STUDY ON FLUXES OF CH4 EMISSION FROM PADDY FIELDS IN CHANGCHUN AREA

CH4 is a kind of important greenhouse gases in atmosphere. The current atmospheric concentration of CH4 is about 1.7ppmv and is increasing at almost 2％ per year. The sources of CH4 include paddies, wetland and tundra, insects, the digestive tracts of ruminants, coal mining, biomass burning, and the leakage of natural gas. The total input to the atmosphere lies in the range 300－ 550Tg per year. CH4 from paddy fields is about 10％ － 20％ of total source of atmospheric CH4 (DING, 1997). …     

辽宁营口东部白硼矿床特征及找矿方向

辽宁省营口东部是我国白硼矿床重要产区之一。白硼矿床赋存在早元古宙辽东裂谷带内。辽河群里尔峪岩组,黑云变粒岩、电气变粒岩夹含硼镁橄岩为含硼岩系。东西向、北西向断裂带为储矿构造,辽河期复式深成黑云母二长花岗岩为其成矿母岩 (热源体 )。蛇纹石化大理岩、蛇纹石化镁橄岩是重要的含硼蚀变岩带及找矿标志。     

<数字电路>CAI课件的研制与开发

《数字电路》CAI课件是利用VisualBaisc 4 0软件工具进行开发的 ,在讨论了该课件的总体设计方案的同时 ,还阐述了课件界面设计应注意的问题 ,以及实现图像配合语音播放方法     

CH4-H2O体系流体包裹体拉曼光谱定量分析和计算方法

CH4—H2O体系流体包裹体研究对含油气盆地流体分析和成矿流体研究都有重要的意义。本文详细介绍了H2O、CH4和CH4—H2O体系的拉曼光谱特征及分子作用,分析了CH4—H2O体系热力学特征,同时对CH4—H2O体系流体包裹体拉曼光谱定量分析和计算的方法及步骤进行了叙述。利用人工合成流体包裹体建立甲烷浓度与拉曼特征峰面积比值之间的校正曲线是实现CH4—H2O体系流体包裹体定量分析的基础。盐度对包裹体定量分析的影响最为显著,在恒定甲烷浓度下,甲烷与水的拉曼峰面积比值随着盐度增加而减少。对于流体包裹体封闭体系,随温度升高,液相甲烷浓度增大。校正曲线必须包含对温度和盐度的校正。石英主矿物性质和方位对甲烷浓度定量分析的影响可以忽略。实验研究表明,原位拉曼光谱技术是准确获取流体包裹体中甲烷水合物生成条件的一种有效方法。因此,基于拉曼光谱分析和显微测温分析结果,采用热力学模型可以定量计算CH4—H2O体系流体包裹体的相关参数。     

基于IPCC预测结果的北太平洋海表面温度变化分析

利用IPCC-AR4气候模式诊断与比较计划(PCMDI)20C3M试验和A1B情景试验模拟数据,研究了在温室气体排放情景下,北太平洋海表面温度的变化及其对太平洋风应力旋度变化的响应。结果表明,温室气体中等排放A1B情景与20C3M情景相比,北太平洋年平均海表面温度表现为一致增温的趋势,且最大的增温中心位于黑潮及其延伸体区。与20C3M试验相比,CO2增加情景下北太平洋中部东风加强,增加向北的Ekman输送,使得北太平洋内区增温。风应力旋度零线也向北略有移动,导致黑潮延伸体向北移动并得到加强,从而引起延伸体区较强增温。风应力旋度零线的纬度附近产生的Rossby波,向西传播到黑潮延伸体区,进一步加强黑潮延伸体区的温度异常。海洋对北太平洋风应力场变化的局地响应及延迟响应,使黑潮延伸体海域海表面增温远大于周围海区。     

ZnSO4、CuSO4和KMnO4对南京丰年虫的毒性研究

研究ZnSO4、CuSO4、KMnO4对南京丰年虫96小时的急性毒性,结果表明ZnSO4、CuSO4 浓度越高,南京丰年虫暴露其中时间越长,死亡率越高.ZnSO4、CuSO4 对南京丰年虫24h、48h、72h和96h 的LC50分别为1.55×10-6、1.40×10-6、1.28×10-6、0.55×10-6和0.49×10-6、0.46×10-6、0.41×10-6、0.05×10-6,安全浓度为0.05×10-6和0.005×10-6;KMnO4在6.4×10-6以上使南京丰年虫在1～2h内全部死亡,而在6.4×10-6以下毒性不甚明显.     

煤矿采空区四维地震特征分析及识别方法:以淮南煤田张集矿区为例

煤矿采空区塌陷是一个重要的地质问题,由于采空塌陷区地震、地质条件的复杂性,传统三维地震勘探探测方法难以准确查明采空区边界.本研究提出一种基于四维地震特征的煤矿采空区识别方法,并以淮南煤田张集煤矿为靶区开展采空区探测.该方法从模型驱动入手,通过建立煤层开采前、后地质模型及进行正演模拟,利用模型地震叠前时间偏移剖面回溯分析...     

蒙皂石转化伊利石的数值模拟——溶解沉淀模型与化学动力学模型

提出了改进的溶解沉淀数学模型，在塔里木盆地塔中4井应用获得成功。该井石炭系的实例表明:该模型在粘土矿物内的模拟结果，与K Ar定年分析吻合，并接近于粘土矿物分析数据。实例指出:在较早提出的化学动力学模型、新近提出的溶解沉淀模型中，最敏感的参数都是活化能；将粘土矿物分析数据作为约束条件来校准活化能，是获得正确的蒙皂石史和伊利石史之关键。采用最佳活化能计算，可获得最佳模拟结果:①算出的伊利石开始生长的年代与K Ar定年分析吻合；②模拟结果与粘土矿物分析数据接近。通过实例还发现:溶解沉淀模型仅适用于粘土矿物内的转化问题，而化学动力学模型仅适用于伊/蒙间层内的转化问题。     

Fault throw determination using 4 component VSP: Aigion fault (Greece) case study

The present paper presents the results of a technique based on Vertical Seismic Profiling (VSP) to quantify the offset of a fault in a context where seismic reflection profiles do not image any reflectors. The case study is located in Greece, in the Aigion area, on the south border of the Corinth Gulf. The Aigion fault, oriented East–West, and dipping at 60°N, has been intersected by the scientific well Aig-10 at 760 m in depth, but some uncertainty remained concerning its exact offset since the depth of the pre-rift sequence is open to debate due to the lack of subsurface data. The pre-rift consists of a Mesozoic low-porosity series (carbonates and radiolarite), while the syn-rift consists of poorly compacted conglomerates and turbidites.

Seismic diffractions on fault edges are expected to be present along the fault surface. We find that a few diffracted events are effectively recorded in P and S wave mode by the 4 components of the VSP survey, and critically refracted arrivals along the Aigion fault plane. These singular events have been used in order to refine the fault geometry and to determine its throw. Additionally, results from a 2D finite difference elastic seismic model of a single fault step geometry have been closely examined in order to illustrate the generation of the singular seismic events observed on the field data, such as P-wave and S-wave refracted and diffracted events, and support their interpretation with higher confidence. As a result, the seismic arrival patterns from full waveform seismic modelling confirm the characterisation of the main fault geometry (mainly its throw: about 200 m) in the well vicinity derived from the actual analysis of the 4 Component Aigion VSP data.