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深层低渗油层渗流规律及水驱油特征研究 总被引:3,自引:1,他引:3
深层低渗油藏的渗流规律及水驱油特征具有特殊性。通过中原油田文13北块的岩心试验资料的分析、研究,认为深层低渗油藏单相流体渗流表现为非达西流特征,渗透率越低,启动压力梯度越大;油水两相渗流特性反映束缚水饱和度高,油水两相流动范围窄;具有垂直于流动方向裂缝的储层采收率最高。为该块及同类型油藏分析剩余油分布规律、制定合理的提高采收率方案提供了依据。 相似文献
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Distribution of rare earth elements in sewage-irrigated soil profiles in Tianjin, China 总被引:1,自引:0,他引:1
The concentrations of rare earth elements(REEs)in the soil extracts and soil solutions from two different alluvial soil profiles irrigated with sewage were measured using inductively coupled plasma-mass spectrometry.The results showed that the REE concentrations in the soil extracts from soil samples affected by sewage irrigation were much higher than those in virgin soil samples.The REE concentrations in the soil extracts of the rhizophere soil were higher than those of the non-rhizophere soil.The shale-normalized REE patterns in the soil extracts from the upper soil layer affected by sewage irrigation shown middle REE(MREE)enrichment relative to light REE(LREE)and heavy REE(HREE).This result was attributed to the MREE-rich organic colloidal material,REE-HM(humic and fulvic acids)and phosphate-REE complexations.The REE patterns in the soil extracts from deep soil little-affected by sewage irrigation showed HREE enrichment relative to LREE,which might have been caused by the preferential complexation of HREE with carbonate.The normalized La/Yb ratios in the soil extracts increased with the decrease in depth.The sewage irrigation did not affect the total REE contents and REE pattern in the soil profiles. 相似文献
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王中良 《中国建筑金属结构》2001,(2):25-26
本公司原系专业门窗模具制造企业,20多年来一直在门窗行业精心耕耘,94年起调整产品结构,涉足门窗加工设备生产,成为行业内从事模具、设备一体化生产的企业。本人认为设备质量的优劣与门窗加工企业的质量及效益有直接的联系。就平时所 相似文献
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近年来极端气候事件频发,导致城市内涝和山洪灾害防治形势日益严峻,而山地城市往往同时面临着这两个问题,造成的生命财产损失也更加严重。采用近25 a国家政府部门统计的中国城市内涝和山洪灾害数据,基于目前正在开展的海绵城市及山洪灾害防御项目的建设现状,详细分析山地城市内涝与山洪灾害防治的特点,即分布范围广、突发性强、受灾频繁、危害大、损失重,并基于二者的相互关系、产生原因、存在问题和防治措施体系等方面,探讨对二者共同防治的具体有效措施。分析表明:山洪和内涝的相互叠加加剧了山地城市洪涝灾害的严重性,应结合工程措施和非工程措施共同治理。 相似文献
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Inorganic Speciation of Rare Earth Elements in Chaohu Lake and Longganhu Lake, East China 总被引:1,自引:0,他引:1
Geochemical behaviors of the rare earth elements(REEs)in river and lake water bodies are dependentmainly on water chemistry and other factors,andhence their variationsin concentration and compositionreflect changes of various environmental variables.There… 相似文献
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酱油生产中的原料配比直接影响到成品风味与成品所含各种成分的比例,合理的原料配比是能够酿造出色、香、味、体俱佳酱油的首要条件,原料配比对酱油成品的影响可以通过对中间环节的影响表现出来,本文从酱油生产中的制曲、发酵、后处理以及成品储藏等几个环节阐述淀粉质原料在酱油生产中的重要性. 相似文献