东濮凹陷桥口构造沙三段储层成岩作用与孔隙演化     

蒋庆平  李德敏  罗洋  王刚 《新疆地质》2008,26(4)

通过薄片观察、鉴定可知,桥口地区沙河街三段储集层砂岩成岩作用主要有压实作用、胶结作用、交代作用和溶蚀作用．孔隙以粒间溶孔、粒内溶孔和胶结物溶孔等次生溶孔为主．经粘土矿物X衍射分析,将成岩阶段划分为早成岩A、B期和晚成岩A1、A2、B期,早成岩A、B期的机械压实和胶结作用使原生孔隙大量丧失,晚成岩A1溶蚀作用对储层孔隙起重要改善作用,增加大量次生孔隙,晚成岩A2、B期方解石胶结物的胶结作用使砂岩次生孔隙大量减少．因此早期原牛孔隙的大量散失、晚期胶结作用使次生孔隙大量减少是造成本区砂岩低孔、低渗的主要原因．  相似文献   

The distribution and geological significance of carbazole compounds in Silurian paleo-pools of the Tarim Basin,Northwest China     

LIU Luofu HUO Hong GUO Yongqiang CHEN Lixin LI Shuangwen ZHAO Yande LI Yan WANG Ping CHEN Zhijun 《中国地球化学学报》2008,27(1):1-8

The results presented in this paper indicated that the carbazole-type compounds have high thermal stability and also show stability in oxidation and bio-degradation. This kind of compounds still has high concentrations and a complete distribution in the analyzed dry asphalt samples, showing that they are particularly useful in the study of hydrocarbon migration of the paleo-pools. The difference in the contents of nitrogen compounds in the Silurian dry asphalts from the Awati, Tabei and Tazhong areas is attributed to the difference in the extent of oxidation and （or） bio-degradation for the areas; the Awati and Tabei areas underwent relatively strong oxidation and bio-degradation. During the first stage of hydrocarbon pool formation in the Silurian system in the Tazhong and Tabei areas of the Tarim Basin （at the end of the Silurian period） and at the second stage in the Awati area （in Permian）, the hydrocarbons experienced a long-distance migration.  相似文献   

Geochemistry and environmental effect of cadmium in the super-large Jinding Pb-Zn deposit,Yunnan Province,China     

Hang Li  Dahua Li  Tangfu Xiao  Libin He  Zengping Ning  Jialong Sun  Changsheng Zhu  Yan Shuang 《中国地球化学学报》2008,27(1):21-27

The Jinding Pb-Zn deposit in Yunnan Province is the representative of a Cd-enriched area and mining activities lead to the release of Cd into the hypergenic ecosystem, resulting in Cd pollution. The concentrations of Cd vary greatly from one type to another type of rocks in the mining district. In the host rock, Cd concentrations range from 50×10^-6 to 650×10^-6 with an average of 310×10^-6. In primary ores, Cd concentrations range from 14×10^-6 to 2800×10^-6 with an average of 767×10^-6. However, in oxidized ores, Cd concentrations are highest, varying within the range of 110×10^-6 to 8200×10^-6 , averaging 1661×10^-6. It is shown that the oxidized ores are the main carder and environmental source of Cd. Leaching test showed that Pb/Zn ores are easy to oxidize and thereafter release Cd and other harmful elements. These leached elements in the leachate may be precipitated rapidly in the order of Zn〉Pb〉Cd. As for the concentration distribution of Cd in the Bijiang River, it is estimated to be 15.7 μg/L Cd in water, 49.3 mg/L in suspended substances, and 203.7 mg/L in sediments. The average value of Cd in soil from the polluted area is 83.0 mg/kg. Natural weathering of Cd-rich rocks and minerals imposes a potential environmental risk on the aquatic ecosystem of the Bijiang catchment.  相似文献   

Petroleum Migration Direction of the Silurian Paleo-pools in the Tarim Basin, Northwest China   总被引：1，自引：0，他引：1  

LIU Luofu  ZHAO Ye  HUO Hong  CHEN Lixin  CHEN Yuanzhuang  ZHAO Suping  LI Chao  LI Shuangwen  GUO Yongqiang  LI Yan 《《地质学报》英文版》2008,82(1):174-183

The results obtained in this paper indicate that carbazole-type compounds have high thermal stability and also show stability in oxidation and bio-degradation. This kind of compounds still has a high concentration and complete distribution in the analyzed dry asphalt samples, showing that they are particularly useful in studying petroleum migration of paleo-pool. During the basin＇s first-stage of oil-gas pool formation in the Silurian in Tazhong and Tabei areas of Tarim Basin （at the end of Silurian period） and the second-stage in the Awati area （in Permian）, the petroleum experienced a long-distance migration. During the formation of the Silurian paleo-pools in Tazhong Uplift at the end of Silurian, the petroleum mainly came from the lower and middle Cambrian source rocks in the Manjiaer sag. The petroleum migrated towards the southwest-south entering the Silurian reservoir beds in Tazhong first. Then, it further migrated within Silurian from northwest to southeast along the highs of the Structural Belts to the region of the Silurian pinchout boundary in Tazhong. In Tabei Uplift, during the first-stage of pool formation, the petroleum was also from the lower and middle Cambrian source rocks in the Manjiaer sag. It migrated northwest entering the Silurian reservoir beds in the Tabei Uplift firstly, and then the migration continued in the same direction within the Silurian reservoirs and finally the petroleum was trapped in higher positions. During the second-stage pool formation in the Silurian beds in the areas around Awati sag, the petroleum mainly came from the lower-middle Cambrian source rocks in the Awati sag. The petroleum migrated from the generation center to Silurian reservoirs in all directions around the sag through major paths, and the petroleum was finally trapped in higher locations.  相似文献   

