Magnetostratigraphy of a Loess-Paleosol Sequence from Higher Terrace of the Daduhe River in the Eastern Margin of the Tibetan Plateau and Its Geological Significance

<正>The eolian deposits distributed in the river valleys in the eastern margin of the Tibetan Plateau(TP)are very useful in neotectonic and paleoclimatic studies.Firstly,the climate in the eastern margin of the TP is mainly controlled by the Indian summer monsoon,and detailed studies on the loess-paleosol sequences in this region can provide valuable terrestrial evidence of past changes in the Indian summer monsoon.Secondly,the river terraces in the eastern margin of the TP are considered to be a sensitive recorder of neotectonism to reflect the timing and amplitude of the TP uplift.The formation ages of these     

Characterization of Microscopic Pore Structures in Shale Gas Reservoirs of the Southeast Chongqing

<正>Unlike traditional resources,mud shale has the characteristics of low porosity,low permeability,small pore structure,nanoscale pore as the main body.The microscopic pore structures of mud shale can not only influence the occurrence state of shale gas and gas content,but also influence the hydrocarbon expulsion efficiency of source rocks,which makes the study of shale gas reservoir     

Sandstone Control Factors of Oil of the Third Member of Shahejie Formation in Dawangzhuang Area in Raoyang Sag

<正>In the process of oil and gas exploration,Hydrocarbon Assesment become more and more important.In this paper,the effection to hydrocarbon of the physical properties of the third member of Shahejie Formation in Dawangzhuang area is analyzed.By logging data analysis,the oil-saturation grade of Es3 in Dawangzhuang region can be divided into rich in oil,oil imersiond,oil     

Latest Progress and Trend Forecast of China's Shale Gas Exploration and Development

<正>1 Introduction With almost five years of efforts,we have made major breakthrough and important advances in shale gas in many areas,such as the marine and continental shale in Sichuan Basin,the continental shale in Erdos Basin and the transitional shale in North China.China has begun shale gas productivity constructions in many shale gas     

西南印度洋中脊热液区烃类有机质组成及其成因意义

利用气相色谱(GC)、气相色谱-质谱联用仪(GC-MS)测定了西南印度洋中脊49.6°E热液区热液产物中的可溶有机质,结合生物标志物和单体同位素分析,对烃类有机质的组成、来源及成因意义进行了探讨。硫化物烟囱体以正构烷烃(3.437~3.962μg/g)为主要烃类,L/H1,C22以上烷烃具有轻微奇碳数优势(CPI=1.140~1.209),NAR接近0;生物标志物类型丰富(Sq、IS40、烷基环己烷),C31藿烷22S/(R+S)高达0.77,且缺少17β(H),21β(H)构型藿烷;低碳数饱和脂肪酸为主要脂肪酸类型,异构/反异构脂肪酸含量显著,缺少单不饱和脂肪酸。热液蚀变岩以异构烷烃(2.094μg/g)为主要烃类,正构烷烃以低碳数(L/H=1.33)、偶碳优势(CPI=0.377)为特征;脂肪酸以单不饱和脂肪酸为主。结果表明,海洋原生生物体是49.6°E热液区主要的烃类有机质输入源,热液流体温度及化学条件是控制热液喷口区原生生物群落分布及热液产物中烃类有机质组成的主要因素。生物标志物类型显示硫化物烟囱体中具有产甲烷古菌与硫酸盐还原菌共存的现象,反映出热液流体中富含H2,表明49.6°E热液区具有非生物合成烃类的可能。     

羌塘角木日地区中二叠统龙格组泥岩地球化学特征及其地质意义

沉积岩物源分析对揭示盆地物质组成、储集岩性质及古环境恢复等研究具有重要指示意义。文中对藏北羌塘盆地角木日地区中二叠统龙格组的钙质泥岩样品进行了微量元素地球化学测试分析,系统地研究了微量元素含量、特征比值及稀土元素配分方式。结果表明研究区龙格组钙质泥岩样品具有中等轻稀土元素分异((La/Sm)N=2.50~5.41),重稀土元素比较平坦((Gd/Yb)N=1.32~2.47),具有微弱的Eu负异常;Sr/Ba,V/Cr,Ni/Co,Ceanom及δEu等相关参数综合显示,研究区中二叠纪时期整体表现为海相氧化环境;样品Rb/Sr比值及La/Th-Hf,La/Sc-Co/Th,Th/Sc-Zr/Sc关系图解综合说明龙格组钙质泥岩物源区风化作用较弱,源岩主要为安山岩;通过对沉积岩La/Sc-Ti/Zr,La-Th-Sc和Th-Sc-Zr/10等构造环境判别图解分析,综合表明区钙质泥岩物源区的构造背景主要为大洋岛弧型。     

基坑变形非等时距灰色预测模型程序设计及应用

根据牛顿插值平均法对非等时距基坑累计位移变化量进行等时距变换,结合灰色系统理论,建立非等时距灰色GM(1,1)模型,并采用VB与MATLAB编程语言对该模型进行编程实现,更加高效、直观、准确地对基坑变形进行了分析预报.结合某工程前数期的实测数据进行建模、分析和预测,取得了良好的效果.     

测绘专业研究生创新能力培养模式探讨

重点实验室与工程科研中心是国家科技创新平台体系的重要组成部分,在科研平台的支持下,针对如何培养具有创新能力的研究生和提高研究生的科研素质的问题,该文结合矿山空间信息技术国家测绘地理信息局重点实验室在研究生创新能力培养上的做法,从多元化培养模式、开放式科研创新模式、科研考核等多个方面对测绘专业研究生创新能力培养模式进行探讨。     

高山地区地形对重力测量的影响分析

针对高山地区地形改正研究的不足,文章以青藏高原为实例,利用快速傅里叶变换详细讨论了高山地区地形改正中质量柱模型与质量线模型对重力测量的影响。研究结果表明:青藏高原地区,地形对重力测量的影响达到毫伽量级;采用快速傅里叶变换计算地形改正时,其最佳计算阶数应为二阶;高山地区,采用质量柱模型与质量线模型进行地形改正的差异为0.1mGal量级。     

执行2009版《全球定位系统(GPS)测量规范》若干问题的研究

结合技术人员在执行《全球定位系统(GPS)测量规范》(GB/T18314—2009)时的不同理解和认识,通过对基线测量中误差、环闭合差、相邻点基线分量中误差和GPS网平差技术指标等的计算与实现,进行了理论分析和实践探讨,得出规范可以得到较好执行的结论。