EFFECTS OF WATERSHED RECLAMATION ON INFLOW AND SEDIMENT LOAD IN THE FENHE RESERVOIR     

YAO Jingang  ZHANG Yuli 《国际泥沙研究》1999,(1)

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅＦｅｎｈｅＲｅｓｅｒｖｏｉｒｗａｓｉｍｐｏｕｎｄｅｄｉｎ１９６１ｗｉｔｈｔｏｔａｌｓｔｏｒａｇｅｃａｐａｃｉｔｙｏｆ７２０ｍｉｌｉｏｎｍ３．ＩｔｉｓｔｈｅｌａｒｇｅｓｔｒｅｓｅｒｖｏｉｒｉｎＳｈａｎｘｉＰｒｏｖｉｎｃｅ...  相似文献   

徐家河水库近太湖新银鱼(Neosalanx pseudotaihuensis Zhang)的性腺发育与产卵类型(英文)     

王卫民  AMARARATNEYakupitiyage 《湖泊科学》1999,(4)

银鱼生产的发展是通过银鱼的引种来实现的,银鱼的引种主要是采取向水体投放受精卵的方式来完成,受精卵又是通过人工繁殖而获得银鱼的人工繁殖不同于常规养殖鱼类,因其一经捕起很快就会死亡而不能进行人工催产因此银鱼人工繁殖的亲本是在银鱼的繁殖季节从天然水体中捕捞而获得,而大量的性成熟好的、可以立即进行人工受精的亲本只能在产卵高峰期才能捕获得到．所以了解并掌握银鱼的性腺发育规律和产卵时期对银鱼的人工繁殖十分重要 １９９２年４月至１９９６年５月在湖北省徐家河水库对近太湖新银鱼的性腺发育规律和产卵时期进行了长期的研究,并从１９９５年５月至１９９６年４月（银鱼的一生）周年标本中逐月进行了组织切片通过对近太湖新银鱼（Neosalanx pseudotaihuensis）卵细胞的组织学研究表明该鱼为分批产卵类型根据卵巢外部形态和内部组织结构,建议将近太湖新银鱼的卵巢划分为六个阶段;从卵巢每月发育期趋势和卵细胞大小以及卵的成熟度得出近太湖新银鱼的产卵期为３－５月,其中４月中旬至５月中旬为产卵高峰期;根据体长频率分布来看,近太湖新银鱼产完最后一批卵就死亡,因此,它的寿命仅一年从其周年体长和成熟系数分布并结合秋季大捕捞大量样本的检查,得出近太湖新银鱼只有春季产卵群  相似文献   

水库渔业营养类型划分标准研究──1.指标层次的确定     

戴泽贵  曹克驹 《湖泊科学》1999,(3)

依据１９８０－１９９２年全国２０个省５５座水库渔业资源调查数据,运用Ｒ型聚类分析和主成分分析方法对４８项指标间的层次性进行分析,水库渔业营养类型划分标准的指标层次体系可确定为：第一大层次（水库形态与自然环境）包括地理,气候,水深,面积和体积．土壤．水文等６个小层次;第二大层次（水的理化性质）包括主要离子,磷素,有机物,溶解气体,氮素等５个小层次;第三大层次（生物学）包括浮游植物,浮游动物,初级生产力,鲢鳙生长等４个小层次．  相似文献   

吐哈盆地台北凹陷储集层岩石学特征     

刘林玉  魏国彪 《西北地质科学》1999,20(1):23-26

根据岩石铸体薄片和扫描电镜观察资料,分析了吐哈盆地台北凹陷中侏罗统储集层的岩性特征。七克台组中上部储集层以岩屑砂岩为主,属于第一岩性段．七克台组下部一西山窑组储集层以长石岩屑砂岩为主,属于第二岩性段．砂岩的岩性特征对储集层的物理性质具有明显的影响作用。  相似文献   

水库移民中安置性移民与开发性移民的比较研究   总被引：6，自引：0，他引：6  

朱美荣 《地理科学进展》1999,18(3):201-207

建国以来, 中国水库移民安置经历了一个从安置性移民向开发性移民转变的过程。分析比较研究两类移民的本质差别, 有助于认识和掌握社会主义市场经济条件下开发性移民的基本规律性。遵循规律, 探讨问题, 促进开发性移民健康发展。  相似文献   

储集层构造裂缝定量预测方法研究   总被引：6，自引：0，他引：6       下载免费PDF全文

黄辅琼  宋惠珍  曾海容  肖承文  欧阳健 《地震地质》1999,21(3):261-267

选用裂缝体积密度作为构造裂缝定量化参数,对基于钻井岩心的裂缝体积密度的计算方法作了改进。统计分析得出,破裂试件裂缝体积密度与试件破裂应变能密度的关系受试件所受的围压变化及试件物性的控制,钻井岩心构造裂缝体积密度与数值模拟应变能密度的关系同试件研究结果有可比之处。在上述研究基础上,建立了利用钻井岩心裂缝参数和数值模拟应变能密度来定量预测碳酸盐岩储层构造裂缝体积密度的方法,并已应用于油田生  相似文献   

Correlation between rock fabrics and physical properties of carbonate reservoir rocks   总被引：5，自引：0，他引：5  

