英吉苏凹陷碎屑锆石测年及其对沉积物源的指示

首次应用碎屑锆石LA-ICP-MSU-Pb定年方法,研究塔里木盆地英吉苏凹陷中生界物源.单颗粒碎屑锆石测年结果表明,侏罗系物源年龄值有3组:350~500Ma、760~970Ma、1400~1600Ma;白垩系物源年龄值有2组:320~380Ma、1400~1800Ma.碎屑锆石测年数据分析表明,阿尔金山是本区侏罗系的主要物源区,奥陶纪末—志留纪的火成岩是侏罗系的主要物源;侏罗系上下层位测年数据有反序特征,是经历再搬运沉积的产物;白垩纪英吉苏凹陷物源区发生南北反转,物源来自北部库鲁克塔格山;中生界最古老的物源来自中元古代.碎屑锆石年龄的变化反映了本区中生界盆山耦合关系.     

Distribution of lipids in modem soils from various regions with continuous climate (moisture-heat) change in China and their climate significance

Total 26 modern soil samples were collected from various regions under different climate conditions from tropical to arid temperate in China and systematically analyzed for their organic matters by GC/MS in order to evaluate climatic impacts on soil organic components. Abundant lipids molecules were recognized, including n-alkanes, n-alkenones, and long-chain branched alkanes. We find the predominance of main peaks of long-chain n-alkanes (nC29,nC31,nC33) and short-chain ones(nC16,nC17,nC18) records information of soil generation in warm-humid and cold-dry regions. The proportion of n-alkanes(nC16+nC17+nC18)to(nC29+nC31+nC33)varies in good agreement with moisture-heat conditions and thus probably can serve as a new index for climate change. The ratios of C21-/nC22+,nC17/nC31 and (nC15+nC17+nC19)/(nC27+nC29+nC31)of n-alkanes, indicating respectively input ratios of lower bacterial alga, aquatic organisms, and higher plants and terraneous organisms, co-vary well in different climate regions from forest to grassland and desert, suggesting that they have also reflected the difference of climates between monsoon region and inland one. The C21-/C22+ ratio of n-alkan-2-one records largely the discrepancy of temperature from north to south of China bordered by the Qinling Mountains, but less humidity. The C21-/C22+ ratio of n-alkan-3-ones changes well with climatic factors, such as temperature and humidity. The biogenic source of series A-D long-chain branched alkanes may be derived from some kinds of special epiphyte that most likely live in weak oxic-anoxic and moisture-heat environments, suggesting their distribution record as well some information on climatic change. All these researches demonstrate that the distributions of lipids molecules in modern soils in China record well signals of climates from quite different climatic regions, and can serve as important climatic proxies to reveal climatic change over China.     

Natural gas leakage of Mizhi gas reservoir in Ordos Basin, recorded by natural gas fluid inclusion

Abundant natural gas inclusions were found in calcite veins filled in fractures of Central Fault Belt across the centre of Ordos Basin. Time of the calcite veins and characteristics of natural gas fluid inclusion were investigated by means of dating of thermolum luminescence (TL) and analyzing stable isotope of fluid inclusion. Results show that natural gas inclusion formed at 130―140℃ with salinity of 5.5 wt%―6.0 wt% NaCl. It indicates that natural gas inclusion is a kind of thermal hydrocarbon fluid formed within the basin. Method of opening inclusion by heating was used to analyze composition of fluid inclusion online, of which the maximal hydrocarbon gas content of fluid inclusion contained in veins is 2.4219 m3/t rock and the maximal C1/Σci ratio is 91%. Laser Raman spectroscopy (LRS) was used to analyze chemistry of individual fluid inclusion in which the maximal hydrocarbon gas content is 91.6% compared with little inorganic composition. Isotope analysis results of calcite veins show that they were deposited in fresh water, in which the δ13CPDB of calcite veins is from -5.75‰ to 15.23‰ andδ18OSMOW of calcite veins is from 21.33‰ to 21.67‰. Isotope results show thatδ13C1 PDB of natural gas fluid inclusion is from -21.36‰ to -29.06‰ and δDSMOW of that is from -70.89‰ to -111.03‰. It indicates that the gas of fluid inclusion formed from coal source rocks and it is the same as that of natural gas of Mizhi gas reservoir. Results of TL dating show that time of calcite vein is (32.4±3.42)×104 a, which is thought to be formation time of gas inclusion. It indicated that natural gas inclusion contained in calcite veins recorded natural gas leakage from Mizhi gas reservoir through the Central Fault Belt due to Himalayan tectonic movement.     

