Caractérisation des variations lithologiques saisonnières des sédiments de la baie de Seine orientale ; impact des crues de la Seine (France)Characterisation of seasonal lithological variations of the superficial sediment in the eastern part of the Bay of Seine: impact of floods Seine River (France)     

Sébastien Garnaud  Patrick Lesueur  Sandric Lesourd  Nicole Poupinet  Jean-Claude Brun-Cottan 《Comptes Rendus Geoscience》2002,334(5):323-330

This paper presents the first results obtained during cruises since 1995 in the southeastern part of the Bay of Seine. New sedimentological data concerning sediment samples, box cores and water column measurements have been obtained recently in the framework of the Research Programme PNEC (French National Coastal Environment Programme). Fine sediments are deposited on form of temporary veneers of fluid-to-soft mud formed during high floods episodes. In the subtidal area (<10 m water depth), mobility of fine sediments is important and temporary mud deposited during high discharge period composes part of the distal estuarine system of the Seine River. To cite this article: S. Garnaud et al., C. R. Geoscience 334 (2002) 323–330.  相似文献   

浏阳永和海泡石在海洋钻井泥浆中的应用   总被引：1，自引：0，他引：1  

杨光华 《湖南地质》1997,16(3):205-208,204

该文介绍浏阳县永和镇海泡石的物化基本分析结果及海泡石粘土加工方法试验、机械分散试验、分散介质试验、造浆性能评价方法以及在南海油田进行实钻试验的情况，认为用永和海泡石开发钻井泥浆材料在技术上是可行的，有着很大的远景市场开发潜力。  相似文献   

淮南六方堤水力冲填周期的合理确定   总被引：1，自引：0，他引：1  

桂和荣  杨学明 《工程地质学报》1996,4(1):14-19

本文根据现场水力冲填试验成果, 利用分段泥浆压力法确定出一次冲填最大冲填高度, 在此基础上确定出最佳的冲填周期, 以便合理预算几十里长六方堤水力冲填加宽加高施工工期及投资。  相似文献   

页岩抑制剂──DSSAS的研制与应用          下载免费PDF全文

王永远  唐梦准 《探矿工程》1996,(5):37-38

ＤＳＳＡＳ是一种钻井液用的粉剂磺化石油沥青，较详细地叙述了ＤＳＳＡＳ的生产合成工艺，讨论了原料，生产工艺中各种参数及控制，还介绍了产品使用方法和现场应用实例。  相似文献   

含碳化钨硬相的镍基涂层泥浆泵缸套研究     

王成彪  吴晓光 《现代地质》1996,10(4):558-561

５＃钢泥浆泵缸套内工作表面，以碳化钨硬相镍基涂层进行真空熔烧强化处理，大幅度提高了缺套的耐磨料磨损性能。对涂层的显微组织结构及机械性能进行了试验分析，并给出了涂层缸套现场使用的试验结果  相似文献   

基于纵波地震和四分量地震的弹性波阻抗反演   总被引：3，自引：0，他引：3  

张树林  张志斌 《海洋地质与第四纪地质》2007,27(5):51-56

为了更好地揭示崖13-1气田的泥岩夹层及剩余气分布,提高采收率,尝试了基于纵波地震和四分量地震的弹性波阻抗反演。利用常规纵波地震资料对崖13-1气田气层进行了多角度同时反演;利用四分量地震资料进行了纵波和转换横波波阻抗反演。基于常规纵波地震资料的弹性波阻抗反演剖面的分辨率较高,气层纵波波阻抗与盖层的纵波波阻抗差异大于横波,但横波波阻抗分辨率比纵波波阻抗高,对气层细节反映得更清楚。利用弹性波阻抗反演结果可以较好地发现剩余气、泥岩夹层及气水界面。转换横波地震资料的分辨率较低,基于四分量地震资料的弹性波阻抗反演的分辨率也比较低。  相似文献   

Deep-sea Polymetallic Nodule Mining: Challenges Ahead for Technologists and Environmentalists     

Anil B. Valsangkar 《Marine Georesources & Geotechnology》2003,21(2):81-91

Although, offshore mining for mineral wealth is not required at present, it may be the only alternative in the future due to the continuous growing demand for certain metals that have no or limited land deposits. Risk involved in deep-sea mining is not less than that in space missions. Limited groups of mining engineers and environmental scientists are conducting studies that influence the development of mining systems and subsystems for collection, screening, lifting, and transportation of deep-sea minerals. Accepting this challenge more than 20 years ago, the National Institute of Oceanography, Goa, started surveys and exploration for polymetallic nodules in the Indian Ocean and was the first to receive "Pioneer Status" recognition from the United Nations. Experiments have also been conducted to study the potential impacts of deep-seabed mining.  相似文献   

长江河口疏浚土制成精细化工产品──蓝色颜料     

陈清泽  陈邦林 《海洋科学》1994,18(2):45-46

分析了长江口疏浚土的成分后，选取其有效成分。然后，配以其它原料如 炭粉等。经高温处理，可制得蓝色的颜料，并对颜料进行亲水亲油试验和电镜分析。  相似文献   

沉入式大圆筒结构码头工作机理离心模型试验研究   总被引：6，自引：0，他引：6  

徐光明  章为民等 《海洋工程》2001,19(1):38-44

沉入式大圆筒结构码头，由于筒体下部有一定长度嵌入港地泥面以下的地基土层中，因此，其工作机理不仅不同于其它挡土岸壁式码头，而且也有别于基床式大圆铜结构码头。本文介绍了用土工物理离心试验对这一结构形式码头工作机理所作的研究，就沉入式大圆的深高比、径高比和筒壁摩擦作用对工作性状影响规律进行了初步研究，另外还尝试测定了大圆筒侧壁土压力分布规律，并探讨了码头面沉降发展趋势特征。  相似文献   

Spatial variability of meiofaunal communities at areas of contrasting depth and productivity in the Aegean Sea (NE Mediterranean)     

N. Lampadariou  A. Tselepides 《Progress in Oceanography》2006,69(1):19-36

The abundance and community structure of metazoan meiofauna were studied in deep-sea sediments from the north and south Aegean Sea (Eastern Mediterranean) in summer 1997 and spring 1998. The two areas varied in their surface primary productivity with the northern area being more productive. Meiofaunal densities displayed strong spatial variability while no temporal changes were observed. Total metazoan density ranged from 128 to 1251 ind./10 cm², with significantly higher values in the north. Meiofaunal biomass ranged from 27 to 391 μgC/10 cm² with higher values also in the north. At all stations nematodes dominated the community, comprising on average more than 91% of the total abundance. On a broad scale, meiofaunal densities displayed a positive correlation with food availability (sediment-bound chloroplastic pigments, carbohydrates and lipids); carbon mineralization (an indicator of organic matter turnover) was significantly higher in the northern Aegean, providing evidence of high organic-matter input and intense benthic-pelagic coupling. The spatial structure of the nematode community indicated that the two areas were similar in terms of their dominant genera (Halalaimus, Acantholaimus, and Thalassomonhystera).  相似文献