iinthenorthchina
atract
thenorthernpartofchinaisamatchingbodyofdifferentplatesandterrai.thesedimentarybasiinthenorthchinasuperimposeonthedifferentstructuralunitsandhavedifferentstructuralformsanddifferentstructuralevolutionhistory.sincemesozoicthebasihavebeenreformedanddestroyedbymanystructuralmovements.thispaper,directedby“movementtheory”and“stagetheory”ofgeologyevolution,synthesizingregionalgeologysurroundingandbasinevolutionhistory,usingmanypaleogeothermalresearchmethods,resumesthermalhistoryofthebasiinthenorthchina,analyzesandcomparesthedifferentstagesanddifferentunitsthermalgradientsofbasiinthenorthchina,makesasystematicstudyoftherelatiohipbetweenthermalhistoryandoilandgasofdifferentbasiandascertaifavorableunitsandfurtherexplorationfieldofoilandgasexploration.
songliaobasinanderlianbasin,locatedinnortheastofthenorthchina,allofwhicharetypicalriftbasin,havesimilarstructuralevolutionhistory.thepresentgeothermalgradientofsongliaobasinis3.70℃/100m,meanheatflowvalueis68.65mw/m2.thepresentge
othermalfieldofsongliaobasinishighincentre,lowinborderandhascharacteristicofringshapedistribution.researchinvariousmethodsindicatesthatpaleotemperatureofsongliaobasinishigherthanpresent,paleogeothermalgradientinlatercretaceousis5.00-6.00℃/100m,whichisfarmorethanpresentgeothermalgradient.
thestudyonthermalhistoryoferlianbasinisverylittle.thepresentgeothemalgradientoferlianbasinis3.10-4.22℃/100m,themeanvalueofwhichis3.50℃/100m,theestimatedheatflowvalueis56.21-81.59mw/m2,
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