用典型曲线计算煤层气资源量     

韩保山  张新民 《煤田地质与勘探》2004,32(Z1):42-45

参考先进能源公司(ARI)2002年关于粉河盆地煤层气资源评价的研究报告,结合煤层气地质学和煤层气开发理论,提出了一种计算煤层气可采资源量的方法,即使用煤层气典型生产井的产量预测曲线,通过"极限产量"截尾"的方法,计算一评价单元的煤层气可采资源量.并给出了该方法的使用步骤、优点及局限性.  相似文献   

Effect of iron type on kinetics and carbon isotopic enrichment of chlorinated ethylenes during abiotic reduction on Fe(0)     

VanStone NA  Focht RM  Mabury SA  Lollar BS 《Ground water》2004,42(2):268-276

Four samples of two commercially available iron brands used as substrate for iron permeable reactive barriers (PRBs) were tested for suitability for remediation of perchloroethylene (PCE), trichloroethylene (TCE), cis-dichloroethylene (cDCE) and vinyl chloride (VC). Kinetic studies indicate that rates of reaction are enhanced for cDCE and VC on Connelly iron (2.8 x 10(-4) to 6.9 x 10(-4) L/m2/hr and 2.0 x 10(-4) to 9.0 x 10(-4) L/m2/hr, for cDCE and VC, respectively) vs. Peerless iron (3.1 x 10(-5) to 4.6 x 10(-5) L/m2/hr and 2.4 x 10(-5) to 4.1 x 10(-5) L/m2/hr, for cDCE and VC, respectively). Carbon isotopic analyses of the residual chlorinated ethylene (CE) during degradation indicate significant fractionation occurs during reductive dechlorination, with, for example, up to 70% enrichment in carbon isotopic values observed when VC is more than 99% degraded. Comparison of fractionation factors (epsilon) indicates significant differences in carbon isotopic fractionation for different iron types and for different CEs. For the lower CEs (cDCE and VC) in particular, both slower reaction rates and larger fractionation are observed for degradation on Peerless vs. Connelly iron. This is the first study to establish a correlation between the rate of abiotic degradation on Fe(0) and the extent of isotopic fractionation, and the first to confirm consistent differences in these two parameters as a function of iron type. The possibility that these differences in kinetics and carbon isotopic fractionation for cDCE and VC are related to differences in branching ratios between competing hydrogenolysis and beta-elimination reactions during reductive dechlorination on the iron surfaces is discussed.  相似文献   

Ecological condition of US Mid-Atlantic estuaries, 1997-1998     

Kiddon JA  Paul JF  Buffum HW  Strobel CS  Hale SS  Cobb D  Brown BS 《Marine pollution bulletin》2003,46(10):1224-1244

The Mid-Atlantic Integrated Assessment (MAIA-Estuaries) evaluated ecological conditions in US Mid-Atlantic estuaries during the summers of 1997 and 1998. Over 800 probability-based stations were monitored in four main estuarine systems--Chesapeake Bay, the Delaware Estuary, Maryland and Virginian coastal bays, and the Albemarle-Pamlico Estuarine System. Twelve smaller estuaries within the four main systems were also assessed to establish variance at the local scale. A subset of the MAIA-Estuaries data is used here to estimate the extent of eutrophication, sediment contamination, and benthic degradation in mid-Atlantic estuaries. An Environmental Report Card and Index of Environmental Integrity summarize conditions in individual estuaries, the four estuarine systems, and the entire MAIA region. Roughly 20-50% of the region showed signs of eutrophication (high nutrients, excessive production of organic matter, poor water clarity, or depleted dissolved oxygen), 30% had contaminated sediments, and 37% had degraded benthic communities. Compared with the Environmental Monitoring and Assessment Program (EMAP)-Virginian Province study in 1990-1993, larger fractions of Chesapeake Bay (17%) and Delaware River (32%) had increased metals or organics in sediments.  相似文献   

