扇三角洲前缘沉积相及其对单井产能影响分析——以玛湖坳陷玛18井区百口泉组为例

玛18井区三叠系百口泉组是水平井重要的勘探开发层位,利用岩心、测井和地震等资料,在精细认识沉积微相的基础上,分析了沉积相演化特征,并尝试探讨不同沉积微相对水平井产能的影响.研究结果表明:在湖侵退积的沉积环境背景下,研究区主要发育扇三角洲前缘水下分流河道、分流间溢岸砂、远砂坝以及泥岩等沉积微相.水下分流河道砂体是主要储集空间,百口泉组沉积时期河道砂体具有强烈进积—加积到弱进积—加积再到退积的沉积演变过程.沉积微相对水平井产能有较大的影响,水下分流河道沉积微相砂体储层的产能明显较高,厚层分流间溢岸砂次之.研究为后期水平井部署及有针对性的射孔开发提供了参考.     

双河油区延长组长6油层组沉积相研究

通过对双河油区内岩心的岩石相特征、沉积构造、录井资料以及电测曲线的综合认识,结合地层划分,对该区块长6油层组的沉积相类型以及砂体展布特征进行了系统的研究.认为长6油层组为三角洲前缘沉积,由水下分流河道、分流间湾、河口砂坝、远砂坝等微相构成,骨架砂体为水下分流河道、河口砂坝、远砂坝中的砂质沉积.并确定了长6油层组主力小层沉积微相的平面展布,为储层有利区块预测奠定了基础.     

鄂尔多斯盆地罗庞塬40073井区长4+5油层组沉积相研究

通过芯井观察和岩屑钻井资料的分析研究,结合沉积相的测井响应特征,采取先单井划分后多井沉积相对比的方法,对鄂尔多斯盆地罗庞塬40073井区长4+5油层组的沉积相、沉积微相进行了划分,得到了该井区油层组沉积相在平面上的展布特征。结果表明:该沉积相可进一步划分为水下分流河道、分流间湾、水下天然堤、水下决口扇和河口坝等5种沉积微相;研究区油气的聚集受沉积微相的控制,长4+5油层组油气聚集的有利场所是水下分流河道及河口坝微相。     

姬塬油田西部延长组长6段沉积特征及沉积模式

为明确姬塬油田西部长6段沉积微相类型及其演化规律,综合利用岩心、测井、分析测试等基础资料,分析长6段岩性、沉积构造、粒度及测井相标志等,系统地对长6段沉积相类型及平面展布规律进行研究,在此基础上,建立了长6段沉积演化模式,并分析了沉积微相对储层的影响。结果表明:姬塬油田西部长6沉积时期湖盆萎缩,水体变浅,发育三角洲前缘亚相,包括水下分流河道、水下天然堤和支流间湾微相,水下分流河道是主干微相。水下分流河道呈北西—南东向条带状展布,砂体展布范围逐渐增大。长6_2和长6_1时期,河道砂体厚,平面连片分布,垂向相互叠置,物性好,易发生建设性成岩作用,是优质砂体分布的主要层位,也是下一步重点勘探层位。     

莫北凸起勘探新区——M116井区三工河组二段沉积相与有利砂体预测

位于莫北凸起的M116井区块,目前是莫北油田新的油气勘探区块,前人对其地质研究很少。通过岩心观察、粒度分析,结合测、录井资料,认为其三工河组二段发育辫状河三角洲相;并识别出辫状河三角洲前缘和前辫状河三角洲2个亚相,以及水下分流河道、支流间湾等5个微相。通过编绘单井沉积相柱状图及各小层沉积微相平面展布图,揭示了三工河组二段沉积相的纵向演化规律。认为在该时期,经历了基准面"降-升-再降-再升"的多期旋回变化,形成了两套"进积-退积"式的沉积组合;并描述各沉积微相在各小层沉积时期的平面展布形态及延伸距离。根据砂体物性统计,结合沉积微相分析及含油性观察等,认为水下分流河道砂体是研究区最有利的储集砂体,河口砂坝次之,远砂坝为非有利砂体。有利砂体的识别及其各时期平面分布范围的确定,为新区目的层开展后续油气开发提供了新的、重要的地质信息。     

