四川盆地中西部上三叠统沉积相

四川盆地中西部上三叠统沉积背景有利于特大型深盆气藏的形成 ,其沉积相带的圈定是深盆气有利区带评价的基础 .通过岩心描述和分析 ,并结合地震相、砂体结构及分布特征 ,对四川盆地中西部上三叠统沉积相进行了分析 .研究区沉积相可划分为河流三角洲、海湾、湖泊和冲积扇等 4种类型 ,其中三角洲是研究区的主要骨架砂体 .在前人工作的基础上 ,依据沉积物源、砂体发育特征及其相标志特征 ,对上三叠统须家河期须一须三亚期和香溪期香二香六亚期的沉积相展布特征进行了研究 ,对上三叠统各期沉积演化特征进行了综合表征 .分析结果表明 ,四川盆地中西部上三叠统具有深盆气生成、运移和聚集的岩相古地理基础 .     

羌塘盆地查郎拉地区中新生界沉积相研究

油气的生成与聚集和沉积相有极为密切的关系,为评价羌塘盆地查郎拉地区中新生界含油气前景,在野外遥感调研的基础上,系统研究了该地区中新生界的沉积环境。其岩生类型主要为碎屑岩和碳酸盐岩两大类。划分出浅海相、碳酸盐台地相、滨岸相、三角洲相、河口湾湘、河流相、冲积扇相七个大相、１８个亚相和若干微相,各时代地层的沉积相表现为：①晚三叠世以大面积海陆过渡相占主导地位,总体形成海退沉积旋回;②中侏罗世浅海相沉积较     

羌塘盆地查郎拉地区中新生界沉积相研究

油气的生成与聚集和沉积相有极为密切的关系,为评价羌塘盆地查郎拉地区中新生界含油气前景,在野外遥感调研的基础上,系统研究了该地区中新生界的沉积环境．其岩石类型主要为碎屑岩和碳酸盐岩两大类．划分出浅海相、碳酸盐台地相、滨岸相、三角洲相、河口湾相、河流相、冲积扇相七个大相、１８ 个亚相和若干微相,各时代地层的沉积相表现为：①晚三叠世以大面积海陆过渡相占主导地位,总体形成海退沉积旋回;②中侏罗世浅海相沉积较发育,晚侏罗世以海陆过渡相沉积为主;③白垩纪岩相古地理存在早晚差异,早期为残留海背景下的局限碳酸盐台地沉积,晚期为山麓冲积扇沉积．     

塔里木盆地阿克库勒地区三叠系中油组沉积相研究

通过岩心观察、岩矿以及粒度等化验资料综合分析,确定阿克库勒地区三叠系中油组主要沉积相包括辫状河流相、湖泊相、湖底扇相以及三角洲相.中油组主砂体主要为辫状河流相和湖底扇相沉积,其中,湖底扇相属研究区内首次发现.湖底扇相可划分出扇中和扇缘2个亚相,辫状水道是扇中的主要微相,天然堤微相不发育.湖泊相发育滨浅湖和半深湖-深湖亚相.三角洲相分布在中油组主砂体上部的砂泥岩段中,由于上油组地层对中油组上部砂泥岩段的侵蚀作用较强烈,仅部分井残留三角洲沉积,所以三角洲不能构成研究区的有利储层.由北向南,中油组的沉积相平面组合为:辫状河流相—斜坡滨浅湖—半深湖(下切水道)—湖底扇相—深湖亚相.     

