孤岛油田储层微观结构特征及其对驱油效率的影响

利用岩石薄片、铸体薄片、扫描电镜和压汞资料 ,对孤岛油田馆上段储层微观结构进行了全面研究。馆上段的孔隙结构可以分为 4种类型 ,以Ⅱ ,Ⅲ类孔隙结构为主 ,微观非均质性严重。沉积环境和成岩作用是影响储层微观结构的主要地质因素 ,经过长期注水开发 ,在一定程度上改善了储层微观结构。储层孔喉分布和孔隙结构的非均质性是影响孤岛油田驱油效率的主要因素之一 ,岩石润湿性的分布不均匀是影响驱油效率的另一重要因素。     

孤岛油田储层微观结构特征及其对驱油效率的影响

利用岩石薄片、铸体薄片、扫描电镜和压汞资料，对孤岛油田馆上段储层微观结构进行了全面研究。馆上段的孔隙结构可以分为4种类型，以Ⅱ，Ⅲ类孔隙结构为主，微观非均质性严重。沉积环境和成岩作用是影响储层微观结构的主要地质因素，经过长期注水开发，在一定程度上改善了储层微观结构。储层孔喉分布和孔隙结构的非均质性是影响孤岛油田驱油效率的主要因素之一，岩石润湿性的分布不均匀是影响驱油效率的另一重要因素。     

埕岛油田馆上段储层非均质性研究

通过对我国第一个浅海-极浅海特大油田—埕岛油田馆上段储层层内韵律性、层间差异性、平面上砂体连续性、层间层内隔夹层的定量评价以及储层微观孔隙结构的研究,揭示了埕岛油田馆上段储层宏观、微观非均质特征,指出埕岛油田馆上段储层平面非均质性与微相带、砂体发育密切相关,并建立了埕岛油田馆上段储层四种类型的孔隙结构模式,对指导埕岛油田馆上段油藏进行各种开发调整有着重要的指导意义。     

张强凹陷沙海组碎屑岩储层的非均质性

据铸体薄片和扫描电镜观察，将张强凹陷沙海组碎屑岩储层的孔隙空间分为7种基本孔隙类型，这7类孔隙形成了孔隙型和致密型两种孔隙组合关系。研究发现：沙海组碎屑岩储层的孔隙分布和物理性质变化很大，微观非均质性较为严重；碎屑岩沉积组分的结构特征、机械压实作用、自生矿物胶结作用和不稳定组分溶解作用的不均一性，是导致张强凹陷沙海组储层孔隙结构非均质性的主要因素。     

蟠龙油田F110井区延长组储层微观非均质性模拟

通过真实砂岩微观孔隙模型实验.对储层内油、水两相流体的微观渗流机理进行模拟,以求更深层次地了解研究区延长组砂岩储层的微观非均质性及其对剩余油分布的影响.分析认为,研究区延长组储层的微观非均质性很强,且存在储层物性越好,其微观非均质性越强的特点,成岩作用和孔隙结构是影响微观非均质性的主要因素.实验表明,微观非均质性是影响水驱油效果和剩余油形成的内因.在充分认识研究区延长组砂岩储层4种主要孔隙类型的基础上,根据实验结果,建议相应地制定3类注水开发方案,剩余原生粒间孔隙型和次生溶蚀孔隙型归为一类,微裂缝型一类,自生矿物晶间微孔隙型一类.     

鄂尔多斯盆地合水地区长8储层微观非均质性的试验分析

通过真实砂岩微观孔隙模型试验,对鄂尔多斯盆地合水地区长8储层的微观非均质性进行研究.结果表明:研究区长8储层的微观非均质性很强,且存在储层物性越好其微观非均质性越强的特点;沉积微相和溶蚀作用是影响微观非均质性的主要因素;微观非均质性是影响水驱油效果和剩余油分布的内因;在充分研究合水地区长8储层4种主要孔隙类型的基础上,建议相应地针对原生粒间孔隙和溶蚀孔隙型、微裂缝型、自生矿物晶间微孔隙型制定3类注水开发方案.     

乐安油田草13断块沙四段储集层微观特征及其与驱油效率的关系

利用岩石物性分析、薄片、铸体薄片、扫描电镜和压汞资料，对乐安油田草13断块沙四段储层及其微观结构进行了研究。结果表明，研究区沙四段储层岩性混杂、岩石疏松，属中偏低渗储层。其储层孔隙类型有原生粒间孔隙、晶间微孔隙和溶蚀孔隙，孔隙结构以中孔细喉类型为主；孔隙和喉道分布区间宽，孔喉参数变化范围大，分选和均质程度低，孔喉比偏大，孔隙结构的非均质性较强。利用相关分析法进行的定量分析结果表明，沙四段储层退汞效率与各孔隙结构参数之间存在正相关关系，其中随孔隙度、渗透率增大，退汞效率迅速增加；而随孔喉增大，退汞效率缓慢增加．喉道分选性与驱油效率虽也呈正相关，但相关性较差。总体上，研究区沙四段储层驱油效率随储集物性的变好而增加。     

乐安油田草13断块沙四段储集层微观特征及其与驱油效率的关系

利用岩石物性分析、薄片、铸体薄片、扫描电镜和压汞资料,对乐安油田草13断块沙四段储层及其微观结构进行了研究。结果表明,研究区沙四段储层岩性混杂、岩石疏松,属中偏低渗储层。其储层孔隙类型有原生粒间孔隙、晶间微孔隙和溶蚀孔隙,孔隙结构以中孔细喉类型为主;孔隙和喉道分布区间宽,孔喉参数变化范围大,分选和均质程度低,孔喉比偏大,孔隙结构的非均质性较强。利用相关分析法进行的定量分析结果表明,沙四段储层退汞效率与各孔隙结构参数之间存在正相关关系,其中随孔隙度、渗透率增大,退汞效率迅速增加;而随孔喉增大,退汞效率缓慢增加,喉道分选性与驱油效率虽也呈正相关,但相关性较差。总体上,研究区沙四段储层驱油效率随储集物性的变好而增加。     

杏北区长6储层非均质性对含油性分布的影响

目的 评价安塞油田杏北区长6储层的宏观、微观非均质性,分析各类非均质性对含油分布的控制作用.方法 在储层沉积微相研究的基础上,综合运用岩心观察、薄片分析、压汞等各类测试、测井资料进行研究.结果 研究区储层砂体的平面连续性及物性状况是控制储层含油性的重要因素;储层在纵向上粒度韵律性、渗透率非均质对含油性在纵向上分布起到一定的控制作用:粒度较粗、物性较好的部位往往含油性较好;隔夹层越薄,分布范围越小,油气越容易发生垂向运移,对油气在纵向上的分布也起重要影响;储层孔隙结构的微观非均质性控制着油气进入储层的饱满程度.结论 研究区长6储层非均质性主要通过砂体平面展布、层内岩性和物性差异以及隔层分布等因素影响储层含油性分布.对该研究区储层非均质性与合油性分布关系的系统研究,对于评价油藏、预测有利含油区带并制定合理的开发方案有指导意义.     

金湖凹陷西园地区阜宁组二段储层的微观特征

对金湖凹阜宁组二段的岩石成分，岩石物性，成岩作用，孔隙结构，粘土矿物的潜在敏感性等特征进行了研究，揭示了储层的微观非均质性，研究表明，储层的成岩特点以泥质和碳酸盐胶结作用为主，成岩阶段为早成岩期Ｂ亚期向晚成岩Ａ亚期过渡，储层孔隙类型以原生粒间孔为主，孔隙结构以小孔细喉结构为主，储层微观非均质性强。     

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