页岩气藏多重介质流-固耦合渗流规律研究

页岩气藏多重介质流—固耦合渗流规律研究页岩气藏多重介质流—固耦合渗流规律研究

摘要：页岩气藏是一种具有特殊地质条件和复杂流态特性的独特储层，介质种类繁多、流场复杂且尺度差异明显，研究其多重介质流—固耦合渗流规律有着重要的理论意义和实际应用价值。本文以页岩气藏为研究对象，通过建立多孔介质流动、固体力学和热力学传递耦合的数学模型，分析研究了页岩流体运动和固体变形情况，并对撕裂、孔隙压力等影响因素进行了深入探讨和数值模拟。研究表明，页岩气藏多重介质流—固耦合渗流规律受多种因素共同影响，其中包括围压、温度、含水量、孔隙度、孔隙结构和充满度等；页岩气藏的吸附效应、扩散效应和渗透效应也会对流动和变形过程产生显著的影响。同时，通过对数值模拟结果的分析，本文发现了页岩气藏多重介质流—固耦合渗流规律中存在的一些问题和局限性，对于未来更加深入的研究具有重要的指导意义和启示价值。

关键词：页岩气藏；多重介质流；固耦合渗流；数值模拟；影响因素

Abstract:Shalegasreservoirisauniquereservoirwithspecialgeologicalconditionsandcomplexflowcharacteristics.Ithasvarioustypesofmedia,complexflowfieldsandobviousscaledifferences.Studyingthemulti-mediumflow-solidcouplingseepagelawhasimportanttheoreticalsignificanceandpracticalapplicationvalue.Inthispaper,takingtheshalegasreservoirastheresearchobject,amathematicalmodelcouplingporousmediumflow,solidmechanicsandthermodynamicstransferisestablishedtoanalyzethefluidmotionandsoliddeformationofshaleandtoexplorethefactorsaffectingthetearingandporepressureindepth.Thestudyshowsthatthemulti-mediumflow-solidcouplingseepagelawofshalegasreservoirisinfluencedbymanyfactors,includingconfiningpressure,temperature,watercontent,porosity,porestructureandfillingdegree.Theadsorptioneffect,diffusioneffectandpermeationeffectofshalegasreservoiralsohavesignificantimpactontheflowanddeformationprocess.Atthesametime,throughtheanalysisofnumericalsimulationresults,thispaperfindssomeproblemsandlimitationsinthemulti-mediumflow-solidcouplingseepagelawofshalegasreservoir,whichhasimportantguidingsignificanceandenlightenmentvalueforfuturein-depthresearch.

Keywords:Shalegasreservoir;Multi-mediumflow;Solidcouplingseepage;Numericalsimulation;InfluencefactorsThestudyofmulti-mediumflow-solidcouplingseepagelawinshalegasreservoirshasgainedsignificantattentioninrecentyears.Shaleformationsareusuallyhighlyheterogeneousandexhibitcomplexporestructures,whichmakestheflowanddeformationprocessquitechallengingtomodelaccurately.Therefore,numericalsimulationhasbecomeanimportanttooltoinvestigatetheflowandtransportbehaviorinshalegasreservoirs.

Oneofthecriticalfactorsinfluencingthemulti-mediumflow-solidcouplingseepageinshalegasreservoirsistheporestructureofshalerocks.Duetothelowpermeabilityandhighheterogeneityofshaleformations,itischallengingtoobtainaccurateporestructureinformationfromconventionallaboratorytests.However,theadvancementofimagingtechnologiessuchasscanningelectronmicroscopy(SEM)andmicro-computedtomography(micro-CT)haveprovidednewtoolstoinvestigatetheporestructureandconnectivityinshalerocks.

Anotherkeyfactorthataffectsmulti-mediumflow-solidcouplingseepageinshalegasreservoirsistheinteractionbetweenfluidsandsolids.Shalerockscanbehaveelasticallyorplastically,dependingonthepressureandtemperatureconditions.Theinteractionbetweenfluidsandsolidscancausedeformationoftherockmatrix,leadingtochangesinthepermeabilityandporosityoftheshaleformation.Therefore,itiscrucialtoconsiderthegeomechanicalpropertiesofshalerockswhenstudyingtheflowandtransportbehaviorinshalegasreservoirs.

