低渗油藏采收率确定新方法     

黄小亮  ;唐海  ;吕栋梁  ;李仲  ;吕浙江  ;余贝贝 《海洋地质译丛》2008,(3):74-77

通过对油藏相渗曲线的归一化处理，利用达西定律理论，建立采油指数与含水率的关系；再通过油藏确定的单井经济极限采油量和油藏极限生产压差求出极限采油指数，从而得到极限含水率；最后以最终水驱体积波及系数与储层退汞效率计算出采收率。并以低渗透油藏为实例验证了该方法的正确与适用性，说明该方法对油田开发中确定低渗油藏采收率具有科学的指导意义。  相似文献   

2006年9月南海北部表层温盐场的走航观测   总被引：1，自引：0，他引：1  

孙振宇  胡建宇  毛华斌 《热带海洋学报》2008,27(1):6-10

通过2006年9月南海北部开放航次的走航观测,得到了该海区多个断面的表层温度、盐度分布曲线.QuikScat海面风场资料显示观测期间处于西南季风向东北季风的转换阶段,走航观测所得的温、盐资料显示出在这一季风转换的特殊阶段该海区表层的水文特征.珠江口冲淡水的扩散范围在季风转向前后有显著的变化,低盐的冲淡水在西南季风阶段向珠江口外海区的东南方延伸较远,而在东北季风阶段则受珠江径流量、南海北部表层环流等因素的影响收缩至珠江口附近.闽南近岸和台湾浅滩南部表层具有低温高盐特征,但CTD资料表明台湾浅滩区域存在上升流,结合风场资料,可证实观测期间此处的上升流由海流-地形因素所造成.  相似文献   

Review of recent findings on the water masses and circulation in the East Sea (Sea of Japan)   总被引：1，自引：0，他引：1  

Kuh Kim  Kyung-Il Chang  Dong-Jin Kang  Young Ho Kim  Jae-Hak Lee 《Journal of Oceanography》2008,64(5):721-735

Recent findings on water masses, biogeochemical tracers, deep currents and basin-scale circulation in the East/Japan Sea, and numerical modeling of its circulation are reviewed. Warming continues up to 2007 despite an episode of bottom water formation in the winter of 2000–2001. Water masses have definitely changed since the 1970s and further changes are expected due to the continuation of warming. Accumulation of current data in deep waters of the East/Japan Sea reveals that the circulation in the East/Japan Sea is primarily cyclonic with sub-basin scale cyclonic and anticyclonic cells in the Ulleung Basin (Tsushima Basin). Our understanding of the circulation of intermediate water masses has been deepened through high-resolution numerical studies, and the implementation of data assimilation has had initial success. However, the East/Japan Sea is unique in terms of the fine vertical structures of physical and biogeochemical properties of cold water mass measured at the highest precision and their rapid change with the global warming, so that full understanding of the structures and their change requires in-depth process studies with continuous monitoring programs.  相似文献   

Stability of an immersed tunnel in offshore conditions under deep water wave impact     

T. Kasper  J.S. Steenfelt  L.M. Pedersen  P.G. Jackson  R.W.M.G. Heijmans 《Coastal Engineering》2008

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对黄土地区钻孔和探井试样试验指标的分析评价     

高喜政  盛根来 《山东国土资源》2008,24(10)

通过对济南地区次生黄土所采集的钻孔和探井土样进行浸水试验，并对其主要物理力学指标进行了分析评价，得出探井试样比钻孔试样所具有的试验指标更为真实可靠，因此次生黄土分布区采集探井试样进行湿陷性浸水试验是十分必要的。  相似文献   

济南张夏组灰岩岩溶地下水供水潜力探讨   总被引：1，自引：1，他引：0       下载免费PDF全文

韩祥银  韩亮  付春升  方庆海  王集宁  刘广哲 《山东国土资源》2008,24(12)

济南南部广布巨厚张夏组灰岩,其中赋存优质丰富的岩溶地下水。出露众多泉水,其流量为800～8000m3/d。该文通过简述济南地区张夏组灰岩岩溶地下水的赋存条件与水文地质特征,概略计算与评价其资源量,论证开发利用这一新水源的可行性,以期为济南供水与保泉开辟新途径。  相似文献   

Changes in stream water quality due to logging of the boreal forest in the Montmorency Forest,Québec     

Yohann Tremblay  Alain N. Rousseau  André P. Plamondon  Denis Lévesque  Marcel Prévost 《水文研究》2009,23(5):764-776