四川盆地中西部上三叠统沉积相

四川盆地中西部上三叠统沉积背景有利于特大型深盆气藏的形式,其沉积相带的圈定是深盆气有利区带评价的基础。通过岩心描述和分析,并结合地震相、砂体结构及分布特征,对四川盆地中西部上三叠统沉积相进行了分析。研究区沉积相可划分为河流三角洲、海湾、湖泊和冲积扇等４种类型,其中三角洲是研究区的主要骨架砂体。在前人工作的基础上,依据沉积物源、砂体发育特征及其相标志特征,对上三叠统须家河期须一～须三亚期和香溪期香二     

靖边-安塞地区延长组长1段沉积相特征

目的探讨鄂尔多斯盆地靖边—安塞地区三叠系延长组长1段的沉积相特征及展布。方法根据野外考察资料,利用地层对比及测井相分析方法,划分了靖边—安塞地区长1段沉积相类型。结果靖边—安塞地区晚三叠世末期为湖泊—三角洲沉积环境,沉积中心在子长地区;沉积相自下至上依次为三角洲平原、三角洲前缘和前三角洲—深湖;沉积序列自下至上以粒度由粗到细的正旋回为主。结论长1期湖盆的演化受鄂尔多斯盆地中部东西向构造带控制,该湖盆中的湖相暗色泥岩有可能成为子长等地区另一套重要的烃源岩。     

基于地震相研究的三水盆地布心组沉积相再解释

通过对广东三水盆地中北部始新统布心组地震剖面反射特征分析,确定其地震相类型及平面展布特征,结合钻井资料及前人研究成果对布心组进行沉积相再解释。研究表明:布心组沉积期由盆地周缘的高能地震相向盆地逐渐转变为较稳定的低能相,但盆地中部存在指示沉积环境水动力较强的地震相,说明其沉积相展布与前人以布心组为一个Ⅲ级层序划分出的滨湖-浅湖-半深湖-深湖相带分布不甚相同。三水盆地布心组沉积期滨-浅湖相发育于盆地大部,中部发育湖底扇,周缘多发育湖泊三角洲相,随时间的推移湖盆存在扩张后又收缩变浅的过程。     

大同盆地云岗组石窟段河流相沉积特征

大同盆地云岗组分布于大同云岗盆地、宁武静乐盆地、沁水盆地北部等地区.其命名地点在山西大同市云岗镇,其中石窟段为云岗组中段.经前人研究发现,大同盆地云岗组为辫状河沉积.通过对研究区野外露头中三条典型剖面的研究,全面分析了石窟段河流相沉积特征,并完成了如下工作:①制作了研究区野外露头中三条典型剖面的素描图并建立了界面划分方案;②在界面划分的基础上进行各单元内部岩相、沉积构造及沉积特征的分析;③综合各单元的沉积特征,并通过剖面之间的横向对比,明确了研究区各期次河流相沉积之间时间与空间上的联系;④明确了研究区河流相沉积模式并建立了相应沉积相模式概图.上述工作完成后,从研究区沉积模式概图可见古河流大致沿着自北向南的方向由北部山间汇入大同盆地,形成辫状河道沉积.沉积相总体按照自西向东的方向呈现出泛滥平原—河道沉积—泛滥平原的变化趋势.研究成果为大同盆地侏罗纪的进一步研究及未来大同地区的煤矿开采工作提供资料基础.     

湖泊相介壳滩分布的地震预测方法研究——以元坝地区大安寨段为例

地震沉积学自进入我国以来,在沉积相的预测中得到了广泛应用,但多数研究为河流相地震沉积学特征研究。目前尚缺少对湖泊相地震沉积学研究。元坝地区大安寨段为滨湖-浅湖-半深至深湖沉积。其中介壳灰岩为该地区主要的油气产层。在沉积学和地震沉积的指导下,划分了元坝地区大安寨段各亚相分布范围,通过地震正演及切片技术对浅湖介壳滩微相的分布进行了预测。     

赣中西部上三叠统沉积相探讨

经对赣中西部地区晚三叠世沉积特征及安源煤系沉积相归属问题的分析和讨论,认为研究区的沉积环境为半咸水的陆缘近海湖环境,并可进一步划分出五种亚相,即半深湖亚相、浅湖亚相、滨湖潮坪亚相、湖泊三角洲亚相和水下冲积扇亚相,对各亚相特征进行了系统地描述。     

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.     

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.     

A computer generator for randomly layered structures

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

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     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.