Theheterogeneityofshaleformationscanalsosignificantlyaffecttheflowanddeformationprocess.Shalerocksoftenexhibitsignificantvariationsintheirmineralogy,organiccontent,andgrainsizedistribution.Thespatialdistributionofthesepropertiescaninfluencethepermeabilityandporosityofthereservoir,leadingtospatialvariationsintheflowandtransportbehavior.

Inconclusion,thestudyofmulti-mediumflow-solidcouplingseepagelawinshalegasreservoirsisacomplexandchallengingtask.Theporestructureofshalerocks,theinteractionbetweenfluidsandsolids,andtheheterogeneityofthereservoirareallcriticalfactorsthatneedtobeconsideredwhenstudyingtheflowandtransportbehaviorinthesesystems.Numericalsimulationhasproventobeavaluabletoolininvestigatingtheflowanddeformationprocessinshalegasreservoirs,buttherearestillmanylimitationsandchallengesthatneedtobeaddressedinfutureresearchInadditiontothecomplexitiesinherentinshalegasreservoirs,otherchallengesincludethelackofgeomechanicalandpetrophysicaldata,thepresenceofnaturalfractures,andtheuncertaintiesassociatedwiththepropertiesofthereservoir.Extractionofgasfromshalereservoirsalsopresentsenvironmentalandeconomicchallenges.Forexample,hydraulicfracturingrequirestheuseoflargequantitiesofwaterandchemicals,whichcanpollutegroundwaterandcauseenvironmentaldamage.

Oneareaofresearchthatisgainingincreasingattentionistheuseofmachinelearninganddataanalyticstoimprovetheunderstandingofflowbehaviorinshalegasreservoirs.Machinelearningalgorithmscananalyzelargedatasetstoidentifypatternsandrelationshipsthatwouldbedifficultorimpossibleforhumanstodetect.Byincorporatingdatafrommultiplesources,includinggeophysical,geochemical,andgeomechanicaldata,machinelearningcanhelptoimprovetheaccuracyofreservoirmodels,whichcaninturnleadtomoreeffectivestrategiesforgasextraction.

Anotherimportantareaofresearchisthedevelopmentofnewtechniquesformeasuringandcharacterizingthepropertiesofshalereservoirs.Forexample,microseismicmonitoringcanprovideinformationaboutthelocationandextentoffracturesgeneratedbyhydraulicfracturing,whilenuclearmagneticresonance(NMR)loggingcanbeusedtomeasuretheporosityandpermeabilityofshalerock.Thesetechniquescanhelptoimprovetheaccuracyofreservoirmodelsandenhanceourunderstandingoftheflowbehaviorinshalegasreservoirs.

Inconclusion,thestudyofflowbehaviorinshalegasreservoirsisacomplexandchallengingtaskthatrequirestheintegrationofknowledgefrommultipledisciplines.Whilenumericalsimulationhasproventobeavaluabletoolininvestigatingtheflowanddeformationprocessinthesesystems,therearestillmanylimitationsandchallenges.Futureresearchshouldfocusondevelopingnewmeasurementandcharacterizationtechniques,incorporatingmachinelearninganddataanalytics,andaddressingtheenvironmentalandeconomicchallengesassociatedwithshalegasextractionInadditiontothetechnicalchallenges,therearealsoenvironmentalandeconomicissuessurroundingshalegasextraction.Thehighwaterconsumptionandpotentialcontaminationofgroundwater,aswellasthereleaseofgreenhousegasesandotherpollutants,haveraisedconcernsaboutthesustainabilityofthisenergysource.Itisimportantforresearcherstocontinuetoaddresstheseissuesanddevelopmitigatingstrategiestoensurethatthebenefitsofshalegasextractionoutweighthecosts.

Effectivecommunicationandcollaborationbetweenresearchers,industryprofessionals,policymakers,andthepublicisalsocritical.Giventheinterdisciplinarynatureofshalegasresearch,itisimportantforexpertsfromdifferentfields