Origin of Oils in “Subtle pools” in the Dongying Depression, Bohai Bay Basin, China     

Li Sumei  Jiang Zhengxue  Liu Keyu  Qiu Guiqiang  Gao Yongjin 《《地质学报》英文版》2008,82(1):184-196

Subtle traps or oil pools have become an important exploration play in the Dongying Depression, Bohai Bay Basin, east China. Despite recent successes in exploration, the formation mechanisms of subtle traps are still not well understood. The majority of subtle oil pools in the Dongying Depression are developed in the middle interval of the Es3 Member of the Paleogene Shahejie Formation with the subtle traps being primarily of lenticular basin-floor turbidite sands encompassed in mudstones. Oil in the subtle traps was previously thought to have migrated directly from the surrounding source rocks of the same formation （Es3）. Detailed geochemical investigation of 41 oils and 41 rock samples from the depression now indicates that the oils from the subtle traps cannot be correlated well with the surrounding Es3 source rocks, which are characterized by high Pr/ Ph （〉1）, low Gammacerane/C30hopane, representing a freshwater lacustrine setting. In contrast the oils features low Pr/Ph （〈1） and relatively high Gammacerane content, showing a genetic affinity with the underlying Es4 source rocks, which also have the same qualities, indicating a brackish lacustrine setting. Oils in the Es3 subtle traps are probably derived from mixed sources with the contribution from the upper Es4 source rocks predominating. Therefore unconventional oil migration and accumulation mechanisms need to be invoked to explain the pooling of oils from the ES4 source rocks, which probably came through a thick low interval of the Es3 source rocks with no apparent structural or stratigraphic pathways. We suggest that the subtle oil migration pathway probably plays an important role here. This finding may have significant implications for future exploration and the remaining resource evaluation in the Dongying Depression.  相似文献   

Distribution Characteristics of Sulfur and the Main Harmful Trace Elements in China’s Coal     

TANG Shuheng  SUN Shenglin  QIN Yong  JIANG Yaof  WANG Wenfeng 《《地质学报》英文版》2008,82(3):722-730

To promote the rational development and use of clean coal resources in China, data on the regional and age distribution of sulfur, arsenic and other harmful elements in Chinese coal was broadly collected, tested for content, and analyzed. Coal in northwestern China is characterized by low to extremely low levels of sulfur; the coal of the Taiyuan Formation in northern China mainly has high-sulfur content; that of the Shanxi Formation is mainly characterized by low sulfur coal; and the Late Permian coal in southern China has overall higher sulfur content; other regions have low sulfur coal. The average content of harmful trace elements in the bulk of China＇s coal is similar to the corresponding content in the coal of the North America and the rest of the world, whereas the content of various elements （Hg, Sb and Se） is different in magnitude to the corresponding percentage in the crust. The average content of the elements Cr, Se, Co, Be, U, Br in Late Permian coal in S China ranks first in the country whereas the average content of Hg and CI in the coals of Late Carboniferous to Early Permian age in N China are the highest. The average content of Mn in Early and Middle Jurassic coal is higher in NW China. The high content of harmful elements in some coal should cause particular concern both in the development and utilization of coal.  相似文献   

多源遥感数据综合解译鄂尔多斯盆地杭锦旗地区地质构造   总被引：1，自引：0，他引：1  

颜蕊  张景发  姜文亮  焦孟梅 《国土资源遥感》2008,(2):88-92

利用多源遥感数据假彩色合成、融合及纹理分析等增强处理方法提取研究区构造信息,进而对研究区进行综合解译;通过分析水系、色调、纹理、地貌及岩性等特征,判断出杭锦旗地区存在一小一大、内外相套的2个环形构造,发育的北西向、北东向2组共轭断层和一组北北西向断层,与环形构造相互构架,构成研究区特殊的构造体系。经分析预测,这些构造是受周边南北向构造应力共同挤压而形成。  相似文献   

GPS应用于高空施工机械安全监控     

陈豪  朱大明  杨金玲  杨明龙  刘妍  司海燕 《测绘工程》2008,17(2):43-47

结合小湾水电站建设施工情况,利用实地采集的GPS定位数据,探讨使用GPS实时动态定位技术构建高空施工机械安全监控系统的实现原理和可行性,同时介绍构成系统的各个模块及其功能,给出有效地实施高空施工机械安全运行监控的实用方法。  相似文献   

基于非充分掺混模式的流域来水组成模型          下载免费PDF全文

王船海  朱琰  程文辉  向小华 《水科学进展》2008,19(1):94-98

针对如何减小数值求解对流输运方程耗散误差的问题,引进断面计算浓度的概念来计算河段平均浓度,提出了非充分掺混模式的有限控制体积法离散对流输运方程的新算法,据此构建了模拟流域内的水源组成以及不同水源在流域内的时空变化情况的流域来水组成模型。通过数值试验与具体实例验证,结果表明所提出的非充分掺混模式的新算法可有效地提高流域来水模型的计算精度。  相似文献   

土钉抗拔承载力的原位试验研究   总被引：1，自引：0，他引：1       下载免费PDF全文

陆益成  薛艳 《江苏地质》2008,32(2):133-136

根据土钉现场抗拔试验数据,分析了钉材、浆液龄期等因素对土钉抗拔承载力的影响,建议了合理的下层土钉开挖时间。最后通过试验土钉抗拔力反算土体与锚固体的极限粘结强度,并与规范推荐值进行了比较。  相似文献