东濮凹陷东南部下第三系地震地层学研究

依据地震反射终止关系和地震反射波特征，将东濮凹陷东南部第三系划分成两个地震层序和九个亚层序，在近万里的地震剖面上，依据可信度较高的地震反射内部结构和外部形态，识别出前积反射等地震相类型。在综合考虑盆地结构和古地理背景的基础上，利用地质、测井等地震相沉积相之间的对应关系，得出了沉积体系的平面分布和垂向演化规律。     

歧口凹陷滩海区下第三系地震反射特征及层序划分

本文主要利用地震反射同相轴的终止形式和不连续类型，对歧口凹陷滩海区下第三系地层进行层序的划分，并对不同体系域内部及层序界面的地震反射特征进行较为详尽的描述。研究结果表明，歧口凹陷下第三系发育有六个层序，每个层序的顶、底界面分别对应于区内七个地震反射界面。不同成因及不同沉积环境的层序内部具有不同的地震反射相。并讨论体系域与油气赋存的关系。     

苏北盆地高邮凹陷古近系戴南组地震相研究

为了全面地研究高邮凹陷戴南组的层序发育分布和沉积充填史,依据层序地层学的划分方法,将高邮凹陷戴南组划分为3个三级层序;根据地震反射参数,从内部反射结构和外部几何形态出发,结合反射同相轴的振幅和连续性,在高邮凹陷戴南组的地震反射剖面上识别出平行—亚平行席状、前积楔状、上超充填状、杂乱充填状以及杂乱席状等地震相类型.研究表明,这些地震相在平面上分布部位明确,纵向上具有继承性和差异性;地震相在空间上的分布与凹陷结构及构造演化有良好的对应关系.     

兴马地区沙三段地震相和沉积相分析

 针对兴马地区沙三段重力沉积砂体非均质性强、横向变化快、储层预测难度大的问题,运用层序地层分析和波形分类技术,在层序格架内基于储层沉积特征和地震反射特征,建立储层特征与地震波形的对应关系,较好地预测了重力沉积砂体的空间展布。结果表明,研究区沙三段可分为3个层序,构成3个“下粗上细”的沉积旋回;在各旋回中,重力沉积砂体均表现为强振幅、中低频、中好连续反射,平面上可构成10类地震相和3个地震相区,分别对应中扇辫状沟道微相、中扇前缘微相和外扇浊积岩-湖泊相;对比各层序,层序SQ3和层序SQ2的南部地区重力沉积砂体最为发育,为最有利的勘探目标区。     

准噶尔盆地车排子地区新近系沙湾组层序地层学研究

根据陆相地层层序在地震剖面和电测曲线上的识别标志、合成记录标志以及岩石类型组合特点等方面的特征，将车排子地区新近系沙湾组划分出1个二级层序、2个三级层序。其中层序Ⅰ为辫状河三角洲层序，层序Ⅱ湖泊层序。各层序又可以根据其特点划分为3个体系域，即低水位体系域、湖侵体系域和高水位体系域。并初步分析了层序与含油气性的关系，预测了不同层序的勘探重点和目标，认为层序Ⅰ的低位域和层序Ⅱ的湖侵域为寻找岩性油气藏的有利部位。     

松南梨树断陷高精度地震层序及地震沉积相识别

依据地震反射波终止关系,在研究区地震剖面识别出基岩顶面、地层侵蚀不整合面、地层超覆不整合面、地层平行不整合面这4种地震层序界面,将断陷层地震单元划分为5个地震层序(SQ1~SQ5),从而建立梨树断陷高精度地震层序地层格架。以外部几何形态、内部反射结构、振幅、连续性、频率、波形和层速度等参数为依据,在研究区内共识别出弱振幅中连续亚平行、中振幅好连续平行、中振幅中连续乱岗状、中振幅好连续上超充填、强振幅差连续杂乱、叠瓦状前积、楔状体、侵蚀河道、丘形共9种反射地震相类型。结合三维地震属性(均方根振幅和平均能量)分析,以较高的精度和合理性分析区域地震沉积相分布规律。研究结果表明:各层序体系地震沉积相分布既具有北部、东南部物源在各时期相对稳定且持续发育的明显继承性,又存在其空间展布范围此消彼长的阶段性特点。     

南图尔盖盆地几种典型地震相分析及其地质意义

以地震地层学、层序地层学的理论为指导,依据地震反射参数,充分利用地震反射的内部结构、外部形态,结合振幅、频率、连续性等特点,对南图尔盖盆地下侏罗统-下白垩统10个地震层序进行地震相识别,划分出中振幅-中连续前积反射、中振幅-中连续上超反射等6种典型地震相。这些地震相在平面上具有明显差异性,纵向上具有一定继承性与阶段性,继承性表现在盆地西部物源、东部物源在各个不同时期相对稳定,持续发育,其空间分布变化不大;阶段性则表现在不同层序可分为三个组合:SQ1-SQ4时期(阶段Ⅰ)地震相类型差异大,相带变化快;SQ5-SQ8时期(阶段Ⅱ)地震相沿地堑长轴方向,呈条带状展布;SQ9-SQ10时期(阶段Ⅲ)盆地内地震相均匀分布,各地堑统一连通。     

方正断陷北部古近系地层地震相特征研究

方正断陷是伊舒地堑主要油气勘探区之一,以地震、测井资料为基础,利用层序地层学研究方法,对方正断陷北部古近系地层进行了研究,选择了可信度较高的地震内部反射结构和外部几何形态,结合频率、振幅、连续性等参数,对地震相进行了划分。在研究区4个层序中共识别出席状平行亚平行地震相、楔形地震相、充填地震相、乱岗状地震相和前积地震相等多种地震反射类型。受构造和沉积影响,各种地震相在平面分布上具有差异性,在垂向演化上具有继承性。经过测井资料标定,将地震相转化为沉积相,划分出深湖—半深湖、滨浅湖、扇三角洲平原、扇三角洲前缘、浊积扇等沉积相,预测出了有利沉积相带。     

辽西凹陷欢喜岭地区沙河街组层序格架的建立

对辽西凹陷欢喜岭地区沙河街组进行了深入细致的层序划分以寻找岩性地层圈闭,由于地震反射特征在地震资料上表现不明显,层序界面识别困难,应用经典层序地层学的原理和方法,综合运用欢喜岭地区地震和测井资料,借助地震时频分析技术和测井连续小波变换来确定层序界面,建立了该区高精度层序地层格架。研究表明,地震时频分析技术和测井小波变换进行层序旋回划分是较为可靠和实用的。沙河街组共发育有5个具有等时意义的层序界面,可划分为6个三级层序。     

大民屯凹陷西部斜坡带勘探研究

以地震、测井和钻井等资料为基础,运用层序地层学、地震地层学及储层预测等技术手段针对大民屯凹陷前进构造带北段油气藏的形成条件、分布规律及研究方法等难题,开展了研究,根据地震反射特征、岩性组合、电性特征、沉积旋回识别出层序界面、初始湖泛面、最大湖泛面;根据地震相、单井相和剖面相研究,恢复了沉积体系,再结合储层反演综合研究,确定出低位体系域扇三角洲前缘水下分流河道及近岸浊积扇为油气勘探的有利区带,并取得了较好的勘探效果。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to