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1、ECAnumericalstudyof16,2pore-fluid,thermalandmassflowinfluid-saturatedporous202rockbasinsReceivedJanuary1998RevisedNovember1998ChongbinZhao,B.E.Hobbs,K.Baxter,H.B.MühlhausandAcceptedDecemberA.Ord1998CSIRODivisionofExplorationandMining,Nedlands,AustraliaKeywordsAustralia,Finiteelementanalysi
2、s,Flow,Geology,RockbasinsAbstractWepresentanumericalmethodologyforthestudyofconvectivepore-fluid,thermalandmassflowinfluid-saturatedporousrockbasins.Inparticular,weinvestigatetheoccurrenceanddistributionpatternoftemperaturegradientdrivenconvectivepore-fluidflowandhydrocarbontransportintheA
3、ustralianNorthWestShelfbasin.Therelatednumericalresultshavedemonstratedthat:(1)Thefiniteelementmethodcombinedwiththeprogressiveasymptoticapproachprocedureisausefultoolfordealingwithtemperaturegradientdrivenpore-fluidflowandmasstransportinfluid-saturatedhydrothermalbasins;(2)Convectivepore-
4、fluidflowgenerallybecomesfocusedinmorepermeablelayers,especiallywhenthelayersarethickenoughtoaccommodatetheappropriateconvectivecells;(3)Largedislocationofstratahasasignificantinfluenceonthedistributionpatternsofconvectivepore-fluidflow,thermalflowandhydrocarbontransportintheNorthWestShelf
5、basin;(4)Asadirectconsequenceoftheformationofconvectivepore-fluidcells,thehydrocarbonconcentrationishighlylocalizedintherangeboundedbytwomajorfaultsinthebasin.1.IntroductionInrecentyears,numericalmodellingofpore-fluid,thermalandmassflowinporousrockbasinshasgainedwideapplicationsthroughoutt
6、hepetroleumindustry(AllenandAllen,1990;Soreng,1990;Wangen,1993;Langtangen,1990;LewisandSchrefler,1987)andmineralsexplorationscience(NieldandBejan,1992;Phillips,1991;RaffenspergerandGarven,1995a,b;YehandTripathi,1989;Zhaoetal.,1997)forthefollowingreasons:(1)Owingtotheadvancesincomputertechn
7、ology,thereisatremendousincreaseincomputingspeedandcapacity,whichmakesitpossibletomodelapracticalproblemonalargescale.(2)Owingtosignificantimprovementsandfurtherdevelopments,manyrobustnumericalalgorithmshaveemergedforsolvingthepartialdifferentialequationsinbot
