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ID:40367343
大小:1.78 MB
页数:9页
时间:2019-08-01
《Computed Tomography for Rock-Property Determination and Fluid-Flow Visualization 》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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