原油族组分成气的化学动力学模型及其标定   总被引：27，自引：2，他引：27       下载免费PDF全文

卢双舫  付晓泰 《地质学报》1997,71(4):367-373

利用等温密封热解实验技术及恒速升温热解实验与PY—GC分析技术的结合,本文分别建立并标定了原油中各族组分,即饱和烃、芳烃、非烃和沥青质成气的化学动力学模型。结果表明,原油中不同族组分成气的过程均可用平行一级反应描述,但不同组分在平均活化能及活化能分布上有明显的差异。各族组分在地史过程中成气的过程可由各自的化学动力学模型来描述。这将使原油成气过程的定量、动态描述成为可能。  相似文献   

块状岩体边坡地震滑动位移分析   总被引：13，自引：3，他引：13  

薛守义  王思敬 《工程地质学报》1997,5(2):131-136

岩体边坡在强震作用下往往会产生滑动残余位移。这种位移是边坡稳定性评价的重要参量。本文利用块体动力学原理推导出层状和块状岩体边坡地震滑动位移微分方程式, 并编制了相应的计算程序, 给出了实例的计算结果。  相似文献   

昆仑8.1级地震动力影响下青藏块体北部构造运动特征研究     

陈兵  张晓亮  张四新  薛富平  王继英 《国际地震动态》2004,(Z1):41

印度板块对欧亚大陆的强烈推挤作用是中国西部地震活动的根本力源.大尺度的构造动力作用应具有相对稳定性.从受力平衡的观点看,在基本恒定的边界载荷作用下,大陆内部应力场在不断地进行着自我调整,可以是缓慢的构造变形,也可能是强烈地震引起的短期变化.一条断裂上剧烈的突发运动必然破坏原有的平衡,从而引起其他相关构造应力应变的响应性改变和周边块体运动的适应性调整.这种状况有利于潜在震源区域应变能的累积和错动的发生.  相似文献   

冲绳海槽地区地壳结构与岩石层性质研究   总被引：9，自引：4，他引：9       下载免费PDF全文

郝天珧  刘建华  郭锋  黄忠贤  胥颐  戴明刚  李安春  付永涛 《地球物理学报》2004,47(3):462-468

用冲绳海槽地区地质、地球物理、地球化学数据与资料，对横跨大陆边缘—大洋板块的中国东部—冲绳海槽—琉球岛弧地区进行综合研究. 根据地震体波、面波成像结果，空间与布格重力异常及磁力异常的综合解释等结果，利用调和系数法对该研究区的地壳厚度进行了计算，并对地壳属性进行分析. 同时，选择中国东部东北地区的宽甸、华北地区的汉诺坝、华南的闵溪和台湾海峡的澎湖列岛与冲绳海槽和日本岛弧的新生代玄武岩开展元素—同位素对比研究. 结果认为冲绳海槽岩石层明显减薄，上地幔低速层已达到莫霍面，在地幔中已形成交代软流层. 元素—同位素研究表明：它不同于中国东部，与琉球岛弧地区的特点也不相同. 综合分析认为：冲绳海槽地壳属于过渡型地壳，与大洋地壳的许多特点颇为相似.  相似文献   

四川内江松柏寨旅游资源特征及开发浅论     

张隐秋  张先勇 《四川地质学报》2004,24(3):165-172

详细介绍了内江松柏寨的七山、七堰、八景等自然景观；对以般若寺为代表的寺庙、寨门以及历代名人所留下的行踪和墨迹作了生动描写；提出以生态旅游为理念进行统一规划，并采取保护性开发的若干建议。  相似文献   

第二松花江流域水电厂综合中长期水文预报的分析研究     

范垂仁谢武贤  关志成冷雪 范思毅 《水文》2004,24(2):31-34,54

基于对第二松花江流域上游小山、松山、两江水电站中长期水文预报研究成果，论述了综合中长期水文预报的研究思路和定性预报、定量预报的分析研究方法。该研究通过2002年实践检验，具有较高的预报精度。  相似文献   

许昌麦岭水源地可开采量的水均衡法计算   总被引：1，自引：0，他引：1  

张先  周亮 《水文地质工程地质》2004,31(2):83-87

根据许昌麦岭镇多年地下水动态观测资料,利用水均衡法原理,对水源地边界地质条件、补给与排泄的关系进行研究,对地下水允许开采量进行综合评价,提出水源地水量开采的建议。  相似文献   

Dissolution mechanisms of water in depolymerized silicate melts: Constraints from H and Si NMR spectroscopy and ab initio calculations     

Xianyu Xue  Masami Kanzaki 《Geochimica et cosmochimica acta》2004,68(24):5027-5057

