论瞬变电磁测深法的探测深度

2003916:(49974026),()..,2004,39(5):575578,,,;,,,,,,[1],,,,,,,,,,,,:,,,,,,,,[2],,,,,,RCL,200410395©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.[35],1R3,R,C,U,L,,,,,IR-i11pC+i21pC=0(1)i2pL+1pC+R3-i11pC=0(2)i1=p2+m2p(p+m)2=p(p+m)2+m2p(p+m)2,i1(t)=2Imte-mt()(3)U(t)=2IRmte-mt()(4):p;m,m=1öLC,s-11,(4),:t=0,U(t)=0;,t=1m,U(t);t1m,m,L[4]L=22.2810-7lnar0-1175(5):a,ar0,r0=0.73mm;CRLC=4LC1,C1,16010-9F,,,:(1),(5);(2),m;(3)m,t=1m,U(t);(4)(4),U(t);(5)U(t);(6)(4),(5),tmin,Ls;(7)hmin=tminQ,:hmin,m;Q,8m50m50m,100m100m,200m200m,600m600m,12600m600m(:1101V)12,600m600m,11.5Ls,6.335V0.005V,,,22,,,1600m600mtöLs11.522.533.544.555.566.57U(t)öV6.3355.8515.0844.0263.062.2621.6621.1670.8210.5270.3950.2710.185töLs7.588.599.51010.51111.51212.513U(t)öV0.1250.0850.0570.0380.0250.01680.0110.00830.0050.0030.00230.00166752004©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2600m600m,;,,10Ls,,1;,2,,2(Ls)(mm)5050100100200200600600tend(Ls)1010.51111.533,,,,,;,,3(m)(mm)Qö(8m)1105010020050503.161022.3631.644.721001003.2410.2422.9132.445.822002003.3110.4823.4533.1646.906006003.3910.722.433.9147.95,,,,,,h=4PtöRL0(6)Vz=5h5t=2PRL0t(7):t;R;L0(6)t=2P10-7h2öQ(8),t=L0MöG2400PQ131ö5(9):M;Q1;G,(8)(9),h=0155MQ1G1ö5(10)(10),(10),(),4545,,,,4(:m)(mm)Qö(8m)11050100200505075.5120.2165.9190.6218.9100100100.1158.7218.9251.5288.9200200132.1209.4288.9331.8381.2600600164.4253.9448.3515.0591.6:0.5nVöm2,I=10A775395:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.5(:m)(mm)Qö(8m)11050100200505087.7138.1190.6218.9251.5100100115.0182.2251.5288.9331.8200100151.7240.5331.8381.2437.9600600235.5373.2515.0591.6679.5:0.5nVöm2,I=20A,,,,,,,,,:,10Ls,150m;,,,,,,[1],,..:,1993[2]..:,2002[3]AkaufmamAandHoekstraP.ElectromagneticSound2ings.Amsterdam:Elsevier,2001[4]..:,1998[5]..:,1992[6]KamenetskyFandOelsnerC.DistortionsofEMtran2sientsincoincidentloopsatshort2time2delay.Geophys2icalProspecting,2000,48(6):983993(:)1ms,10250Hz,34m;2ms,10125Hz,67mhttp:ööliuqy39.myrice.com,::804:300450::022225818348,022225305348:13820399721:022225305348Email:[e-mail]8752004©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.tions.Thepaperanalyzedtheinfluenceofsurfacemodel,near2surfacemodelandintervalvelocitymodelonstaticcorrectionsandimaging,studiedmutualrelationamongstaticcorrectionsandimag2ingaswellasintervalvelocitymodelintheproce2dureofdataprocessing,presentedtherealizedmethodsofprestackdepthmigrationwhentheve2locitymodelincludedsurfaceelevationandnear2surfacemodelandreasonablysolvedthecombinedinfluenceofsurfaceelevation,surfaceweatheredlayerandnear2surfacelayersonstaticcorrectionsandseismicimaging,whichachievedgoodappliedresults.Keywords:Tu2HaOilfield,prestackdepthmigra2tion,surfacemodel,staticcorrectionsYangBiao,DepartmentofExploration,Tu2HaPetroleumCompany,ShanshanCounty,XinjiangUygurAutonomousRegion,838200,ChinaOnsurveyingdepthbytransientelectromagneticsoundingmethod.XueGuo-qiang.OGP,2004,39(5):575578Thetemporalprocedureofequivalentcircuitoftransientelectromagnetictransmitterloopisan2alyzedinthepaper,thetheoreticalexpressionsofamplitudeofloopself2inductionsignalisdeduced,whichconsideredthattheattenuationofloopself2inductionsignalisnotonlyrelativetotime,butal2sotothematerialofequivalentloops;theampli2tudeandtime2decayscopeofself2inductionsignalswithdifferentloopsizesarecomputed,whichob2tainedtheconclusionthatthereistheminimumdepthwhenusingtransientelectromagneticmethodforsoundingsurvey.Thetransientelectromagneticmethodhasamaximumdepthbecauseofcontinu2ousattenuationbytransmissionofelectromagneticsignalinunderground.Thepapergavethemethodandevaluationresultsforevaluatedminandmaxsoundingdepthsbyusingtransientelectromagneticsoundingintheconditionsofcommonequipments(differentcoilsizesanddifferentmediumresistivi2ty)andtypicalgeoelectricscenario.Theresultedtransientelectromagneticsoundingdepthsplayedaguideroleinfieldproduction.Keywords:transientelectromagneticmethod,mini2mumsoundingdepth,maximumsoundingdepth,loopself2induction,signaldecayXueGuo-qiang,TeachingandResearchSectionofElectro2Vacuum,ElectronicDepartment,CollegeofElectronicandCommunication,Xi’anJiaotongUniversity,Xi’anCity,ShanxiProvince,710049,ChinaDataprocessingjoiningseveral3-Dseismicsurvey-ingblockstogetherinShengliOilfield.LiuCheng-zhai.OGP,2004,39(5):579585Total189blocksof32Dseismicdataacquisi2tionhavebeenfinishedinShengliOilfield.Inordertointegrativestudyingregionalgeologicstructuresandroleofoilaccumulation,itisnecessarytoim2plementthedataprocessingjoiningseveral32Dseismicsurveyingblockstogether.Thepapersummedupasetofbasicflowfordataprocessingjoiningseveral32Dseismicsurveyingblocksto2gethersuitableforcomplexareasafteranalyzingthisrealdataprocessing.Duringthisprocessing,weadoptedrelativeprocessingmethodsandtoolsaimedatinconsistencebetweenblocks,whichmadejoined32Ddatablockshavegoodconsistenceofphaseandporosityandnaturalandreasonablefre2quencyandenergy(oramplitude),italsomadethegeologicfeaturesuchasoverlap,unconformability,fractureandpinchouthavegoodreflectiononthesections.Itisseenf