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惠民凹陷田家地区沙二上亚段主要发育三角洲平原亚相和三角洲前缘亚相。根据岩心、测井、地震等资料,将三角洲平原细分为分流河道、河道边缘和洪泛平原微相,三角洲前缘细分为水下分流河道、河口坝、远砂坝、前缘席状砂和水下分流间湾微相,并系统地总结出不同沉积微相的沉积特征,描绘出沉积微相带及其骨架砂体的平面展布。结合实钻井资料分析表明,该区河口坝和水下分流河道是勘探的有利相带。 相似文献
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本文以岩心和测井分析资料为基础,通过对安塞油田坪桥地区长6油层组的泥岩颜色、岩性特征、粒度分布、沉积构造、生物化石及测井相分析的研究,确认该工区长6油层组为三角洲前缘亚相沉积,将其进一步划分为水下分流河道、河口坝、河道侧翼、分流间湾、水下天然堤、前缘席状砂6个微相。其中,水下分流河道、河口坝、前缘席状砂等砂体都是油气聚集的有利地区。根据岩石学特征、沉积微相类型及特征,在综合考虑宏观沉积背景的基础上,建立了坪桥地区长6油层组不同时期的三角洲前缘亚相沉积模式,分别为指状砂体模式、朵状砂体模式、坨状砂体模式三种,为储层有利储集相带预测奠定了基础。 相似文献
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长岭坳陷腰英台地区在青一段和青二段沉积时期处于三角洲前缘沉积环境,以西南方向为主的三角洲前缘砂体分支河道经本区延伸到湖盆中心,砂体的厚度较薄,自西南向北东方向有减薄趋势,甚至尖灭,研究区青一段、青二段沉积时期主要发育水下分流河道、水下分流河道侧缘、河口坝、水下分流间湾等沉积微相,其中水下分流河道、河口坝是最有利的储层发育区,也为油气聚集提供良好的储集空间。青一段、青二段时期沉积微相研究表明不同沉积时期主河道发生变迁,物源方向西移,不同砂组平面上物源和水道明显具有一定的迁移性。 相似文献
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辽河油田东营组为滨浅湖沉积环境,属于鸟足状三角洲沉积模式。依据沉积标志将三角洲前缘亚相划分为水下分流河道、河口砂坝、水下分流间三种沉积微相类型,本文对不同相带储层物性、孔隙结构及相带与油层出砂关系进行了研究。认为东营组沉积微相决定了储层的物性和孔隙结构,进而决定了不同相带油层的出砂规律,其中河道间砂出砂最重,累计出砂与时间呈乘幂关系;其次是河口砂坝,累计出砂与时间呈线性关系;水下分流河道出砂最少,水洗5～10年后,累计出砂量与时间呈对数关系。 相似文献
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根据岩心、测井、录井等资料,对高邮凹陷真武-曹庄地区戴一段的沉积相类型、展布特征等进行研究。通过沉积构造和沉积序列等方面的特征说明本区发育河流和湖泊共同作用下形成的三角洲体系沉积体系,包括三角洲平原、三角洲前缘、前三角洲泥三个亚相,有利油气储集的沉积微相类型包括分流河道、水下分流河道、河口坝等。根据分流河道砂体的分布形态,将三角洲的主要骨架砂体的水下分流河道砂体分为条带型和网状型。总结并提出了三角洲沉积体系模式,沉积微相分布受控于基准面旋回及其在旋回中的位置,网状型沉积微相分布模式发育于基准面下降到最低点,而条带型沉积微相分布模式发育于基准面上升降段。 相似文献
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针对HLQ油田下干柴沟组含油砂体厚度薄、横向变化快,井间产能差异较大,油层分布规律不清晰的问题,应用高分辨率层序地层学理论,建立研究区目的层的高精度层序地层对比格架,并在此基础上,进行各小层的沉积相分析,总结沉积体的演化规律,指导后续的勘探开发。研究区主要储层砂体沉积类型为为辫状河三角洲前缘水下分流河道、河口坝、席状砂和远砂坝。不同类型的砂体由于其形成环境不同,其物性和分布有较大差异。沉积微相明显地控制着储层的物性和平面展布。从整个层系看前缘水下分流河道微相始终控制着剩余油储量,为挖潜的重点目标。 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
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Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献