鄂尔多斯盆地延长组超低渗透砂岩储层微观孔隙结构特征研究

54220083GEOLOGICALREVIEWVol.54No.2Mar.2008:973(2003CB214600):2007205208;:2008201212;::,,19772007Email:[e-mail]1),1),2)1),,710065;2),,710069:254019,,,;210215011012;,,,:;;;;;,,(,2000;,2000;,2002;,2002;,2006),(256406198),,,015,,(,2005;,2006;,2006a,2006b)1(1),(),(K),,25,40,19,19(1),,,,,10;,5%,1Table1TheparametersofreservoirpropertyoftheYanchangFormationintheOrdosbasin(%)K(10-3m2)25401914.212.414.52.31.76.29.738.8412.451.590.3240.70.0130.0040.080.3260.0680.27122.3181.008.7522.1(22ah),2540,1Fig.1TherelationscurvebetweenthepermeabilityandtheporosityoftheYanchangFormationintheOrdosbasin2Table2Theporetypesinsuper2lowpermeabilityreservoiroftheYanchangFormationintheOrdosbasin254019668(%)(%)(%)(%)(%)(%)1.741.290.670.230.290.251.280.250.352.790.740.2(%)3.932.423.73;192Fig.2Thecapillarypressuresaturationcurveinsuper2lowpermeabilitysandstonereservoir1974180%,25(44127%),40(11198%)4073155%,25(55173%),19(25120%)40(14146%),,,,,,,,,(,2002;,2003;,2006)40,,,2.2162(3),()(,2002;,2005),(40)(2)(3)23,(),31722:3Fig.3TherelationscurvebetweenthevolumeofHgsinjectionandthroatradiusinsuper2lowpermeabilitysandstonereservoirabscissaisthethroatradiuscorrespondingtopresureofHgsinjection3Table3ThecharacteristicparametersofporethroatoftheYanchangFormationintheOrdosbasinSPRmax(m)pT(MPa)r50(m)pc50(MPa)SHgmax(%)EW(%)4.1147.35023.78210.425498.493896.5055.700.2430.0730.18230.00751.727712.305.901.6541.1882.67550.102111.286977.0229.29,,,(3a,3b)2.3(4),,,,(40);,34,,();,,,((,2003;,2004;,2006)),2.44,,,,,,,,,,,,,,2722008458222/Fig.4TherelationsbetweenthevolumeofHgsinjection,ortheproportionofpermeability,andthroatradiusinZhuang58222abscissaisthethroatradiuscorrespondingtopresureofHgsinjection,,,(Rmax),,RmaxK(5b),42.5,,,210215,,(5c,d),,,,,,(40);,,,,(,1999),,,,,2.6,(5e,f),K(),,,,,,0110123722:47220085Fig.5Therelationbetweencharacteristicparametersofpore2throatandpropertyparametersinsuper2lowpermeabilityreservoir(a)(b);(c)(d);(e)(f);(g)(h);(i)(j)(a),(b)therelationscurvebetweenthemaximumthroatradiusandthepropertyparameters;(c),(d)therelationscurvebetweenthroatsortingcoefficientandpropertyparameters;(e),(f)therelationscurvebetweenthroatcoefficientofvariationandpropertyparameters;(g),(h)therelationscurvebetweenthroatcoefficientofmeanandpropertyparameters;(i),(j)therelationscurvebetweenthroatcoefficientofstructureandpropertyparameters6Fig.6Thecapillarypressuresaturationcurveofsampleswithmicrofractures(a)55226/96780141780148m,=11110%,K=111810-3m2,SP=214103,Rmax=71350m,pT=012506MPa,r50=014218m.pc50=117427MPa,SHgmax=8117%,EW=2419%(b)19321271802127190m,=13140%,K=0154910-3m2,SP=213004,Rmax=214909m,pT=012951MPa,r50=010922m,pc50=719699MPa,SHgmax=91132%,EW=39163%(a)Yan5,No.5226/96,780141780148m,=11110%,K=111810-3m2,SP=214103,Rmax=71350m,pT=012506MPa,r50=014218m,pc50=117427MPa,SHgmax=8117%,EW=2419%.(b)Zhuang19,No.3,21271802127190m,=13140%,K=0154910-3m2,SP=213004,Rmax=214909m,pT=012951MPa,r50=010922m,pc50=719699MPa,SHgmax=91132%,EW=39163%2.7,(5g,h),K,,2.8(5i,j),,,,(,),,2.9,(50m,,(,2006)),(2i,j)(2k,l),(2n,o),(2o)(2n)5722:(6)6,55226/96193012506MPa012951MPa;71350m214909m;214103213004,(,2006),,,(,2000;,2005),,,3:(1),210215,011012,(2),,(3)(4),/References.2000..,27(6):4546,49.,,,,.2002..,20(4):639643.,,,.2005..,26(4):2933.,,,.2006..,24(4):483487,,.2006..,27(2):194199,217,,.2002..,29(2):8689.2000..,27(6):4749,,,,.2006..,80(5):664673,.2002..(),32(4):329334,,,,,,.2005..,32(3):4144,,,,,,.2003.6-8.,21(3):373379,,.2000..,21(4):5257,,,.2006.X2CT.,80(5):775779,.2005.1.,26(5):9093,,.1999..,26(5):4648,.2003..,24(4):4853,,,,.2002..,20(1):7579,,,.2006a..,80(5):648655,,,,,.2006b..,27(5):2427,34,,,.2004.8.,22(2):225233,,,,.2006..,27(1):9296,,.2006..,52(6):777782/Explanationofphotosa.531761.501761.53m,b.34967.54967.59m,c.33846.45846.48m,d.311494.011494.03m,e.531786.531786.56m,f.13686.70686.80m,g.271632.901632.98m,h.311468.601468.30m,i.3806.58806.66m,j.3895.62895.68m,k.12859.21859.24m,l.34938.12938.20m,m.501040.291040.32m,n.181716.521716.55m,o.311496.831496.85m,6722008TheResearchofMicro2PoreStructureinSuper2LowPermeabilitySandstoneReservoiroftheYanchangFormationinOrdosBasinWANGRuifei1),CHENMingqiang1),SUNWei2)1)CollegeofPetroleumEngineering,XianShiyouUniversity,Xian,710065;2)StateKeyLaboratoryofContinentalDynamics,NorthwestUniversity,Xian,710069Abstract:Bythephysicalpropertyanalysis,SEM,castingslice,andthetechnologyofHighpressureHginjection,Super2lowpermeabilitysandstonesamplesinYan225,Zhuang240,andZhuang219areasoftheYanchangFormationinOrdosbasinweretested,inordertoanalyzethemicro2porestructure.Theresearchshowstheheterogeneityisintense.Thevarietyofporesandthroatsaremainreasonsthatthepermeabilityislow.Whenthesortingcoefficientofporethroatisfrom2.0to2.5andthecoefficientofvariationisfrom0.1to0.2,thereservoirqualityisgood.Thecoarsethroatisthesignificantfactorforthepermeability,andthefinethroatissignificanttothestoragevolume.Themicrofractureisverygood.Thedifferenceofquality,parametersofporethroat,andsoonresultsofthemicro2porestructure.Keywords:Ordosbasin;super2lowpermeabilitysandstonereservoi