天然气化探异常机理探讨及其在勘探中的意义     

张彦霞  荣发准  赵克斌 《安徽地质》2001,11(3):215-219

天然气在地质体中运移过程中留下示踪痕迹，通过化探的方法，结合地质、地球物理方法，确定近地表地球化学效应或井下地球化学效应，为油气的进一步勘探提供地质资料和参考价值。  相似文献   

塔里木盆地东部地区天然气地球化学特征及成因探讨(之二)   总被引：17，自引：2，他引：17  

陈践发  徐永昌  黄第藩 《沉积学报》2001,19(1):141-144

天然气的组分和碳、氢同位素组成特征研究表明塔里木盆地已发现的天然气均为热解气。通过气源对比可知,该盆地东部地区的天然气主要有两种类型 :1)是来自震旦纪到下古生界海相腐泥型母质的油型气,其甲烷、乙烷、丙烷δ13C值,分别为-44.5‰～-33.8‰、- 42‰～-2 8.1‰和-35.4‰～-2 8.4‰,其甲烷的氢同位素组成大于- 2 0 0‰;2 )是产自中生代陆相腐殖型源岩的煤型气,其甲烷、乙烷、丙烷的δ13C值分别为-40.5‰～-33.1‰、- 2 9.7‰～-2 1.3‰和-2 6.3‰～-2 0.3‰,其甲烷的氢同位素组成小于-2 0 0‰。将天然气的地化特征与地质背景相结合判断可知,在塔北隆起地区一些天然气藏是由成熟 (高成熟 )阶段的油型气与过成熟阶段的油型气混合形成,另一些天然气藏是由成熟阶段的油型气和成熟阶段的煤型气混合形成.  相似文献   

天然金刚石的定向红外光谱研究   总被引：2，自引：2，他引：2  

杨志军  彭明生  苑执中 《矿物学报》2001,21(3):393-396

本文对天然金刚石在垂直于（100）、（110）和（111）三个方向上定向红外光谱进行了定量比较分析，指出C－H键和C－C键在以上三个方向上的浓度不相同，引起C－C键和C－C键在不同方向上的浓度差异是由于氢具有优先取代垂直于（111）方向上C－C键中碳原子的倾向。  相似文献   

环境矿物材料基本性能：无机界矿物天然自净化功能   总被引：53，自引：23，他引：53       下载免费PDF全文

鲁安怀 《岩石矿物学杂志》2001,20(4):371-381

重点阐述环境矿物材料基本性能，包括矿物表面吸附、孔道过滤、结构调整、离子交换、化学活性、物理效应、纳米效应及与生物交互作用等，旨在发掘、凝炼并新提出物理方法和化学方法之后与有机界生物同效的无机界矿物天然自净化功能的基础理论与应用方法，以发展和完善无机矿物与有机生物所共同构筑的自然界中存在的天然自净化系统，并就目前笔者在黄铁矿、锰钾矿、金红石、蛭石、蒙脱石、苋铁铁钒等天然矿物方面已经完成和正在开展的一系列环境矿物材料研究工作进行了举例说明。  相似文献   

天然锰钾矿吸附水溶液中Hg^2＋的实验研究   总被引：6，自引：3，他引：6       下载免费PDF全文

郑德圣  鲁安怀  秦善  姜浩  郑喜珅  赵谨 《岩石矿物学杂志》2001,20(4):559-564

利用粉碎分级的天然锰钾矿去除水溶液中Hg^2 的实验研究表明：反应平衡时间约为20小时；pH值对其吸附率影响很大，在中性（氯化物在偏碱性）条件下吸附率较高；溶液中阳离子的存在会产生竞争吸附而降低对Hg^2 的吸附量，2价金属离子较1价金属离子对Hg^2 竞争干扰明显；溶液中Cl^-的存在能明显降低对Hg^2 的吸附量。对等温吸附曲线的回归分析得出在浓度为5～350mg/L段能很好地符合Langmuir单吸附位吸附曲线，并计算出在该实验条件下其最大理论吸附量为27.6mg/g。解吸实验结果表明，在无其他电解质参与的条件下解吸量较少，受多种电解质干扰时其解吸率不超过20%。  相似文献   

Environmental protection in the Apuseni Mountains: The role of Environmental Non-Governmental Organisations (ENGOs)     

