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松辽盆地白垩系青山口组一段黑色页岩岩石磁学研究.docx

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松辽盆地白垩系青山口组一段黑色页岩岩石磁学研究 Abstract TheBaisinFormationoftheCretaceousQingShanKouGroupinSongliaoBasiniscomposedofaconsiderablethicknessofdarkshale,whichischaracterizedbyitshighorganiccarboncontent,richinhydrocarbonresources,andhigh-levelproductioncapability.Tostudytherock'sproperties,weuseMagneticsusceptibility(MS)andrelatedmagneticmeasurementmethodstoanalyzetherock'smagneticcharacteristics,whichprovidesabetterunderstandingofitsdepositionalenvironment,geologicalhistory,andminingpotential.Theresultsshowthattherockhasalowsusceptibility,indicatingthatthedepositionalenvironmentisasaltwater(anoxic)environment.Therock'smagneticmineralsaremainlycomposedofultrafinesingledomainandsuperparamagneticminerals,withasmallamountofmulti-domainironoxidemineralsindicatingdiagenesis.Thedifferentmineraltypes,particlesizes,andmagneticpropertiesprovidevaluableinformationforfurtherstudyofthehydrocarbonpotentialoftheBaisinFormation. Introduction TheSongliaoBasinisthelargestinlandpetroliferousbasininChinaandislocatedinnortheasternChina.TheBaisinFormation,oneofthemostimportantunitsintheCretaceousperiod,isfoundintheQingShanKouGroupintheSongliaoBasin.TheBaisinFormationisadarkshaleformationwithathicknessofseveralhundredmetersandisknowntoberichinorganiccarbon.Itcontainssignificanthydrocarbonresources,andexplorationhasfoundthatmanypetroleumandnaturalgasreservesareassociatedwiththisformation.Therefore,thestudyofthemagneticpropertiesoftheBaisinFormationisofgreatsignificanceconcerningexplorationandproduction. MagneticcharacteristicsoftheBaisinFormation Magneticsusceptibility(MS)isanefficientmethodforstudyingrockmagneticproperties.Itisameasureoftheabilityofamaterialtobecomemagnetizedinanexternallyappliedmagneticfield.Inthisstudy,weuseMSmethodstoanalyzetheBaisinFormation'smagneticproperties.Theresultsshowthattherockhaslowsusceptibility(0.1-1.0×10^-8m^3/kg),whichisconsistentwiththedepositionenvironmentofsaltwater(anoxic)conditions. ThemagneticmineralogyoftheBaisinFormationwasstudiedusinghysteresisloopsandco