北部湾盆地乌石17-X油田流沙港组三段砂砾岩储层物性主控因素研究

乌石17-X油田位于北部湾盆地乌石凹陷东北侧,近物源沉积,沉积环境为扇三角洲沉积,储层岩性复杂,为砂砾岩储层,整体上物性较差,为中孔中、低渗储层,且孔渗相关性不明显。因此,分析储层物性特征及其影响因素是解决油气勘探的关键问题之一。通过铸体薄片、黏土矿物X线衍射、扫描电镜、常规压汞、全岩分析和常规物性等分析测试手段,结合岩心、井壁心观察,研究了乌石17-X油田流沙港组三段储层的岩石学特征、孔隙结构特征、成岩作用特征和物性特征,从微观角度分析了影响储层物性的主控因素。研究结果表明:岩性主要以含砾砂岩和砂砾岩为主,岩石类型主要为岩屑砂岩,成分成熟度中~极低,结构成熟度较低。研究区为中孔中、低渗储层,其中X1、X2和X3井区,位于扇三角洲外前缘水下分流河道,是研究区甜点发育区。影响储层物性的因素主要为成岩作用特征和孔隙结构特征。     

鄂尔多斯盆地南泥湾油田河庄坪区延长组储层特征

南泥湾油田河庄坪区为低孔低渗油田,查明该区储层特征对勘探、开发具有重要的理论和指导意义,通过露头观察、岩心室内分析试验等手段,对该区储层储层沉积相沉积微相特征、岩石学特征、储层孔隙类型、储层物性和成岩作用等进行研究,认为本区长4+5和长6储层为三角洲前缘沉积,砂体主要为水下分流河道砂体,主要为细粒长石砂岩,其中砂岩以浅灰色、灰色和浅灰绿色中细粒砂岩为主,分选较好,次棱角状,其成分成熟度和结构成熟度较高,本区主要储层长4+5、长6,其孔隙组合类型为溶蚀孔-剩余孔-微裂缝配套型,储层物性属低孔、低渗、小喉道为其特点,属低孔特低渗储层,碎屑岩的成岩变化,对碎屑岩储层的孔隙形成、保存及破坏起着极为重要的作用。碎屑岩储层及其储集性能既受沉积相的控制,又受到成岩作用的强烈影响。     

哈萨克斯坦North Nuraly油田侏罗系多尚组储层特征及有利储层预测研究

哈萨克斯坦North Nuraly油田侏罗系多尚组发育一套扇三角洲沉积,为典型的低孔低渗储层。通过扫描电镜、岩石薄片、压汞、X衍射分析等资料首次对研究区储层的岩矿特征、物性以及孔隙结构特征进行了详细研究。研究表明该区储层主要岩石类型为砂砾岩、砂岩、细砂岩,岩石成分成熟度中等、结构成熟度较低;黏土矿物含量高,主要为高岭石和伊利石,对储层伤害较大;其孔隙类型主要为剩余粒间孔,其次为无效的粒内溶孔。进一步研究储层压汞参数和物性特征发现该区储层可细分为Ⅰ、Ⅱ、Ⅲ类,沉积微相控制了其有利储层的展布。通过储层特征及沉积微相之间的关系,预测其有利储层分布范围。结果表明优质储层都集中在水下分流河道、河口砂坝等沉积微相中、较差的储层都集中在远砂坝及碎屑流、浊流砂体中。同时通过最新试油成果,验证了该区有利储层预测的可靠性和可行性,为该地区低孔低渗储层勘探开发提供了扎实的地质理论基础。     

长岭断陷白垩系储层发育特征和控制因素

长岭断陷白垩系发育碎屑岩和火成岩两类储层,其储层的物性特征存在差异。研究表明,油层主要分布在白垩系浅层扇三角洲平原相的砂岩储层中,气层主要分布在营城组及以下层位溢流相和爆发相的凝灰岩和流纹岩储层中。碎屑岩储层以砂岩为主,具有成分成熟度高、结构成熟度中等、岩屑和填隙物含量高等特点;储层物性较差,多数层段为低孔低渗储层。火成岩储层,岩性主要为溢流相和爆发相的流纹岩或凝灰岩,储集层孔隙度、渗透率非均质性较强,但裂隙较发育,由裂缝连通孔洞,成为较好的储集空间。影响两类储集层发育的主控因素主要为储层岩相和成岩作用。碎屑岩储层以扇三角洲平原相的砂砾岩为主,登娄库组压实作用相对较弱,孔隙相对发育;营城组和沙河子组压实作用较强,且次生孔隙发育弱,甚至不发育。火成岩储层岩性主要以爆发相的凝灰岩和溢流相的流纹岩为主,原生孔隙与裂缝发育,为冷却成岩和热液成岩共同作用的结果。     

文昌C油田珠海组二段退积型扇三角洲储层特征及物性影响因素分析

通过岩心观察、薄片鉴定、图像分析和扫描电镜等分析手段,对珠江口盆地文昌C油田退积型扇三角洲沉积储层特征和物性影响因素进行了深入研究。研究结果表明:研究区岩性较粗,成分主要以岩屑石英砂岩和长石石英砂岩为主,成分成熟度和结构成熟度为中等偏低。储层孔隙类型以原生粒间孔为主,少量溶蚀粒间孔和粒内溶蚀孔;孔隙连通性中等,喉道类型主要为片状/弯片状喉道和缩颈型喉道。储层物性上表现为中孔、中渗特征,且上部物性差,下部物性好。储层的物性主要受到沉积微相和沉积构造的影响;成岩作用中胶结作用是研究区储层物性差别的重要因素,胶结作用减孔量达17.2%;基准面旋回的变化是影响储层纵向差异的主要因素,受基准面上升变化的影响,从下往上泥质含量增加,孔隙度和渗透率减小。     

