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《Computed Tomography for Rock-Property Determination and Fluid-Flow Visualization 》由會員上傳分享，免費在線閱讀，更多相關內(nèi)容在學術論文-天天文庫。
1、ComputedTomographyforRock-PropertyDeterminationandFluid-FlowVisualizationE.M.WlthJack,SPE,AreoOil&GasCo.Summary.ThispaperdiscussesthedevelopmentandapplicationofX-raycomputedtomography(CT)forthedeterminationofrockpropertiesandthestudyofmiscibledisplacementsinlaboratorycores.Saturation(relativeperm
2、eability)andporositymeasurementsbyCTscanningaredescribed,andtheresultsarecomparedtothoseofconventionalmethods.Resultsofcorefloodswithmisciblefluidsshowtheinfluenceofrockheterogeneities(beddingplanes)andmobilityratioonvolumetricsweepout.Thecorefloodsalsoillustrateanewdisplaytechniquethatcombinesas
3、eriesoftwo-dimensional(2D)CTslicesintothree-dimensional(3D)perspectiveviews.IntroductionTheuseofCTforobservingfluidflowinrockandnondestruc?asprojectiondata.Rotationofthesourceanddetectorsduringscan?tivelyviewingitsinteriorpromisesnewknowledgeinpetroleumningallowsforacquisitionofprojectiondataalon
4、gmanylinesfromengineeringandtheassociatedgeologicalsciences.Unlikeconven?differentdirections.tionalX-raymethods,CTusesacomputertoreconstructa2Dim?3.ImageReconstruction.Thisstepinvolvesfindingthelinearage,orslice,intheplaneofanX-raybeamdirectedthroughanattenuationcoefficientsforallthevolumeelement
5、salongthelinesobjectfrommanydifferentdirections.Conventionalmethodsformbetweenthesourceandthedetector.Radon9establishedthemath?animagebyprojectingcompositeX-rayattenuationpatternsematicalfoundationsforimagereconstructionfromprojectiondata.(shadows)ofanobject'sinternalfeaturesontoasingleplane.AMod
6、ernmethodsarebasedontransformalgorithms.lO,llseriesofCTslicestakenashortdistanceapartcanshow3Dfea?4.ImageDisplay.TheelementsofaCT-displayscreen[cathodetureswithinanobject.raytube(CRT)]representthelinearattenuationcoefficientsofcor?TheuseofX-raystostudyoilrecoveryinthelaboratorywasrespondingvolume
7、elementsinascannedobject.TheCTcomputerpioneeredoverthreedecadesago.1,2TheearlyworkofSlobodandconvertsattenuationcoefficientsintocorrespondingnumericalCaudlelintroducedtheX-rayshadowgraphtechnique,aconven?values,orCTnum