On some faulty concepts in Soviet urban studies     

Agafonov NT  Lavrov SB  Khorev BS 《Soviet geography》1983,24(3):179-188

"The authors attack what they call 'superurbanism' and 'agglocentrism,' an excessive preoccupation among some Soviet geographers with urbanization and the formation of urban agglomerations. The authors advocate what is known in Soviet geography as a 'unified system of settlement,' meaning a harmonious blend of both urban and rural forms. The 'agglocentrists' are said to derive their ideas from Western models, and the authors [note the growing] disenchantment with excessive urbanism in the West."  相似文献   

蒙特卡洛法在煤层甲烷资源量计算中的应用     

张新民  张遂安 《煤田地质与勘探》1990,18(5):24-28

介绍了蒙特卡洛法,并以实例说明用此法计算煤层甲烷资源量的全过程以及计算程机序处理的实现过程及其要点。   相似文献   

基于GIS的西峰区沟道雨洪资源可利用量研究   总被引：1，自引：0，他引：1  

高雅玉  张新民  田晋华  于惠 《水文》2017,37(1):72-78

利用庆阳市西峰区的DEM、Quickbird影像资料对西峰区沟道特征进行沟道特征分析,并分析了沟道不同降水频率下雨洪特征。以司家沟为典型沟道,采取典型年法和单次暴雨分析法将不同降水频率典型年中大于20mm的单次降水与基准暴雨量相对应,计算出典型年的雨洪总量(可收集利用量)和单次降水的洪峰流量,并进一步分析了不同降水保证率的各区域雨洪资源量。结果表明,西峰区各沟道雨洪资源量的总体趋势为高保证率雨洪资源量少、低保证率雨洪资源量大,但是由于洪水频率跟降雨频率不同步,在干旱年降水频率低时,洪水频率有可能较大,因此干旱年份对雨洪资源的利用尤为重要。  相似文献   

印度南部过度开发灌溉系统模型的建立     

Than.  BS 贡小虎 《世界沙漠研究》1993,(4):35-40

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全面勘定行政区域界线—谈勘界测绘技术工作     

张新民 《测绘科技通讯》1997,20(4):52-54

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西峰区雨水集蓄利用可行性研究     

郭龙  张新民  刘久如 《地下水》2015,(4)

雨水集蓄利用是缓解城市水资源压力的一条经济、快捷、有效的途径。通过对西峰区下垫面类型和降雨条件综合分析,在降水保证率为75%时,该区不透水集雨面可收集雨水量为2 964.96万m3,其中李岭村雨水可收集量为14.328万m3,对李岭村雨水可收集量进行经济效益分析可知,每年大约可为该村用水费用节约25万元,并结合西峰区自身特点,提出雨水综合利用的基本途径和措施,这对解决西峰区资源性缺水问题、减少洪涝灾害、改善生态环境、实现节水型社会的建设和水资源的可持续利用具有一定的指导意义。  相似文献   

若尔盖铀矿床中硅质灰岩岩石学及地球化学     

王永飞  李宝新  陈田华  张新民  董之凯 《四川地质学报》2018,(2)

若尔盖地区志留系内产出的众多铀矿床中含有层状、似层状、透镜状硅质灰岩,对其成因的研究有助于查明矿床成因和确定区域找矿方向。研究表明,硅质灰岩化学成分不稳定,以碱性CaO或酸性SiO_2为主。据硅质灰岩中蚀变矿物的微量元素地球化学特征,认为其流体主要来源于深部。从硅质灰岩的稀土配分看出,Ce/Ce*和Eu/Eu*值适中,硅质灰岩是海底喷流沉积的产物。硅质灰岩的δ~(13)C值偏高,具海洋沉积碳酸盐岩的碳同位素组成特征。在铀矿床中δ~(18)O值较高,表现为地幔来源的特点。U的矿化程度与Al_2O_3-MnO-Fe_2O_3含量呈正相关,与P_2O_5呈负相关,与SiO_2-CaO-K_2O-TiO_2-Na_2O-MgO组合呈显著负相关。  相似文献