Mircea Buza  Levente Dimen  Grigor Pop  David Turnock 《GeoJournal》2001,55(2-4):631-653

The Apuseni Mountains constitute one of the most interesting parts of the Carpathians in terms of landscape, biodiversity and culture. Yet dislocations are now severe and there are development threats which also require a significant response. On the one hand there are some severe pollution problems associated with mining areas developed in the communist period which require remedial action and the cases of Roşia Montana and Zlatna are discussed. On the other hand, there are forest and pasture zones – especially the Padiş Plateau – which are coming under heavy pressure from farmers seeking to enhance their incomes following the decline of mining and manufacturing which has left many households without salaries. At the same time, tourist pressure is growing. Actions are already being taken to limit pollution damage and develop sustainable landuse practices. There is a national park project linked with nature reserves comprising picturesque landscapes, a rare flora and fauna and distinct geological and palaeotological formations (including fossil ice). There are major tourist attractions and with proper management they could become part of a development programme of the countryside. However it is essential that all stakeholders adopt sustainable practices and this means that official programmes – including the future national park authority administration's work in environment protection and tourism management – are backed up by Environmental Non-Governmental Organisations (ENGOs). The paper reviews their diverse activities and concludes that they are making a very substantial contribution in ensuring that the potentials of isolated regions can be utilised in a manner consistent with nature conservation. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

An Overview of Dissolved and Suspended Matter Fluxes in the Loire River Basin: Natural and Anthropogenic Inputs   总被引：7，自引：0，他引：7  

Cécile Grosbois  Philippe Négrel  Daniel Grimaud  Christian Fouillac 《Aquatic Geochemistry》2001,7(2):81-105

The spatial and temporal distributions of major elements were investigated in the surface waters and in associated suspended matter at two sites of the upper Loire basin (Orleans and Brehemont) between 1995 and 1998.According to geochemical and isotopic patterns, the dissolved load appears to result from a process of mixing rainwater inputs, weathering processes of carbonate and silicate bedrock, and agricultural and urban inputs. Natural inputs influence 60% of water chemical composition at both sites. Annual dissolved fluxes were estimated to be 1300 10³ t/y at Orleans and 1620 10³ t/y at Brehemont. Major elements are transported mainly in the dissolved fraction. After correcting for atmospheric and anthropogenic inputs, the silicate specific export rate was calculated to be 11 t/y/km² throughout the basin and the carbonate specific export rate to be from 47 t/y/km² at Orleans to 23 t/y/km² at Brehemont.The suspended load appears to result from at least two particle reservoirs: a silicate reservoir and a carbonate reservoir. The silicate reservoir has a detrital origin, mainly during periods of high flow, while the carbonate reservoir has a detrital origin during periods of high flow and an authigenic origin during periods of low flow. Of the total annual flow of suspended matter, this authigenic material represents 16% at Orleans, 25% at Brehemont and 37% in the fluvial part of the estuary. After correcting authigenic inputs, the specific export rate due to mechanical weathering was estimated to be 8 t/y/km² throughout the Loire basin.  相似文献   

基于扩展SQL的GIS模糊查询的表达与实现   总被引：5，自引：0，他引：5  

黄波 《武汉大学学报(信息科学版)》1996,(1)

模糊查询通常包含模糊单词和３种算子──语气算子、模糊化算子和判定化算子。通过模糊集合论，可表示这些模糊概念。在此基础上，介绍了一种扩展ＳＱＬ表达模糊查询，并将其转化为标准ＳＱＬ加以实现的方法。  相似文献   

Pre-seismic characteristics of electromagnetic radiation and natural geoelectric potential in Fujian and Taiwan Area     

Bao-Hua Chen  Sheng-Ming Huang  De-Rong Yang 《地震学报(英文版)》1996,9(3):523-529

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陕西秦巴山区垂直自然带的土地演替     

刘胤汉  杨东朗  刘彦随  岳大鹏 《山地学报》1996,(1)

以陕西秦巴山区为案例，对土地演替的内涵、研究内容和演替历史做了论述，运用遥感技术编制土地类型图，运用计算机手段对秦岭南、北坡和大巴山北坡的不同垂直带层的土地演替做了模拟．认为土地演替是土地内部物流与能流转化迁移的结果，土地演替分为自然演替和人为演替两种过程．  相似文献