3维地图模型的若干研究

重点阐述3维地图模型的概念与特性,深入研究3维地图模型的内容与逻辑组成,并在此基础上对3维地图的创建与可视化进行探讨。     

直线上点的连续放样法

介绍在直线上两已知点通视与不通视情况下,在直线外任意设站放样直线点的方法。该法采用傍导线法可以灵活、方便地放出障碍物间一系列直线点。     

HHT方法在研究地震旋回体中的应用

HHT(Hilbert-Huang变换)是一种近年才发展起来的非线性信号处理方法,具有明确的物理意义、高度的精确性和自适应性,但在地震信号处理中尚未得到广泛的应用。简要介绍了HHT的方法原理,然后分析了模型信号和地震旋回体的HHT时频谱。结果表明:HHT对模型信号的识别能力强,且不同类型地震旋回体与其HHT时频谱之间存在对应关系,这为地震层序的划分以及进一步的沉积相分析提供理论依据。     

一种改进的无人机影像拼接粗差剔除算法

利用无人机技术可以获取高分辨率影像。为了获取高精度的变换矩阵,提高影像匹配效率,本文对RANSAC算法进行了改进,加入影像的灰度信息进行约束,进一步剔除匹配粗差,最后采用均方根误差进行质量评判。为了验证算法的可靠性,选取一组山区影像和一组具有旋转偏角的建筑物影像进行验证。验证结果表明,匹配点粗差剔除率分别提高了15.15%和23.22%,本文算法的均方根误差较小,精度有显著的提高。     

GPS���μ������ȡ��������ĵ���Ԫ���㷽���о�

????????????????????????L₁???????????????????GPS????????μ???????????????μ??????????????????????????????????ARCE??????????????????????????????????±1??????????????????п????????????????????????????????L₁?????????????????????????????????????????Ч???????????????????????????ú???Ч????     

湘西北五峰—龙马溪组层序地层特征及有机质富集探讨——以XY-3井为例

湘西北地区上奥陶统五峰组—下志留统龙马溪组海相黑色页岩发育广泛,且厚度大、热演化高、埋深相对适中,具有较好的页岩气勘探开发前景.为了研究湘西北五峰—龙马溪组地层层序特征,基于XY-3井GR测井曲线的小波变换,结合元素地球化学特征、有机质丰度、笔石类型和岩性特征,建立研究区内五峰—龙马溪组层序格架,并探讨层序格架内有机质差异富集的特征.结果 表明:XY-3井五峰—龙马溪组共划分为2个三级层序SQ-1和SQ-2,4个体系域分别为TST1、HST1、TST2和HST2.而HST1和HST2体系域内有机质丰度相对较低,总有机碳平均值为0.89％和0.26％,其沉积于沉积速率相对较高、古生产力较高,且陆源输入量相对高的氧化环境中;TST1和TST2体系域内有机质丰度相对较高,总有机碳平均值为1.46％和1.35％.其沉积于沉积速率相对较小、古生产力较高,陆源碎屑输入较少的贫氧化环境中.与长宁、焦石坝地区五峰—龙马溪组内同期揭露的富有机质层位相比,湘西北XY-3井富有机质层段沉积于氧化性相对较强、古生产力相对较高的环境中,而在沉积速率相对较低的情况下,其富有机质页岩的沉积厚度和有机质丰度明显偏低.这可为湘西北地区进行页岩气勘探开发提供指导意义.     

基于ROS的遥控水下机器人监控系统研制

为了降低水下机器人开发复杂度,增加机器人的适应性和开放性,基于ROS （机器人操作系统）研制了遥控水下机器人监控系统.首先简单介绍了遥控水下机器人监控系统的硬件结构,提出了基于ROS的遥控水下机器人监控系统软件框架,介绍了感知执行层、导航控制层和监视操作层的组成及作用,描述了运动控制节点、人机交互节点、姿态控制节点3个功能模块的设计方法.实验表明,基于ROS开发的水下机器人监控系统能很好地协调感知模块、运动控制模块和人机交互模块等各个节点的工作,具有开发周期短、扩展性较好等特点.