H. Dürrast  S. Siegesmund 《International Journal of Earth Sciences》1999,88(3):392-408

 Three carbonate core samples from an oil and gas reservoir of the NW German basin were chosen to study the correlation between rock fabrics and physical properties of reservoir rocks. Detailed fabric analyses and texture investigations were carried out as well as laboratory measurements of different physical properties, e.g. density, porosity, permeability, electrical conductivity, seismic compressional and shear wave velocities. Although the three core samples come from a similar depositional facies, they show great differences in the occurrence and three-dimensional distribution of the rock fabric elements. These heterogeneities are the result of various diagenetic and tectonic processes. For the correlation between the rock fabrics and the physical properties four main rock fabric types have to be considered: (a) major constituents, e.g. fossils, ooides, peloides and crystals; (b) pore space with different pore types; (c) fractures; and (d) stylolites. The results of the correlation clearly show that the values and anisotropies of the petrophysical properties are fairly related to the observed fabric elements, with their different arrangements, spatial distributions and preferred orientations. These results also provide a fundamental understanding of the petrophysical responses, such as seismics, to the different geological features (e.g. fractures) and their dynamic changes with pressure, which can be converted to different depths. The knowledge gained from such correlations may lead to an improved interpretation of geophysical data for hydrocarbon exploration and production and therefore to an advanced reservoir characterization. Received: 28 January 1999 / Accepted: 21 June 1999  相似文献   

A study of natural and artificially generated light hydrocarbons (C₄–C₁₃) in source rocks and petroleum fluids from offshore Mid-Norway and the southernmost Norwegian and Danish sectors     

W. Odden   《Marine and Petroleum Geology》1999,16(8):277

The “free” or “natural” light hydrocarbon composition obtained by thermal extraction-GC of source rock samples is compared with the light fraction generated by pyrolysis products of the kerogens. Even though there are large differences between the composition of the “free” C₄–C₁₃ hydrocarbon fraction and the same fraction generated by pyrolysis, some characteristics have been detected which can be used interchangeably for both data types. Visual inspection of gas chromatograms from thermal extracts and pyrolysates indicates that in particular the relative content of m+p xylene corresponds well between these two analytical methods. The source rock samples used are Upper Jurassic marine shales and Middle and Lower Jurassic coals and coaly shales from offshore Mid-Norway and Denmark. More detailed analysis of the data shows that the most effective parameter which can distinguish between different source rock types in both thermal extracts and pyrolysates is the m+p xylene/nC₈ ratio. This parameter has been used to derive classification diagrams for interpreting the source of light hydrocarbons of both natural petroleum fluids analysed by gas chromatography and the same fraction generated by pyrolysis of asphaltenes from the fluids.The model was first tested on 17 natural petroleum fluids from Mid-Norway since a comprehensive study of light hydrocarbon distributions already has been published. Further, the parameter was applied to correlate with asphaltene pyrolysates of the fluids from Mid-Norway and a total of 22 natural oils and condensates from the southernmost Norwegian and Danish sectors.  相似文献   

Evaluating sediment yield at King Talal Reservoir from landslides along Irbid–Amman Highway     

Mohanned S. Al-Sheriadeh  Abdallah I. Husein Malkawi  Ashraf Al-Hamdan  Nabil S. Abderahman 《Engineering Geology》2000,56(3-4):361-372

With a capacity of 86 MCM, King Talal Reservoir is considered a major water supply in Jordan. It was built exclusively to irrigate the land in the Jordan Valley. Unexpectedly, the design capacity of the reservoir was confronted by the elevated sediment inflows during and after the construction of the Irbid–Amman Highway in 1987. Since then the annual sediment inflow measured at the mouth of the reservoir was higher than expected in a similar year. Notably, the over-wet season of 1991/2, as a result of six major landslides along the highway, registered the highest sediment inflow into the reservoir. In the present work the fractional contribution of these landslides to total sediment yield at the reservoir was evaluated. The evaluation was made by applying the well-known erosion model, AGNPS (Young et al., USDA Conservation Research Report 35, 1987). To calibrate the model, it was successively applied from 1980/1 to 1990/1 on the measured sediment data before the occurrence of landslides. With a slight tune-up of some of the King Talal watershed erosion variables, fairly good agreement was obtained in some years. However, the disagreement noticed in other years might be attributed to some conservation measures practised in the watershed. Because the serious landslides occurred in the wet season of 1991/2, the model was run for the two scenarios in this year: with and without landslides. The difference in results represents the contribution of landslides to sediment yield at the reservoir. It is concluded, based on these results, that landslides, if continued without control, will definitely jeopardize the design capacity of the reservoir.  相似文献   

吴家庄水库库区岩溶渗漏分析     

李桂平  安民 《工程地质学报》2000,8(3):334-336

吴家庄水库位于山西省黎城县境内 ,拟建于由西南源和北源汇合而成的浊漳河干流上 ,总库容 3.6亿 m3,属大型水利工程。坝址区基岩为震旦系串岭沟组石英砂岩 ,向上游库区依次出露寒武、奥陶系碳酸盐岩 ,其分布面积占整个库区面积的一半以上 ,岩溶渗漏是库区最主要的工程地质问题 ,它直接影响到建库规模的确定和工程的可行性 ,本文就此进行了分析、评价 ,并对建库规模提出了建议.  相似文献