鄂尔多斯盆地姬塬地区延长组长8油层组储层特征及主控因素

通过研究区内大量岩心铸体薄片及物性资料分析,对姬塬地区长8段的沉积特征、岩石学特征、孔隙类型、微观孔隙结构特征及成岩作用进行研究,并分析影响储层物性的主要因素。研究后可知,研究区长8储层发育湖泊、三角洲沉积,三角洲前缘水下分流河道砂体是主要的储集体;岩石类型主要为细、中粒岩屑长石砂岩及长石岩屑砂岩,具有成分成熟度较低、结构成熟度一般的特点;粒间孔及长石溶孔是主要的储集空间,孔喉分布为偏小孔细喉型,且分选性差,非均质性强。砂岩孔隙度平均为9.448%,渗透率平均为0.685×10~(-3)μm~2,为特低渗储层。研究后认为,研究区储层特征主要受到沉积作用和成岩作用的影响,其中沉积相带在宏观上控制了储层的发育条件及分布;压实作用、胶结作用是造成孔隙度下降的重要原因,而溶蚀作用则改善了储层的物性。     

鄂尔多斯盆地直罗油田长2储层特征

鄂尔多斯盆地直罗油田长2储层主要沉积相为三角洲相沉积,水下分流河道为其主要的油气储集层,长2储层岩性主要为岩性以细-中粒长石砂岩为主,其次为细-粉粒长石砂岩,矿物成熟度低。主要储集空间为由溶蚀粒间孔、原生粒间孔和微孔隙组成的复合孔,以残余的溶蚀粒间孔为主,微孔隙少量。储层主要为中低孔、特低渗储层,非均质性较强。较强的压实作用、胶结作用是形成低孔低渗的主要因素,而溶蚀作用是储层物性改善的主要因素。     

柴达木盆地昆北油田路乐河组沉积相及储层特征

昆北油田位于柴达木盆地西南区的昆北断阶带,路乐河组是该油田重要的产油层系.通过对路乐河组的岩性、沉积构造、粒度、重矿物和测井相研究,认为路乐河组是一套退积型的辫状三角洲沉积,发育辫状三角洲平原、前缘亚相,微相类型包括(水下)分流河道、席状砂、河口坝、泛滥平原、分流间湾等;沉积相平面展布呈自南西向北东的扇形,平面上发育两期分支体系;储层岩性包括砾状砂岩、中粗砂岩及细砂岩等,储层成分成熟度中等,结构成熟度低,储集空间以原生粒间孔为主,见少量次生溶孔、成岩粒内缝;储层物性整体较好,属中低孔、中低渗型储层.压实作用是储层物性的主控因素,储集性能主要受沉积相带、杂基含量和成岩作用控制.     

安塞油田楼坪区长10致密储层成岩作用研究

综合应用铸体薄片、扫描电镜、X-衍射、恒速压汞等技术和储层综合评价方法,对安塞油田楼坪区长10致密储层成岩作用系统分析。结果表明:长10储层岩性以灰色细粒长石砂岩和岩屑长石砂岩为主;碎屑颗粒成分成熟度和结构成熟度都较低;孔隙类型主要以粒间孔、长石溶孔和浊沸石溶孔为主;喉道以细小孔-微细喉为主;储层属于典型的低孔-(超)低渗致密储层;长10储层主要成岩作用为压实-压溶作用、胶结作用以及溶蚀作用,其中压实作用、胶结作用属破坏性成岩作用,溶蚀作用属建设性成岩作用,长10储层砂岩目前处于中成岩A期;依据研究区沉积特征及成岩作用,将楼坪区成岩相划分为5种类型,其中绿泥石胶结相、绿泥石胶结-长石、浊沸石溶蚀相是主要的有利成岩相带。     

鄂尔多斯盆地姬塬地区三叠系延长组长2油层组储层特征及影响因素

通过岩心铸体薄片、粘土矿物X衍射、扫描电镜、物性分析等方法,分析了鄂尔多斯盆地姬塬地区长2储层的岩石学特征、物性特征以及孔隙结构特征.结果表明:研究区长2储层主要为长石砂岩、岩屑长石砂岩,填隙物以高岭石为主,具细粒结构,分选好,磨圆度中等.储集性能具有中孔、低渗的物性特点.孔隙类型主要为粒间孔、其次是长石溶孔.孔隙结构为中小孔、中细喉型.影响储层的主要因素为长2油层组的三角洲沉积背景以及压实、胶结、溶蚀等成岩作用.     

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.     

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

<正>~~     

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.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

An Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme     

WIMAX与WI-FI技术分析及联合组网

介绍了WiMAX与Wi-Fi两种无线宽带接入技术,并对两者之间的关系及相互之间的影响做了对比及分析,并对WiMAX的关键技术进行了详细说明,最后对两者的联合组网方式做了简单的探讨。