پديد آورنده :
خامفروش، مهرداد
عنوان :
بررسي خواص تراوايي شبكه تركهاي سه بعدي غير ايزوتروپيك و هتروژن مخازن زيرزميني
گرايش تحصيلي :
مهندسي شيمي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي
صفحه شمار :
چهارده، 208، [II] ص.: مصور، جدول، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
كيقباد شمس
توصيفگر ها :
همبستگي گوسي/ ضريب تراوايي
تاريخ نمايه سازي :
26/08/86
استاد داور :
فرهنگ جلالي، محمد رضا رسايي، حميد هاشم الحسيني، محمد چالكش اميري
تاريخ ورود اطلاعات :
1396/03/08
رشته تحصيلي :
مهندسي شيمي
كد ايرانداك :
ID180 دكتري
چكيده فارسي :
به فارسي و انگليسي :قابل رؤيت در نسخه ديجيتال
چكيده انگليسي :
AbstractThe percolation properties and permeability of heterogeneous and anisotropic three dimensional fracture networks are studied numerically Both models composed of mono disperse plane hexagons In heterogeneous fracture networks the fracture centresdistributed non uniformly according to a Gaussian correlated field in space and thefracture orientations are isotropic In anisotropic fracture networks the fractures aredirected in an anisotropic way according to Fisher distribution with uniform distribution oftheir fracture centres Finite size scaling method is used to extrapolate the percolationthresholds of infinite networks The influences of degree of heterogeneity and angulardispersion parameter on percolation thresholds of fracture networks are analyzed Inheterogeneous fracture networks increased in heterogeneity degree and correlation lengthincreases the percolation threshold average number of connections per object of thenetworks For anisotropic networks percolation thresholds of three models of anisotropicthree dimensional 3D fracture networks have been calculated numerically The firstmodel is when the fracture networks are comprised of one family of fractures that aredistributed in an anisotropic manner about Z direction We call this model mono polaranisotropic fracture network MFN The second model is when the fracture networks arecomprised of two groups of fractures that are distributed in an anisotropic manner abouttwo orthogonal mean directions i e Z and X directions We call this model bipolaranisotropic fracture network BFN The second model is when three groups of fracturesare distributed about three orthogonal mean directions that is Z X and Y directions Wecall this model tripolar anisotropic fracture network TFN The effect of anisotropicity onpercolation thresholds in X Y and Z directions is investigated We have revealed thatincreased anisotropicity in MFN leads into decreased percolation thresholds in both X andY directions and in these two directions percolation thresholds in anisotropic networksdemonstrate a declining trend as anisotropicity goes up However in the Z direction thetrend is the opposite In BFN and TFN as the anisotropicity of networks increases thepercolation thresholds in X Y and Z directions span the range of 2 3 to 2 0 where 2 3and 2 0 are extremums of percolation thresholds for isotropic and non isotropic orthogonalfracture networks respectively The fracture networks are triangulated via an advancingfront technique and the macroscopic permeability of both networks are determined bysolving the two dimensional Darcy equation in each fracture The macroscopic pressuregradient of the system is related to flow problem by an effective permeability thispermeability is averaged over a large number of independent statistical realizations of thefracture networks with the same properties Also the effect of heterogeneity degree anddispersion parameter on macroscopic permeability is accounted for both networks Inheterogeneous networks we have found that the permeability decreases as theheterogeneity degree and correlation length increased In MFN the macroscopicpermeability in X and Y directions are higher than the associated permeability ofisotropic fracture networks and this property for anisotropic networks in Z direction islower compared with that of isotropic case Furthermore as the anisotropicity of networksincreases the differences become more remarkable
استاد راهنما :
كيقباد شمس
استاد داور :
فرهنگ جلالي، محمد رضا رسايي، حميد هاشم الحسيني، محمد چالكش اميري