鄂尔多斯盆地甘谷驿油田唐157井区长6油层组沉积相研究

结合鄂尔多斯盆地晚三叠世延长期区域沉积背景,以岩心、薄片、测井资料等为基础,通过对岩石类型、成分及颜色、粒度分布、沉积构造、测井相等沉积相标志进行分析,研究了甘谷驿油田唐157井区长6油层组沉积相类型及沉积微相平面展布特征。结果表明,该区长6油层组位于三角洲前缘亚相,而不是三角洲平原亚相,主要分为水下分流河道及其侧缘、水下天然堤、分流间湾、残余河口坝、前缘席状砂等微相类型。其中水下分流河道对油气的聚集起主导作用。在三角洲前缘建设期的长61、长62、长63砂体巨厚,平面连通性较好,是主要油层发育段。     

南泥湾长6油层组沉积微相及含油性研究

目的研究南泥湾地区长6油层组沉积微相,认识沉积微相与油气富集规律的关系。方法通过岩心观察、薄片观察、扫描电镜、粒度分析,结合钻井、测井资料,对南泥湾油田长6油层组岩性特征、沉积相特征及沉积微相含油性进行统计分析。结果该区长6为三角洲前缘亚相沉积,包括水下分流河道、河口砂坝、水下分流间湾、前缘席状砂、水下天然堤和水下决口扇等6种沉积微相,其平面展布由北向南呈鸟足状。结论水下分流河道微相是该区长6油层组含油砂体的骨架相,水下分流河道砂体是该区今后勘探的主要目标。     

高集油田高6断块E1f1-E1f2沉积相研究

以取心井单井相标志的精细研究为基础,结合区域地质背景、沉积特征等,确定高集油田高6断块阜宁组一段(E1f1)-阜宁组二段(E1f2)分别为一套三角洲前缘和滨浅湖亚相沉积:三角洲前缘中发育的微相类型包括水下分流河道、河口坝、远砂坝、间湾、席状砂,滨浅湖中则识别出滨浅湖砂坝、滨浅湖滩砂、灰岩、浅湖泥4种沉积微相。对沉积微相平、剖面展布特征进行研究,研究发现:垂向上不同砂组在区内沉积相展布具有一定的时空演化规律;水下分流河道、河口坝、生物灰岩及滨浅湖砂坝微相是油气的富集区和剩余油挖潜的最有利部位。     

华池油田长3油层沉积微相与含油性关系

对华 1 5 2井区沉积微相与含油性进行了较全面的分析 ,认为华 1 5 2井区长 3油层的沉积相为吴旗—华池三角洲前缘亚相的一个分支 .根据其岩性、电性及沉积构造特征 ,将其划分为 4个沉积单元 .每个单元又划分为水下分流河道、河口坝、天然堤、分流间洼地、分流间湾 5个沉积微相 ,每个沉积微相都有其独特的特点和沉积空间展布规律 .分析这些特征和规律 ,展示出华 1 5 2区长 3砂层是由水下分流河道砂体、河口坝砂体等多个微相叠合而成的复杂叠合体 ,从而构成典型的建设型鸟足状三角洲前缘砂体 .这一砂体的特征是鄂尔多斯盆地延长组上部储层的典型代表 ,也是形成油藏的主要砂体     

洛带气田遂宁组Jsn_1~2砂体展布及连通性

四川洛带气田遂宁组储层有利的沉积微相为三角洲前缘水下分流河道与河口坝,由于水下分流河道频繁改道、迁移和废弃,其储层横向变化快,对比难度大,制约了对沉积相带、储层分布等问题的认识。弄清砂体连通性对指导进一步开发有着重要作用。利用地震剖面资料识别的精细砂层组,结合井的测井曲线特征解释,根据井震一致原则,分析描述遂宁组Jsn12组的砂体连通性及展布情况。洛带气田遂宁组Jsn12组有两条明显的水下分流河道,东部为浅湖亚相,其中有席状砂、远砂坝微相,西部为水下分流河道,为河口砂坝、远砂坝微相。     

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…     

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).     

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.     

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.