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(1)(1)(2)(1)(1)(1)(1)()(2),,15,,,,,1:,(),,[1],,,,,35,1535,0.014%,1.48,14C:1747cm/100a,23165cm/100a[1]6(3):,(1)12(1),,,350m,,10m,,,;,3,1m,,,,13cm,2cm,,,,,,601200010PETROLEUMEXPLORATIONANDDEVELOPMENTVol.27No.5,(2)(1)2(2),14m,,,,,30cm,,,(3),(,20030),,,[1,2](4)(),,85%,(3),,,,,3(5),,(510320103m2),,(),13m,(6)(),,,;,(7),,,,,,,,,(4)1;2;3;4;5;6;7;8;94Smith,Smith[1],Smith,:;()701200010:,;;Smith,:Smith,,,,,,,,20cm,,,,,Smith,,6m,,,45,4.65.7m/s,1417.2m/s,,,Smith,,,,,,,,,Smith,,,,,,,;,,,0.014%;,,,,,Smith,()Smith,1SmithDG,SmithND.Sedimentationinanastomosedriversystems:examplesfromalluvialvalleysnearBanff,Alberta.J.Sed.Petrol.,1980,50:157164.2SmithDG.Anastomosedfluvialdeposits:modernexamplesfromWesternCanada.Spec.Publ.Int.Assoc.Sedimentol,1983,6:155168.,,34,,,:,,1022002000204202()801Vol.27No.5223()TE358.320000527IFP[]/CosteJean2Paul,Za2itounA....22000,27(5).29397,101(IFP),(RelativePermeabilityModifiers,DisproportionatePermea2bilityReducer),IFPIFP,IFP;IFP,IFP:,IFP;,;()6218(CosteJean2Paul)TE34520000528[]/,....22000,27(5).2981012,(),U2011.74,123()P512.2P931.120000529[]/,....22000,27(5).21021056:,,,,,36,:;;;;;;;,,114()TE111.320000530[]/,....22000,27(5).2106108,,,,();;]8[Vol.27No.5,,;,,2Smith42()TE125.620000531[]/,....22000,27(5).2109111,114IP21432,,,2,1622()TE257.1TE12520000532[]/,.22000,27(5).2112114,,,,,APIRP43(),,,,;,;,,414()P631.8220000533[]/,....22000,27(5).2115118,121,,,,,;,,,,,,90%,,,44()P631.84P5320000534[]/.22000,27(5).2119121]9[Vol.27No.5Depositionalsystemanalysisontheevolutionmodelofancientrivertypeanditscontrollingfactors.WANGSui2ji;etal.(DepartmentofHydraulicandHydropowerEngineering,TsinghuaUniversity,Beijing100084,P.R.China).ShiyouKantanYuKaifa2000,27(5),1022105.Sixmodelsevolvedwithtimehavebeenidentifiedinancientfluvialdepositionalsystems:(1)braidedmeanderingsystem;(2)meanderingbraidedsystem;(3)braidedanastomosingsystem;(4)anastomosingbraidedsystem;(5)anastomosingmeanderingsystem;and(6)meanderinganastomosingsystem.Characteristicsof6transformationmodelsof3fluvialtypesandtheirgenesisarediscussedaccordingtoactualexamples.Possiblespatialdistributionofeachevolutionalmodelofancientrivertypesareanalyzed.Allmaincontrollingfactorsaffectingtheevolutionofancientfluvialtypesaresummarizedsystematically:(1)riverchannelslope;(2)compositionofriverbankandfloodplainmaterials;(3)vegetationcoverage;(4)amountandcompositionofsanddeposited;(5)rateofchangeofwatercurrent;(6)climatefactors;(7)tectonicfactors;(8)changeofsea2level.Itisrecognizedthatthesefactorsrelateoneanotherusually;however,theeffectsofeachfactorisdifferentatdifferenttimeanddifferentpoint.Geologicaltectoniceffectsandthechangeofpalaeoclimatewillbethemaincontrollingfactorsascomparedwiththecontrollingfactorsaffectingthespatialtransformationofmodernriverfluvialpatterns.Subjectheading:Ancienttime,Fluvialdeposit,Rivertype,Fluvialfacies,Depositionalmodel,Evolution,Spatialdistribution,InfluenceDepositionalcharacteristicsofthemodernanastomosingriverinQiqiharsectionofNenjiangriver.XIEQing2bin;etal.(UniversityofPetroleum,Beijing102249,P.R.China).ShiyouKantanYuKaifa2000,27(5),1062108.Sandbodyofanastomosingrivercanreserveoilandgas,somoreandmorepetroleumgeologistshavepaidattentiontoresearchingitsdepositionalcharacteristics.AlotofrivershavebeendevelopedanastomosingriversectioninChina.OneoftheexamplesisQiqiharsection,Nenjiangriver.ThemodernanastomosingriverinQiqiharsectionofNenjiangrivercontainslowgradient,highaggradationrate,multiplechannelandlarge2areawetlandbetweenthechannels.Channels,naturallevees,crevasse2splay,floodplain,lakes,marshesandeoliandunesareimportantmorphologicalandsedimentaryunits.Anastomosingchannelfillingsedimentsaremainlycomposedofpebblysandandmediumtofinesands.Internallychannelsandbodyconsistsmainlyoftroughcross2strataandobliquebedding.Theothermorphologicalunitsaremainlycomposedoffinegrainedsediments.Amilieuofsubsidence,lowgradient,highaggradationrateandeasilybursthavebeenthemaincausesfortheanastomosingriverinQiqiharofNenjiangriver.ThereareobviouslydifferencesbetweenthecharacteristicsoftheanastomosingriverinQiqiharofNenjiangriverandthatofwhichSmithhaddescribed.Thecharacteristicsincludelateralmigration,eoliandunes,biggerwidthtodepthandsandbodyalternatedasboatshape.Subjectheading:Recent,Anastomosingriver,Depositionalfeature,Streamchannel,Floodplain,Sedimentaryfaciespattern,NenjiangriverN2alkaneasphalteneprecipitationandthemechanismoftheirformation.HUYu2feng;etal.(UniversityofPetroleum,Beijing102249,P.R.China).ShiyouKantanYuKaifa2000,27(5),1092111,114.ThestandardIP2143methodhasbeenusedtodeterminetheamountofasphalteneprecipitationwhentheGudaoandCaoqiaocrudeoilsweredilutedwithvariousn2alkanes.Theresultsshowthattheamountofasphalteneprecipitationdecreaseswiththemolecularweightofn2alkaneandincreaseswiththeprecipitant2to2oilratio.Anewmechanismofasphalteneprecipitationhasbeenproposedbyusingthethermodynamicmicellizationmodel.Thenewmechanismisbasedontheassumptionthatmostasphaltenemoleculesexistasmicellesinacrude,wherethemicellarcoreistheasphalteneassociatesandthesolvatedshellcons