内蒙古浩布高铅锌矿床小罕山岩体年代学、Hf同位素及地球化学特征

内蒙古赤峰浩布高铅锌矿床大地构造位置位于大兴安岭地区南段,属黄岗梁—甘珠尔庙褶皱成矿带.对浩布高铅锌矿床小罕山岩体进行了详细的岩石学、年代学、岩石地球化学和Hf同位素研究.结果显示:小罕山岩体主要岩石类型为二长花岗岩,形成于(143.9±1.1)Ma,属于早白垩世;地球化学组成上表现出高硅(SiO2=66.96％ ～6...     

Influences of forest on MODIS snow cover mapping and snow variations in the Amur River basin in Northeast Asia during 2000–2014

The study applies the improved cloud‐free moderate resolution imaging spectral radiometer daily snow cover product (MODMYD_MC) to investigate the snow cover variations from snow hydrologic year (HY) HY2000 to HY2013 in the Amur River basin (ARB), Northeast Asia. The fractions of forest cover were 38%, 63%, and 47% in 2009 in China (the southern ARB), Russia (the northern ARB), and ARB, respectively. Validation results show that MODMYD_MC has a snow agreement of 88% against in situ snow depth (SD) observations (SD ≥ 4 cm). The agreement is about 10% lower at the forested stations than at the nonforested stations. Snow cover durations (SCDs) from MODMYD_MC are 20 days shorter than ground observations (SD ≥ 1 cm) at the forested stations, whereas they are just 8 days shorter than ground observations (SD ≥ 1 cm) at the nonforested stations. Annual mean SCDs from MODMYD_MC in the forested areas are 21 days shorter than those in the nearby farmland in the Sanjiang Plain. This indicates forest has a complex influence on the snow accumulation and melting processes and even on optical satellite snow cover mapping. Meanwhile, SCD and mean snow cover are negatively correlated with air temperature in ARB, especially in the snow melting season, when mean air temperature in March and April can explain 86% and 74% of the mean snow cover variations in China ARB and Russia ARB, respectively. From 1961 to 2015, the annual mean air temperature presented an increased trend by 0.33 °C/decade in both China ARB and Russia ARB, whereas it had a decrease trend from HY2000 to HY2013. The decrease of air temperature led to an increase of snow cover, which is different from the global decrease trend of snow cover variations. SCD and snow cover had larger increase rates in China ARB than in Russia ARB, and they were larger in the forested areas than in the nearby farmland in the Sanjiang Plain.     

基于6S模型的山区环境星影像大气校正研究

针对山区地形复杂,高程变化较大的特点,利用6S辐射传输模型建立查找表,结合研究区DEM对影像进行了大气校正。试验结果表明,校正后的影像清晰度、对比度提高了,消除了大气对NDVI的负面影响。     

泌阳凹陷安棚地区油气成藏条件及富集主控因素

泌阳凹陷为—东秦岭褶皱带上发育起来的中新生代箕状断陷.安棚地区位于该凹陷东南部,来自南部陡坡带的扇三角洲砂体与安棚鼻状构造配置形成以砂岩上倾尖灭为主要圈闭类型的油气藏.油气储层成岩演化阶段进入晚成岩B期,成岩作用较强,储层物性较差,具低孔低渗特征.但沿鼻状构造的轴部微裂缝较发育,改善了储层储集性能.研究认为,丰富的油源...     

核旋绝对观测资料的精度分析及检验

在收集河南省及邻省地磁台的核旋绝对观测资料基础上,应用最小二乘法原理进行线性空间相关分析和精度检验。结果表明,三类地磁台核旋观测资料精度较高,F总强度不仅精度高且稳定性好。尤其是郑州-信阳台间各项精度指标均名列前茅,显示出内在质量的优越性。     

盆地分析和油藏描述在河南三春集地区的应用效果

盆地分析与油藏描述代表了当代石油地质科学研究的发展方向,它们以高度综合性和定量化为显著标志,大大推进了油气勘探与开发。作者连续几年对三春集等地区先后作了盆地构造岩相分析和精细油藏描述,通过前者建立了该区构造岩相模式,指出了油气富集规律,指导了勘探布置;通过后者建立了油藏地质模型,具体地提出了精细勘探和改善开发效果的建议。最后指出盆地构造相分析法和油藏描述技术应大力推广。     

RFT资料在多井储层评价中的应用

本文以东濮凹陷马厂地区为研究工区着重论述重复式地层测试(RFT)资料在多井储层评价中的应用。利用压力资料可定性、定量判断储层的渗透性,估算渗透率值可用于油层有效厚度标准研究,压力随深度梯度变化转换为密度变化来了解流体性质、确定油水界面,从而验证测井多井解释结论。研究表明,应用效果明显,解释结论得到试油试采证实,解释符合率提高,研究成果有助于研究工区油藏综合评价,部分成果已用于油田生产。     

岩土钻探工程大口径钻头设计与应用

分析对比了多种岩土钻探工程大口径钻头的优缺点，设计了适应不同地层的大口径钻头。     

Experimental study on ultrasonic propagation in water-based bentonite slurry

Drilling fluid is a common flushing medium used in pile foundation, geological drilling and petroleum drilling. Study on ultrasonic propagation properties in drilling fluid is of vital importance, not only for developing equipments to non-contact measuring concrete casting level for bored pile, but also for developing equip- ments considering drilling fluid as signal channel. The existence of clay particles makes the ultrasonic propagation and attenuation in drilling fluid much different from pure water. In order to know the relation among ultrasound frequency, slun-y density and depth, a series of laboratory experiments about ultrasound propagation in water-based bentonite slurry were finished. Wavelet method was adopted to process the gained original waves of ultrasonic propagation in slurry, so we knew the velocity and attenuation coefficient of ultrasound propagated in different drilling fluids with different density. The first group experiments shows that with density of drilling fluid increase, ultrasonic velocity will decrease but attenuation coefficient will increase if ultrasonic frequency keep constant. The second group experiments shows that the power of ultrasound will intensify in small bore hole, the attenuation coefficient is much smaller than theoretical value.