准噶尔盆地阜东斜坡区侏罗系地震相研究

对准噶尔盆地阜东斜坡区侏罗系地层进行了研究 ,选择了可信度较高的地震反射内部结构和外部形态 ,辅助地震反射振幅、连续性等参数 ,对地震相进行了划分命名。在研究区 6个地震层序中共识别出平行席状地震相、亚平行席状地震相、前积地震相、亚平行波状乱岗状地震相、透镜状地震相、充填地震相及楔状地震相等多种地震相类型。这些地震相在平面分布上具有差异性 ,而在垂向演化上具有继承性和新生性     

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.     

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。     

珠江口盆地开平凹陷恩平组地震反射特征与沉积体系展布

开平凹陷位于珠江口盆地西南部,在古近纪为一NE-ENE向展布的断陷盆地。在地震反射特征识别恩平组沉积界面的基础上,依据地震反射结构和井-震标定在恩平组识别出5种沉积相类型。浅湖亚相表现为中频率、强振幅、连续平行席状地震相,分布于凹陷中心;滨湖亚相表现为中高频、中连续、亚平行席状地震相和中频率、中弱振幅、中连续上超地震相和中高频、弱振幅、中连续微波状地震相,主要分布于凹陷南部;三角洲相表现为高频率、变振幅、中连续前积地震相和中高频、中弱振幅、中等连续、弱前积地震相,主要发育于凹陷东部和东北部;扇三角洲相表现为低频、弱振幅、断续杂乱楔形地震相,主要分布于凹陷西部控凹断层下降盘;冲积扇相表现为低频、弱振幅、断续杂乱充填地震相,局限于西部控凹断层的上升盘。     

川东北下沙溪庙组地震相分析研究

川东北地区的油气资源丰富,具有很好的勘探潜力。运用二维地震资料划分地震层序,对川东北下沙溪庙组的地震相进行分析研究,划出区域和储层两大类。区域地震相主要有较连续平行反射地震相、变振幅断续亚平行地震相和强弱变振幅不连续波状反射地震相3种,储层地震相主要有前积地震相和下切充填地震相。编制了下沙溪庙组地震相平面分布图,并对区内地震相的分布规律和演化进行了分析。     

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。     

Tanganyika盆地南部地震相识别及沉积演化分析

东非裂谷系盆地近年来不断取得油气发现,Tanganyika盆地与已发现含油气盆地构造及沉积特征相似,具有较大的勘探潜力。本次研究根据地震反射界面接触关系及界面上下地震反射特征,识别出4个层序界面：T14、T12、T5、T2,相应地将盆地沉积地层划分为4个三级层序：SQ1-SQ4。在层序格架控制下,根据地震相外部反射形态及内部反射结构,识别出河道充填状、强振幅席状、弱振幅席状、楔状、透镜状、丘状、叠瓦状共7种地震相类型,反映河流、滨浅湖-深湖、深水等深流、扇三角洲等不同沉积体系。结果表明研究区SQ1层序时期,缓坡带孤立半地堑发育三角洲沉积,洼陷中心以滨浅湖-深湖相沉积为主;SQ2层序时期缓坡带作为统一的构造单元发育河流及三角洲沉积,洼陷中心以发育三角洲及浊流相沉积为特征;SQ3层序时期构造抬升,缓坡带发育大型曲流河沉积,洼陷中心三角洲及浊流沉积规模进一步扩大;SQ4层序时期裂陷进一步加剧,洼陷中心发育洼陷中心发育深水等深流沉积,边界断层陡坡带发育大规模扇三角洲及滑塌沉积。     

深水朵体沉积构型及其油气勘探意义

基于地震、测井、岩心及露头等资料,研究了深水朵体的外部形态、内部结构、物理性质及成因。取得3个方面的认识:①深水朵体受陆坡地形及物源供给的影响,发育单一朵体和多级朵体。受沉积厚度、岩性及地震分辨率的影响,孟加拉湾和尼日尔三角洲发育的朵体在地震上呈强振幅丘状反射,内部见分支水道或底超现象;白云凹陷发育的朵体在地震上呈强振幅平行亚平行反射。②深水朵体可划分为小层和层组、朵体单元、朵体以及朵体复合体4个级次。③深水朵体可进一步划分为近端朵体和远端朵体,近端朵体由分支水道复合席状砂组成,叠置的朵体单元构成的远端朵体主要由层状席状砂组成。     

川东南地区茅口组地震相分析

针对勘探程度不高、钻井分布不均且以二维地震资料为主的川东南地区,通过对茅口组地震相分析,发现了中高频席状地震相、中低频席状地震相、前积地震相、丘状地震相、波状地震相等多种类型.通过单井相分析和井旁地震响应模式的建立,结合区域地质背景分析并以沉积模式为指导开展了沉积相展布特征研究.认为茅口组沉积时期研究区在开阔台地相的整...     

二连盆地白北凹陷白垩系下统地震相特征

为使用地震相特征解译沉积分布规律,寻找优质储层。文章通过对地震剖面振幅、连续性、同相轴特征的研究分析,将白垩系下统地震相分为：①中弱振幅低连续性楔形充填;②中弱振幅中连续性楔形充填;③中振幅中高连续性楔形充填;④杂乱反射充填;⑤强振幅中高连续性席状充填;⑥中振幅中连续性席状充填等六种反射构型,并给出相应的识别标志、平面分布范围。分析认为中弱振幅低连续性楔形充填多发育在西部次洼周缘及南部斜坡带;中弱振幅中连续性楔形充填呈北西-南东向展布;中振幅中高连续性楔形充填由盆地边缘向内部延伸;杂乱反射充填处于紧邻断裂带下降盘一侧;强振幅中高连续性席状充填分布于凹陷湖盆中心区域;中振幅中连续性席状充填主要分布于湖盆中心区域,展布面积相对于强振幅中高连续性席状充填更大。     

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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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.     

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。     

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