步趋向真实埋藏环境,成岩模拟软件不断实现模块集成化和智能化;成岩模式更加精细且更具针对性,成岩作用对储层的改造实现定量化研究;非常规碳酸盐岩成岩机理研究更加健全。 相似文献
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Soil shear strength is an important indicator of engineering design and an essential parameter of soil precision tillage and agricultural machinery and equipment design. Although numerous studies have investigated the characteristics of different soil shear strengths, only a few of these works have paid attention to soils containing considerable quantities of rock fragments. To date, most studies on the effects of rock fragments on the shear strength have paid attention to the role of rock fragments with sizes >2 mm. The effects of rock fragments <2 mm in soil are generally ignored. Similar to rock fragments >2 mm, the presence of rock fragments <2 mm could also change the mechanical properties of soils. Thus, in the present study we evaluated the potential influence of <2 mm rock fragments on soil shear strength via an unconsolidated undrained (UU) triaxial compression test. Our results were as follows: (1) A certain quantity of <2 mm rock fragments presented in purple soils developed from clay rocks; and an appropriate quantity of <2 mm rock fragments could improve the shear strength of soils. (2) The different PSDs of soils containing <2 mm rock fragments mainly caused variations in the internal friction angle of soils. (3) The shear strengths of the two mudstone-developed red-brown and gray-brown purple soils was more sensitive to water than that of the shale-developed coarse-dark purple soil. As the soil water content increased from 9% to 23%, the changes in the cohesion, internal friction angle, shear strength, and the maximum principal stress difference were smaller in the coarse dark purple soil than in the two other soils. We therefore concluded that <2 mm rock fragments in purple soils exerted important effects on soil shear strength. A better understanding of the differences among the shear strength features of purple soils could help improve the design of agricultural machinery and equipment. 相似文献