南海及邻域中,新生代盆地类型与油气资源关系探讨   总被引：9，自引：1，他引：8  

杜德莉  曾维军 《地质论评》1998,44(6):580-589

在南海区域地质构造特征及周缘盆地发育特点的基础上,根据盆地分类的理论,试将南海及周缘的３５个中、新生代盆地,划分为两型十一类。各主要盆地的油气地质特点表明,不同类型的盆地,其油气远景不同。分析认为,在板内拉张离散环境中所形成的盆地,含油气远景最佳,是目前勘探和开发的重点。  相似文献   

南中国海10 m风和海面动态粗糙度特征研究   总被引：1，自引：1，他引：0  

赖鑫  王德立  江崟  蔡然  高瑞泉 《气象》2016,42(12):1531-1539

根据海面粗糙度(z_0)与海面10 m风速的关系,本文提出一种适用于海上10 m风速求解算法。通过和ERA-Interim风速比较,发现用这种动态z_0法订正的风速比固定z_0法更接近ERA-Interim风速,相关性更好。基于这种动态z_0法,利用南中国海两个海上平台站的资料,计算得到近4年逐时10 m风速及对应的动态粗糙度。分析发现风速主要集中在3~13 m·s~(-1),4—9月平均风速较小,从10月到次年3月平均风速较大。从风速日变化来看,14—17时风速达到最小;06一09时达到最大。另外,z_0有明显的季节变化和日变化,与风速变化一致。分析了台风韦森特中心过境时,气象要素的变化说明订正后的风速及z0_0符合实际观测值。  相似文献   

基于空间聚类的城镇土地定级方法研究   总被引：9，自引：1，他引：9  

王海军  张德礼 《武汉大学学报(信息科学版)》2006,31(7):628-631

分析了多因素综合评定法、级差收益测算法等城镇土地定级方法的不足，提出了基于空间聚类的地价分区定级法的主要思想和主要步骤，并以石狮市土地定级为例，验证了此方法。  相似文献   

滇西南澜沧江带官房铜矿矿床成因和成矿模式探讨   总被引：4，自引：0，他引：4  

张彩华  刘继顺  刘德利 《大地构造与成矿学》2006,30(3):369-380

官房铜矿是南澜沧江构造岩浆带正在勘探的规模较大的铜矿床,本文归纳整理了该矿床的地质特征,并结合微量元素和稳定同位素,对矿床成因、成矿模式进行了初步探讨,指出了区域找矿的方向。铜矿化主要与硅化和黄铁矿化有关,含矿岩石为上三叠统小定西组富钾基性火山岩,其稀土元素表现为轻稀土富集型,无或弱的负Eu异常;微量元素配分型式以K、Rb、Ba、Th强烈富集,Ti、Y、Yb、Cr明显亏损为特征,与石英脉型铜矿石存在明显的差异。矿体严格受放射状断裂和岩性双重控制。矿石硫同位素组成稳定,δ34SV-CDT变化范围为-11.88‰～-5.67‰,主要为深源硫。流体包裹体的成分和氢氧同位素组成表明成矿流体为大气降水和岩浆水的混合流体。地质和地球化学特征表明官房铜矿属浅成中-低温热液矿床,形成于相对开放的系统,成矿与隐伏岩体的岩浆作用有明显的成因联系。  相似文献   

扬子板块东北缘的随县－应山地区早古生代沉积盆地演化     

杨振强  杨德骊  蒋德和 《沉积与特提斯地质》1994,(5)

位于扬子板块和大别变质地体之间的随－应地区，早古生代是一被动大陆边缘扩张盆地。根据沉积盆地基底、地层层序、沉积体系和火山岩亲缘关系，随一应地体的发展史可追溯到晚元古代，并划分为４个阶段：（１）晚元古代至早震旦世地壳上拱和拉伸阶段；（２）晚震旦世至早寒武世被动大陆边缘阶段；（３）中寒武世至奥陶纪海底扩张阶段；（４）志留纪至泥盆纪盆地充填回返阶段。本区沉积盆地发育模式是由大陆边缘裂谷盆地转化为前陆盆地模式。  相似文献   

Genetic and morphological divergence in the purple sea urchin Paracentrotus lividus (Echinodermata, Echinoidea) across the African Mediterranean coast     

Temim Deli  Mohamed Hbib Ben Atti  Rym Zitari-Chatti  Khaled Sai  Noureddine Chatti 《海洋学报(英文版)》2017,36(12):52-66

