简介:Studiesoforganicinclusionsfromtheoffshoreoilandgasfieldsprovidemuchinformationaboutthenumberoftimes,temperature,depth,timeandphasestateofoil-gasmigration,aswellasaboutthecompositionoforganicinclusions.Onthebasisofthetype,character,compositionanddistributionoforganicinclusionsintheZhu-ⅢDepressionatthePearlRiverMouth,informationcanbedevelopedaboutthesourcerocksofoilandgas,andtheirevolutionandmigration.
简介:Onthebasisofthecarbonisotopiccompositionsofmethane(CH4)anditshomologuesandthedifferencesinisotopicvaluesforCH4andethane(C2H6)andthecorrelationandcompositionalchar-acteristicsofhydrocarbongases,theauthorhasproposedageneticclassificationofnaturalgasesintheoil-gaszone.Theyareclassifiedasbiogeneticandabiogeneticgasesintermsofthetypesofhydrocarbon-generatingprecursors(orparentmaterials)andtheirthermalevolutionstages.Biogeneticgasescanalsobefurtherdividedintotwoseries:biochemicalandthermochemicalgases,withthelat-terformedatdifferentevolutionstages.Gasesgeneratedfromtype-Iand-II1organicmatterarecalledoil-seriesgases,thosefromtype-III,coal-series,andthosetype-II2,mixture-typegases.Gasesgeneratedfromtwoormorethantwotypesofprecursorsarecalledmixture-sourcegases.Accordingtothosementionedabove,naturalgasesfromthemajoroil-gaspoolsintheSichuanBasinhavebeendiscriminantlyanalyzed,andtheresultsareconcordantwiththedistributionandde-velopmentofhydrocarbon-sourcerocksaswellaswiththeircharacteristics,indicatingaprospectiveapplication.
简介:Oxygenisotopefractionationbetweencoexistingmineralsinslowlycooledrocksconveysinformationabouttheircoolinghistory.Byusingthefastgrainboundary(FGB)modeltosimulateclosed-systemdiffusiveexchangeofoxygenisotopesbetweencoexistingminerals,Ishowthattheapparentequilibriumtemperatures(Tae)bythemineralpairwiththelargestisotopicfractionation(PLIF)alwaysliesbetweentheclosuretemperatures(Tc)ofthosetwominerals.Therefore,whentherateofoxygendiffusionandhenceTcforthePLIFchancetobecomparable(suchasinthecaseofquartzandmagnetite),TaewillserveasagoodapproximationofTcregardlessofvariationinmineralproportions.ThespecialtyofthePLIFinconstrainingTaewithintheirTcrangecanbegeneralizedtootherstableisotopesystemsandelementpartitioning.ByapproximatingTcwithTaeandinvertingDodson'sequation,thecoolingrateofplutonicormetamorphicrockscanbeinferred.
简介:Thispaperderivesthephysicalmeaningsofpeakposition,peakwidthandheightofanX-raydiffractionpeakfromtheanalysesoftheBragg'sequation,theScherrer'sformulaandtheprincipleofpeakintensitycalculation.Thegeometriccharacteristicsofanasymmetricpeakareclarifiedbymeansofexperiment.Therelationshipsbetweenneakshapeanddomainsize/latticestrainhavebeenverifiedbygeologicalevents.Thereforethispaperintegratesthephysicalmeaningsofall5basicparametersforanX-raydiffractionpeak.Applicationsofthese5parame-tersareexemplified.
简介:BiogeochemicalinvestigationofTamarixaphylla,aplantspecies,oftheLas-belaareahasbeenmade.Thisareamainlyconsistsofophiolitesassociatedwithsed-imentaryrocksofJurassicandCretaceousage.QuantitativeestimationsofimportantbiogenictraceelementssuchasFe,Mn,Pb,Zn,Cu,Cr,Ni,andCohavebeencarriedout.Anomalousconcentrationsoftheseelementsinplantspeciesofcertainregionscanbeusedtolocatepossibleoccurrencesoforedepositsinthearea.Thecomparativestrdyalsorevealsappreciablevariationsinthecompositionoftraceelementsinplants.ThepossiblecausesofvariationintheconstitrentsofTamarixaphyllafromdifferentlocalitieshavebeendiscussedinthelightofbedrocknature,mo-bilityofelementandaverageabundanceintheplant.
简介:WithwellsPuguang2and6inthePuguanggasfieldastheresearchobjectsbychoosingorganiccarbonascharacterizationreservoircarbon(indirectlyreflectingthebitumencontents),thispaperdiscussestherelationshipbetweenbitumencontentsandlithologiccharacteristics,reservoircharacteristics,andcalculatesthevolumeofpaleo-oilandoilcrackedgas.Thestudyshowsthattheorganiccarboncontentsofthereservoirsarerelatedtolithologiccharacteristics.Duetovariationsintheparticlesizeorstructureofrocks,theporosityofthereservoirsvaries,furthermore,itwillinfluencethecontentsoforganiccarbon.Andtherelationshipbetweenthesetwoparametersispositive.Basedontheanalysis,therelationshipbetweentotalorganiccarbon(TOC)andthecontentsofreservoirbitumenalsoappearstobepositive.Thevolumeofpaleo-oilandcrackedgasoftheChangxing-Feixian’guanFormationarerespectively495milliontonsand360.4billionm3throughthecalculationofreservoir’sorganiccarbon.Therefore,therelationshipbetweencarbon-bearingrateandcharacteristicsofthereservoirscanbeusedtoindirectlyevaluatereservoirtypes.Besides,thecarbon-bearingrateofthereservoirsalsoreflectsthecontentsofreservoirbitumen,paleo-oilaswellasnaturalgas.Itmakesanewapproachforthestudyofthetypesofreservoirsandtheamountsofpaleo-oilandoilcrackedgasinnortheasternSichuanBasin.