Summer stream water quality was monitored before and following the logging of 50% of the boreal forest within three small watersheds (<50 ha) nested in the ‘Ruisseau des Eaux‐Volées’ Experimental Watershed, Montmorency Forest (Québec, Canada). Logging was conducted in winter, on snow cover according to recommended best management practices (BMPs) to minimize soil disturbance and protect advance growth. A 20‐m forest buffer was maintained along perennial streams. In watershed 7·2, cut‐blocks were located near the stream network and logging was partially allowed within the riparian buffer zone. In watersheds 7·5 and 7·7, logging occurred farther away from the stream network. Observations were also made for watershed 7·3 that collected the runoff from watersheds 7·2 and 7·5, and watershed 7·6, the uproad portion of watershed 7·7. The control watershed 0·2 was contiguous to the impacted watersheds and remained undisturbed. Following clearcutting, changes in summer daily maximum and minimum stream temperatures remained within ± 1 °C while changes in diurnal variation did not decrease by more than 0·5 °C. Concentrations of NO₃^? greatly increased by up to 6000% and concentrations of K⁺ increased by up to 300% during the second summer after logging. Smaller increases were observed for Fe_total (up to 71%), specific conductance (up to 26%), and Mg²⁺ (up to 19%). Post‐logging pH decreased slightly by no more than 7% while PO₄^3? concentration remained relatively constant. Suspended sediment concentrations appeared to increase during post‐logging, but there was not enough pre‐logging data to statistically confirm this result. Logging of moderate intensity and respecting established BMPs may account for the limited changes of water quality parameters and the low exceedances of the criteria for the protection of aquatic life. The proximity of the cutover to the stream network and logging within the riparian zone did not appear to affect water quality. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

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刘冬英 《大地测量与地球动力学》2008,28(6):53-55

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基于微地震技术的油田裂缝监测及模拟   总被引：2，自引：0，他引：2  

王爱国  周瑶琪  陈勇  王强 《中国海洋大学学报(自然科学版)》2008,38(1):116-120

研制了1套以三分量MEMS检波器为核心硬件的微地震监测系统,并结合GPS系统对监测过程进行精确授时.同时编制数据化记录和处理软件,实现网络化自动监测功能;通过开发计算机判别标准和实时定位理论系统,对数据和微震源进行自动化处理和计算.利用该系统对东辛油田营11进行了6个月现场注水微震监测,对监测数据的处理表明营11注水区域裂缝发育方向基本上为NE90°-NE125°,与地应力裂缝模拟结果相符较好,两者结合给出了这个地区合理开发部署建议.  相似文献   

Isotopic,trace element and nutrient characterization of coastal waters from Ubatuba inner shelf area,south-eastern Brazil     

P.P. Povinec  J. de Oliveira  E.S. Braga  J.-F. Comanducci  J. Gastaud  M. Groening  I. Levy-Palomo  U. Morgenstern  Z. Top 《Estuarine, Coastal and Shelf Science》2008

Stable isotopes, tritium, radium isotopes, radon, trace elements and nutrients data were collected during two sampling campaigns in the Ubatuba coastal area (south-eastern Brazil) with the aim of investigating submarine groundwater discharge (SGD) in the region. The isotopic composition (δD, δ¹⁸O, ³H) of submarine waters was characterised by significant variability and heavy isotope enrichment. The stable isotopes and tritium data showed good separation of groundwater and seawater groups. The contribution of groundwater in submarine waters varied from a few % to 17%. Spatial distribution of ²²²Rn activity concentration in surface seawater revealed changes between 50 and 200 Bq m⁻³ which were in opposite relationship with observed salinities. Time series measurements of ²²²Rn activity concentration in Flamengo Bay (from 1 to 5 kBq m⁻³), obtained by in situ underwater gamma-spectrometry showed a negative correlation between the ²²²Rn activity concentration and tide/salinity. This may be caused by sea level changes as tide effects induce variations of hydraulic gradients, which increase ²²²Rn concentration during lower sea level, and opposite, during high tides where the ²²²Rn activity concentration is smaller. The estimated SGD fluxes varied during 22–26 November between 8 and 40 cm d⁻¹, with an average value of 21 cm d⁻¹ (the unit is cm³/cm² per day). The radium isotopes and nutrient data showed scattered distributions with offshore distance and salinity, which implies that in a complex coast with many small bays and islands, the area has been influenced by local currents and groundwater–seawater mixing. SGD in the Ubatuba area is fed by coastal contaminated groundwater and re-circulated seawater (with small admixtures of groundwater), which claims for potential environmental concern with implications on the management of freshwater resources in the region.  相似文献