The present investigation focuses on population structure analysis of the purple sea urchin Paracentrotus lividus across the African Mediterranean coast, with the main aim of assessing the influence of the Siculo-Tunisian Strait on gene flow disruption in this highly dispersive echinoid species. For this purpose, patterns of morphological and genetic variation were assessed among its populations from the western and eastern Mediterranean coasts. A total of 302 specimens from seven Tunisian sites were collected and examined for morphometric variability at twelve morphometric traits. Concordant results, inferred from CDA (canonical discriminant analyses), pairwise NPMANOVA (non parametric multivariate analysis of variance) comparisons and MDS (multidimensional scaling) plot, unveiled significant inter-population differences in the measured traits among the studied populations. Furthermore, the combined use of the one way ANOSIM (analysis of similarities) and the Discriminant/Hotelling analysis allowed unravelling two morphologically differentiated groups assigned to both western and eastern Mediterranean basins. The SIMPER (similarity percentages) routine analysis showed that total dry weight, test diameter and spine length were major contributors to the morphometric separation between locations and between groups. Pattern of phenotypic divergence discerned in P. lividus across the Siculo-Tunisian Strait is interestingly in congruence with that inferred from the genetic investigation of the purple sea urchin populations from the same region based on the analysis of the mtDNA COI (cytochrome oxidase I) gene in 314 specimens from nineteen locations covering a wider geographic transect, streching westward to the Algerian coast and eastward to the Libyan littoral. The specific haplotypic composition characterizing each Mediterranean basin, as inferred from the minimum spanning network, confirmed the geographic partioning of genetic variation, as revealed by F-statistics and AMOVA (analysis of molecular variance) analyses, yielding significant genetic differentiation between eastern and western Mediterranean populations. The newly detected phylogeographic patterns, observed for the first time in P. lividus throughout the explored distribution range, suggest the involvement of different biotic and abiotic processes in shaping such variation, and provide evidence that a large and geographically exhaustive dataset is necessary to unveil phylogeographic structure within widespread marine species, previously cathegorized as panmictic in part of their distribution range.  相似文献   

Curvelet-domain multiple matching method combined with cubic B-spline function     

Tong Wang  Deli Wang  Mi Tian  Bin Hu  Chengming Liu 《Acta Geophysica》2018,66(4):559-573

Since the large amount of surface-related multiple existed in the marine data would influence the results of data processing and interpretation seriously, many researchers had attempted to develop effective methods to remove them. The most successful surface-related multiple elimination method was proposed based on data-driven theory. However, the elimination effect was unsatisfactory due to the existence of amplitude and phase errors. Although the subsequent curvelet-domain multiple–primary separation method achieved better results, poor computational efficiency prevented its application. In this paper, we adopt the cubic B-spline function to improve the traditional curvelet multiple matching method. First, select a little number of unknowns as the basis points of the matching coefficient; second, apply the cubic B-spline function on these basis points to reconstruct the matching array; third, build constraint solving equation based on the relationships of predicted multiple, matching coefficients, and actual data; finally, use the BFGS algorithm to iterate and realize the fast-solving sparse constraint of multiple matching algorithm. Moreover, the soft-threshold method is used to make the method perform better. With the cubic B-spline function, the differences between predicted multiple and original data diminish, which results in less processing time to obtain optimal solutions and fewer iterative loops in the solving procedure based on the L1 norm constraint. The applications to synthetic and field-derived data both validate the practicability and validity of the method.  相似文献   

3D numerical simulation in acoustic-elastic coupled media with staggered-grid finite-difference method     

PENG Changhua  WANG Deli  ZHOU Jinju 《世界地质(英文版)》2019,22(2):112-120

Acoustic-elastic coupled media is often encountered in most marine explorations, and accurate simulation of acoustic-elastic coupled media is of great significance. At present, the study of acoustic-elastic coupled media still assumes that the solid of the acoustic-elastic coupled media is isotropic, but this assumption is not in accordance with the actual situation. In this paper, we derive the solid media of acoustic-elastic coupled media from isotropic media to anisotropic media, and propose an acoustic-elastic coupled medium based ontransverse isotropic media with vertical symmetric axes(VTI) to improve the accuracy of forward modeling. Based on the relationship between the Thomsen parameter and the coefficient matrix of the anisotropic elastic wave equation, we transform the Thomson parameter into a velocity model with anisotropic properties. We use a staggered grid finite difference method to simulate the propagation of a wavefield in a three-dimensional acoustic-elastic coupled media. We obtain the snapshots of the wave field when the solid of the acoustic-elastic coupled media is an isotropic medium and a VTI media. When the solid of the acoustic-elastic coupled media is considered VTI media, we can observe the qP wave and qS wave that cannot be observed in the isotropic medium from the wave field snapshot. We can also find that the seismic records obtained by the method we use are more realistic. The algorithm proposed in this paper is of great significance for high-precision ocean numerical simulation.  相似文献   

一种基于全站扫描的特征点自约束点云变形分析方法     

汪冲  范百兴  皮刚  王德利  向民志 《测绘通报》2019,(1):44-49

为了对大坝、高层建筑、滑坡区、采空区等危险变形体进行变形观测,针对智能全站仪、GNSS测量、三维激光扫描等变形监测技术无法很好地实现变形特征点和点云的综合变形分析问题,提出了基于全站扫描特征点自约束点云变形分析方法,获取变形体的离散特征点和整体点云变形数据,利用特征点形变矢量求取点云至模型的形变量,从而刻画变形体的整体形变信息。试验结果表明,利用本文所提出的方法能够成功计算出点云至模型的形变量,经统计分析,所有点的形变量真误差的期望值为-0.04 mm,结果精度为1.2 mm。试验结果能够反映变形体的整体形变信息,且具有较高精度。  相似文献   

基于MapX的天气雷达反演雨量系统的设计与实现     

吴建华  牛德力  刘松林 《测绘信息与工程》2010,35(3):19-20

提出了天气雷达反演雨量的技术方案,说明了实现雨量反演的关键技术和难点,介绍了基于MapX的天气雷达反演雨量系统的功能与实现。  相似文献