滇东地区页岩气调查云宣地1井钻探施工难点及对策

云宣地1井是滇东地区一口小口径页岩气调查井,该井主要钻遇了寒武系、泥盆系、石炭系及二叠系地层。钻探施工过程中遇到了恶性漏失、裂缝性漏失、岩石挤压破碎及井内掉块等井下复杂情况。通过钻头优选、钻井液优化、多种堵漏措施相结合、顶漏钻进及侧钻施工技术等针对性措施,解决了大套灰岩地层因大型溶洞或纵向裂隙发育而引起的恶性漏失、井内掉块等问题,避免了钻井液密度过大而导致井壁失稳的井下复杂情况的发生,提高了机械钻速,保证该井顺利完钻。该钻探施工经验可为后期滇东地区复杂灰岩地层钻探施工提供借鉴。     

采用目标端元修正的高光谱混合像元盲分解

针对非负矩阵盲信号分离(NMF)用于混合像元分解易陷入局部极小值的不足,将非监督端元提取与盲分解方法相结合,构建了一种基于目标端元修正的混合像元盲分解模型(ATGP-NMF)。ATGP-NMF模型利用非监督正交子空间投影算法(ATGP)和非负最小二乘法(NNLS)获取NMF盲分离的初始值,然后将获得初始目标端元光谱与丰度输入NMF模型,通过迭代运算不断逼近优化目标而得到最终的端元光谱和端元丰度。为了检验模型对于各类数据的有效性和适用性,将ATGP-NMF与传统NMF分别应用于模拟仿真数据、室内控制数据和真实遥感影像3类实验数据进行分析验证。结果表明,ATGP-NMF模型具有较好的适用性,在没有先验信息、先验信息很少,以及纯像元假设不存在情况下都能较好地分解混合像元,且能够更好克服局部极小问题,提高混合像元分解的精度。     

广西昭平大王顶金矿床深部盲矿预测的构造叠加晕模型

广西大王顶金矿为热液型金矿,成矿严格受岩体和构造控制,成矿具有多期多阶段叠加特点。文章总结了该矿床及不同阶段元素组合,在研究单一次成矿形成的原生晕轴向分带和识别出不同成矿阶段形成矿体(晕)在空间上的叠加结构基础上,建立了矿床的构造叠加晕模式,确定了盲矿预测标志,对矿床深部给出了盲矿靶位。     

冀中坳陷廊固凹陷古近系层序地层与隐蔽油气藏勘探

应用层序地层学的理论分析廊固凹陷古近系将划分为1个一级层序、3个二级层序(Ⅰ,Ⅱ,Ⅲ)、11个三级层序(SQ 1~SQ 11),发现层序构造演化研究廊固凹陷经历了断陷初始期、强烈断陷期、断陷回返上升期及断陷消亡期4个阶段,与层序有关的(生)储盖组合在廊固凹陷十分发育,廊固凹陷旧州-固安构造带是隐蔽油气藏发育的有利区带,在SQ 4~SQ 7近岸水下扇或扇三角洲砂体向湖泊泥岩尖灭带附近与构造单斜的结合部位,是形成上倾尖灭岩性油藏的的有利部位,该带SQ 1~SQ 3(沙四段)发育的近岸水下扇砂体或砾岩体是廊固凹陷古近系深部油气(特别是天然气)的重要勘探方向。     

Blind deconvolution methodology for site-response evaluation exclusively from ground-surface seismic recordings

A novel blind deconvolution methodology for identification of the local site characteristics based on two seismograms recorded on the free surface of a sediment site is presented. The approach does not require recordings at depth nor at a nearby rock outcrop, and eliminates the need for any prior parameterization of source and site characteristics. It considers that the surface recordings are the result of the convolution of the ‘input motion at depth' with transfer functions (channels) representing the characteristics of the transmission path of the waves from the input location to each recording station. The input motion at depth is considered to be the common component in the seismograms (same input in a statistical sense). The channel characteristics are considered to be the part in the seismograms that is non-common, since the travel path of the waves from the input motion location at depth to each recording station is different, due to spatially variable site effects. By means of blind deconvolution, the algorithm eliminates what is common in the seismograms, namely the input motion at depth, and retains what is different, namely the transfer functions of the site from the input location to each recording station. It estimates the site response in both frequency and time domains, and identifies the duration of the site's transfer functions. The methodology is applied herein to synthetic data at realistic sites for performance validation. The blindly estimated results are in almost perfect agreement with the actual site characteristics, indicating that the approach is a promising new tool for seismic site-response identification from recorded data.     

基于查找表的激光雷达图像快速绘制算法

传统雷达图像的绘制一般采用直接的实时坐标变换算法,这种算法效率较低,而且无法从根本上解决雷达图像的死地址和显示盲区现象根据激光雷达特点以及图像绘制需求,设计并实现了一种基于查找表的激光雷达图像快速算法,能大大提高激光雷达图像的绘制速度,并能够较好地解决图像的死地址和显示盲区现象.     

欠定盲源分离的稀疏分量分析方法

分析了解决欠定盲源分离问题的稀疏分量分析方法,通过聚类算法得到混合矩阵的估计,通过优化算法恢复源信号。总结了各种实现"聚类"和"优化"的具体方法,论述了欠定盲源分离和稀疏分量分析、压缩传感之间的紧密联系,对欠定盲源分离进行了展望。     

Stability evaluation and protection of slope for Laosongling-Yanji Highway

The authors analyzed the engineering geological characteristics of the slope of the study area （ K75 ＋ 840-K76 ＋ 340）. Two typical cross-sections have been chosen to analyze the failure modes after the excavation of the highway. Different types of the failure modes have been calculated and analyzed. The results show that some dealing methods have been advised to ensure the stability of the slopes.     

一种基于扩频码滤波的盲波束形成算法

通过研究分析传统的应用于CDMA系统的自适应波束形成带给系统的复杂度,采用先把接收信号与本地扩频码相乘解扩后再进行基于扩频码滤波的波束形成技术,并基于最大化信干噪比准则,提出一种计算复杂度小、在不同通信环境下性能良好的综合方案.仿真结果证实了算法的有效性.     

从患病黑鲪分离病原菌HV0811的鉴定及其系统发育分析

从症状为溃疡瞎眼的养殖黑鲪(Sebastodes fuscescens)病灶处分离到3株优势菌HV0811、PT0811和JH0811,以肌肉注射人工感染实验证实菌株HV0811为致病菌,其对黑鲪的半致死浓度为7.15×10~5 CFU/尾。通过对致病菌的形态学观察、生理生化分析表明:菌株HV0811为革兰氏阴性菌,极生单鞭毛,短杆状,直径1～3mm,需Na+生长,低于4℃、高于42℃不生长。基于16SrRNA和HSP60基因序列构建的系统发育树表明:HV0811分别与哈维氏弧菌(AY750578和AY332571)相类聚,其中16SrRNA基因序列与哈维氏弧菌(AY750578)聚合置信度较低,仅有10%,不能有效地确定该种;HSP60基因序列与哈维氏弧菌(AY332571)聚合为一个分支的置信度达100%。综合该菌的形态、生理生化及HSP60基因序列比对结果,表明分离到的病原菌HV0811为哈维氏弧菌。药敏试验结果显示病原哈维氏弧菌(HV0811)对庆大霉素、新霉素、氟哌酸等较为敏感。