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Factors influencing pore-pressure prediction in complex carbonates based on effective medium theory 被引量:3
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作者 Wang Ruihe Wang Zizhen +2 位作者 Shan Xun Qiu Hao Li Tianyang 《Petroleum Science》 SCIE CAS CSCD 2013年第4期494-499,共6页
A calculation model based on effective medium theory has been developed for predicting elastic properties of dry carbonates with complex pore structures by integrating the Kuster-Toksǒz model with a differential meth... A calculation model based on effective medium theory has been developed for predicting elastic properties of dry carbonates with complex pore structures by integrating the Kuster-Toksǒz model with a differential method.All types of pores are simultaneously introduced to the composite during the differential iteration process according to the ratio of their volume fractions.Based on this model,the effects of pore structures on predicted pore-pressure in carbonates were analyzed.Calculation results indicate that cracks with low pore aspect ratios lead to pore-pressure overestimation which results in lost circulation and reservoir damage.However,moldic pores and vugs with high pore aspect ratios lead to pore-pressure underestimation which results in well kick and even blowout.The pore-pressure deviation due to cracks and moldic pores increases with an increase in porosity.For carbonates with complex pore structures,adopting conventional pore-pressure prediction methods and casing program designs will expose the well drilling engineering to high uncertainties.Velocity prediction models considering the influence of pore structure need to be built to improve the reliability and accuracy of pore-pressure prediction in carbonates. 展开更多
关键词 CARBONATES effective medium theory elastic properties pore-pressure prediction pore structure
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一种缺陷态光子晶体的气敏传感理论研究 被引量:3
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作者 张乐欣 张冉 李志全 《传感技术学报》 CAS CSCD 北大核心 2007年第7期1475-1478,共4页
利用Bruggeman介电常数近似理论,毛细冷凝作用以及一维光子晶体传输矩阵的理论分析方法,对多孔硅微腔被一定浓度的有机物蒸汽吸附时的传感特性进行了深入地研究,建立了其光学传感模型,并用计算机数值模拟的方法对多孔硅微腔的传感模型... 利用Bruggeman介电常数近似理论,毛细冷凝作用以及一维光子晶体传输矩阵的理论分析方法,对多孔硅微腔被一定浓度的有机物蒸汽吸附时的传感特性进行了深入地研究,建立了其光学传感模型,并用计算机数值模拟的方法对多孔硅微腔的传感模型进行了理论仿真,得出了饱和情况下有机物蒸汽折射率与峰位漂移量间的线性关系以及乙醇蒸汽浓度与微腔反射谱透射峰峰位漂移量间的函数关系曲线,为多孔硅微腔传感元件的设计和应用提供了理论基础. 展开更多
关键词 蒸汽传感 多孔硅微腔 Bruggeman介电常数近似 传输矩阵 数值模拟
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Vapor Sensing Theoretical Study on Optical Microcavities
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作者 ZHANG Le-xin ZHANG Ran LI Zhi-quan 《Semiconductor Photonics and Technology》 CAS 2007年第3期200-205,共6页
When the organic vapors absorbed to the surface of porous silicon(PS), capillary condensation takes place due to the porous structure of the PS layer, accordingly resulting in the effective refractive index changing. ... When the organic vapors absorbed to the surface of porous silicon(PS), capillary condensation takes place due to the porous structure of the PS layer, accordingly resulting in the effective refractive index changing. For PS multi-layer microcavities, the different resonant peaks shift in the reflectivity spectrum of porous silicon microcavities(PSMs). The optical sensing model is set up by applying Bruggeman effective medium approximation theory, capillary condensation process and transfer matrix theoretically analytical method of one-dimensional photonic crystals. At the same time, comprehensively researched on are the sensing characteristics of PSMs which are exposed to give concentration organic vapors. At last, made is the theoretical simulation for sensing model of the PSMs in case of saturation by using computer numerical calculation, and found is the linearity relation between the refractive index of organic solvent and the peak-shift. At the same time deduced is the peak-shift as a function of the concentration of ethanol vapors. 展开更多
关键词 PSMs vapor sensing Bruggeman effective medium approximation theory capillary condensation transfer matrix numerical calculation
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等效介质理论用于单向纤维增强复合材料弹性性能的数值计算 被引量:6
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作者 区焕文 徐稳林 冼定国 《复合材料学报》 EI CAS CSCD 北大核心 1994年第3期50-55,共6页
本文把一套等效介质理论简化成为一数值方法,用于横观各向同性组分构成的单向纤维增强复合材料弹性性能的计算。我们计算了几个单向纤维增强的系统并把计算值与实验值作出比较,得到很好的符合。
关键词 等效介质 弹性 复合材料 纤维增强
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等效介质理论数值方法应用于随机取向纤维复合材料的杨氏模量 被引量:3
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作者 区焕文 徐稳林 冼定国 《复合材料学报》 EI CAS CSCD 北大核心 1994年第4期55-60,共6页
本文运用了等效介质理论数值方法 ̄[4],计算单向纤维增强复合材料的弹性常数,进而透过Christensen&Waals ̄[3]的一套平均公式,计算二维及三维随机取向纤维复合材料的杨氏模量,以探讨等效介质理论对此类材料... 本文运用了等效介质理论数值方法 ̄[4],计算单向纤维增强复合材料的弹性常数,进而透过Christensen&Waals ̄[3]的一套平均公式,计算二维及三维随机取向纤维复合材料的杨氏模量,以探讨等效介质理论对此类材料的适用性。计算结果与基于Halpin-Tsai ̄[8]式及Christensen ̄[7]式的结果甚为相近,与实验值也有很好的符合。 展开更多
关键词 等效介质理论 数值方法 随机取向 纤维复合材料
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