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71.
封闭体系有机质与有机碳氢氮恢复动力学研究 总被引:3,自引:0,他引:3
在封闭体系的条件下,对典型的Ⅰ、Ⅱ、Ⅲ型干酪根在热演化过程中的损失进行生烃动力学研究,获得了Ⅰ、Ⅱ、Ⅲ型干酪根的总量、有机碳、氢以及氮质量损失动力学参数。用Kinetics软件计算了封闭体系干酪根有机碳丰度、氢碳原子比和氮碳原子比的恢复系数。认为在对高成熟—过成熟干酪根进行生烃评价时,Ⅰ、Ⅲ型干酪根残余有机碳丰度需要进行恢复,而Ⅱ型干酪根残余有机碳丰度不需要恢复。三种类型干酪根的氢碳原子比均需要进行恢复。 相似文献
72.
金岭寺—羊山盆地北票组烃源岩特征 总被引:2,自引:0,他引:2
通过对采集的岩样进行地球化学综合分析,得出金羊盆地北票组为盆地主要烃源岩,为盆地油气生成提供了物质基础;北票组烃源岩有机质丰度不高,属差一中等烃源岩;干酪根类型以腐殖型为主,成烃母质为陆地高等植物:金羊盆地北票组烃源岩已经进入成烃门限.并处于成熟阶段中的低成熟到中成熟阶段。 相似文献
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76.
西安南郊丰水年秋季土壤水分研究 总被引:4,自引:0,他引:4
通过对西安南郊丰水年秋季土壤含水量的测定,研究了地下0~6 m之间土壤含水量的变化与土壤干层的恢复问题。研究结果表明,丰水年西安南郊人工林下2~3 m的土壤含水量在20%左右,远远高于正常年份的土壤含水量,而且大于表层和深层的土壤含水量。分析得出,土壤干层发育较弱的地区在降水丰富的年份可以得到一定程度的恢复;西安地区基本适合进行人工造林;通过人工措施,增强降水入渗和土壤含水量,对树木成活和长期的生长应当具有明显的作用。 相似文献
77.
土壤颜色——一个可靠的气候变化代用指标 总被引:3,自引:0,他引:3
将研究剖面自上而下以2cm间隔采取的样品,烘干并研磨至小于45μm,此时,土壤的颜色将不再发生变化。将处理好的样品分别测土壤颜色指标亮度、红度和黄度,将测得的亮度、红度和黄度指标分MIS4、MIS3、MIS2和MIS14个阶段,通过与研究剖面的气候指标磁化率、粒度和CaCO_3在百年尺度、千年尺度上的对比分析,以及在万年尺度上与高纬格陵兰GRIP冰芯记录和反映全球冰量变化的SPECMAP曲线进行对比分析表明:土壤颜色指标作为气候变化的代用指标无论在百年尺度、千年尺度还是在万年尺度上均是可靠的,这种可靠性在末次冰期阶段表现得更为显著,这一结论是否适用于整个第四纪冰期间冰期旋回,尚需更多黄土剖面的研究事实来加以证明。 相似文献
78.
Shuyun XIE Zhengyu BAO Bing LI 《中国地球化学学报》2006,25(B08):7-8
Three kinds of spatial analysis methods (geostatistics, concentration-area fractal model and the multifractal analysis called the moment method) were used for almost 50 elements, including heavy metals, disperse elements, rare elements and even others, in 6586 top soil (0-20 cm) samples and 1833 deep soil (150-200 cm) samples from Chengdu metropolitan area of 12400 km^2, southwestern China. The ranges of spatial correlation revealed by variograms are quite different for different kinds of elements in the top and deep soils. The most interest is the fact that the multifractal spectra of environmentally important elements such as Pb, Cr, Cd and Ni in top soils in the metropolitan area show systematic change from those in the deep soils, revealing a strong anthropogenic addition, while Hg, Zn, As, Cu and all common elements show no such kind of addition. In terms of multifractal properties based on the multifractal spectrum curves, those disperse and rare elements show great deviation from other major and trace elements, which is also of great interest. 相似文献
79.
Limin REN Bing QIN Wenchun TANG Zhendong MA Yikeng HU 《中国地球化学学报》2006,25(B08):10-10
Mercury is a pollutant of concern due to its toxic and bioaccumulative properties. Studies on the distribution and hazard of mercury in the environment are mainly focused on its forms, toxicity and the environment standard, and progresses and results have been achieved. But these studies in the past were concentrated on the scales of laboratory or smaller districts merely, such as a small unit of mineral area, vegetable base, paddy field, lake, etc. Multi-target regional geochemical survey carried out by China Geological Survey from the 1990s to now is a fundamental and commonweal geological survey, large-scale and systematical inquisition and research were conducted in 19 provinces (or municipalities directly under the Central Government) in the eastern overlay region of China, and the purpose is to provide the basic geochemical data for national economic construction, adjustment of industrial and agricultural structures and sustainable social development. Geochemical studies aim at investigating soils in these regions and 52 elements have been tested, producing a great amount of data at the same time. Methods: based on the data from 3061 samples of surface soil and 832 samples of deep soil from the project of multi-purpose geochemical survey in the Chengdu Basin, Sichuan, China, this paper describes the correlation relationship between Hg and other 48 elements and their spatial distribution in surface and deep soils of these areas by applying the method of linear regression and factor analysis. 相似文献
80.
Wei JIANG Xinqing LEE 《中国地球化学学报》2006,25(B08):12-12
Nitrogen cycle is an important bio-geochemical process in the environment. Measurement of the total nitrogen (TN) is a routine experiment in agriculture, biology and environmental sciences. The Kjeldahl method (KM) and elemental analyzer method (EA) are both commonly used to determine TN. Total nitrogen by EA is the sum of nitrate (NO3), nitrite (NO2), organic nitrogen and ammonia. Total nitrogen by KM (TKN) is made up of both organic nitrogen and ammonia. A comparative study focused on the two methods is conducted by analysis of TN in 97 samples from the sediment sequence of Gouchi, a salt lake in North China. KM presents a higher degree of accuracy than EA with a standard deviation of 0.007 vs. 0.024. With the presence of nitrate and/or nitrite nitrogen, however, measurement by KM is considerably lower than that by EA. Therefore, for samples from lake sediment sequences or soils in North China, KM is inapplicable to determining TN because of usually high contents of nitrous salt. Despite the inconsistency, use of both methods to the same samples makes sense in reconstructions of climatic and environmental changes from lake sediments. In Lake Gouchi, the contents of nitrate and nitrite nitrogen vary from 1.40% in the lower part of the sequence to 14.77% in the uppermost part, suggesting a gradual evolution process from a fresh water lake to the present-day salt lake. 相似文献