大庆长垣南部扶杨油层孔隙结构及渗流特征研究

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1、万方数据AbstractWiththeincreasingdemandofoilandgasresourcesanddecreaseoftherestresources，moreresearchesputfocusondevelopinglowpermeabilityanultra-lowpermeabilityreservoirs．InvestigationshaveshownthatthereststorageresourcesofFuyangreservoirsinouterDaqingPlacanticlin

2、etobeconfirmedareasmanyas400milliontons．However,thesereservoirshavescatteredsandstone，partialfracturesandbad．distributedoilandwater．Therefore，it’Squitenecessarytolearntheporestructuresandseepagecharacteristicsthroughcoreexperiments，whichisinstrumentalforahigher

3、efficientdevelopment．Fuyangreservoirsbelongtodeltaplainfacies，andsandstonesmainlydispersedinmiddle—westpartofXingnanareaandGaotaizioilfield，whichmostexistedintoppartofFIgroupandmiddlepartofFlIgroup．Thereservoirhadoillayeranddrylayeralternativelydistributedinthe

4、verticaldircction，whileinthehorizontaldirection；theymosthadchistoseandbandingdistributionwithpoorcontinuity．FuyangreservoirsweremainlyFault-lithologicandstructural-lithologicreservoirs．Andthelithologyofthereservoirwasfeldspathiclitharenitefinesandstonesandsilts

5、toneswithahighconcentrationofclay．TheairpermeabilityofFuyangreservoirwas0．1—2mD．andtheaverageporosityvariesfrom10percentto18percentwimainsideoildistributionofoiIimmersedtypeandoilpatchtype．ThroughtheConstant—rateMercuryInjection，NuclearMagneticResonanceandSOon，

6、itwasfoundoutthattheporetypesweremainlydominatedbythesmallthinthroatwinloilinsidedifficulttobeswept．Fromtherelationshipbetweenmobilefluidsratioandtheirpermeability,FuyangoilfieldhadpoorerdevelopmentthanToutaiandYushulinoilfields，butwasbetterthanBayanchaganandZh

7、aoyuanoilfields．Thereservoirsensitivitystudieshadshownstrongwater,acidandpressuresensitivityforFuyangoillayers．AndtheaveragetriggeringpressuregradientofFuyangoillayersWas0．0174MP／m，whichincreasedrapidlywhenthepermeabilitywasbelow1．0mD．Thesaturationofmobileoilde

8、creasedwhentheareaofoilwatertwo-phaseflowbecamenarrower．Inthestudy,theporestructuresandseepagecharacteristicswereinvestigated，III万方数据whilethewellnetworkinthetrialareawasfull