Dissolution of water in magmas significantly affects phase relations and physical properties. To shed new light on the this issue, we have applied ¹H and ²⁹Si nuclear magnetic resonance (NMR) spectroscopic techniques to hydrous silicate glasses (quenched melts) in the CaO-MgO-SiO₂ (CMS), Na₂O-SiO₂, Na₂O-CaO-SiO₂ and Li₂O-SiO₂ systems. We have also carried out ab initio molecular orbital calculations on representative clusters to gain insight into the experimental results.The most prominent result is the identification of a major peak at ∼1.1 to 1.7 ppm in the ¹H MAS NMR spectra for all the hydrous CMS glasses. On the basis of experimental NMR data for crystalline phases and ab initio calculation results, this peak can be unambiguously attributed to (Ca,Mg)OH groups. Such OH groups, like free oxygens, are only linked to metal cations, but not part of the silicate network, and are thus referred to as free hydroxyls in the paper. This represents the first direct evidence for a substantial proportion (∼13∼29%) of the dissolved water as free hydroxyl groups in quenched hydrous silicate melts. We have found that free hydroxyls are favored by (1) more depolymerized melts and (2) network-modifying cations of higher field strength (Z/R²: Z: charge, R: cation-oxygen bond length) in the order Mg > Ca > Na. Their formation is expected to cause an increase in the melt polymerization, contrary to the effect of SiOH formation. The ²⁹Si MAS NMR results are consistent with such an interpretation. This water dissolution mechanism could be particularly important for ultramafic and mafic magmas.The ¹H MAS NMR spectra for glasses of all the studied compositions contain peaks in the 4 to 17 ppm region, attributable to SiOH of a range of strength of hydrogen bonding and molecular H₂O. The relative population of SiOH with strong hydrogen bonding grows with decreasing field strength of the network-modifying cations. Ab initio calculations confirmed that this trend largely reflects hydrogen bonding with nonbridging oxygens.  相似文献   

Tracing the protolith, UHP metamorphism, and exhumation ages of orthogneiss from the SW Sulu terrane (eastern China): SHRIMP U–Pb dating of mineral inclusion-bearing zircons     

Fulai Liu  Zhiqin Xu  Huaimin Xue 《Lithos》2004,78(4):411-429

Orthogneisses are the major country rocks hosting eclogites in the Sulu UHP terrane, eastern China. All of the analyzed orthogneiss cores from the main drilling hole of the Chinese Continental Scientific Drilling Project (CCSD-MH) have similar major and trace element compositions and a granite protolith. These rocks have relatively high LREE/HREE ratios, strong negative Eu anomalies (Eu/Eu*=0.20–0.39), and negative Ba anomalies (Ba/Ba*=0.25–0.64). Coesite and coesite-bearing UHP mineral assemblages are common inclusions in zircons separated from orthogneiss, paragneiss, amphibolite, and (retrograded) eclogite of the CCSD-MH. This suggests that the eclogite, together with its country rocks, experienced in situ ultrahigh-pressure (UHP) metamorphism. Laser Raman spectroscopy and cathodoluminescence (CL) images show that zircons from the orthogneisses are zoned and that they have distinct mineral inclusions in the different zones. Most zircons retain early magmatic cores with abundant low-pressure mineral inclusions, which are mantled with metamorphic zircon-containing inclusions of coesite and other UHP minerals. The outermost rims on these grains contain low-pressure mineral inclusions, such as quartz and albite. SHRIMP U–Pb dating of the zoned zircons gives three discrete and meaningful groups of ages: Proterozoic ages for the protolith, 227±2 Ma for the coesite-bearing mantles, and 209±3 Ma for the amphibolite facies retrograde rims. The widespread occurrence of UHP mineral inclusions in zircons from the Sulu metamorphic belt dated at about 227 Ma suggests that voluminous continental crust experienced late Triassic subduction to depths of at least 120 km and perhaps more than 200 km. Eighteen million years later, the terrane was rapidly exhumed to midcrustal levels, and the UHP rocks were overprinted by amphibolite facies metamorphism. The exhumation rate deduced from the zircon age data and previously obtained metamorphic P–T data is estimated to be 5.6–11.0 km/Ma. Such rapid exhumation of the Sulu UHP terrane may be due to the buoyancy forces produced by subduction of low-density continental material into the deep mantle.  相似文献   

金坛市开发区的数字影像测图     

王立兴  薛炜  王训霞 《现代测绘》2004,27(3):41-42

为完善数字化测图功能，通过全数字摄影测量系统(VirtuoZo)的数字影像测图模块(IGS)在金坛市开发区1：500测区中的应用，总结提高测图精度和速度的体会。  相似文献