rmalgradientandheatflowo
fjiudong,huahaiandjiuxibasiareallverylow,ofwhichthepresentgeothermalgradientsare2.51-3.00℃/100mandtheheatflowvaluesare50-57mw/m2.inlatermesozoic,thepaleothermalgradientsofhuahai,jiuxiandjiudongbasin,whichare3.75-4.50℃/100m,areallhigherthanpresentthermalgradients.inhuahaibasinpaleotemperatureishigherthanpresentandthematurityofsourcerockiscontrolledbypaleotemperature.injiuxiandjuidongbasinthematurityofsourcerockismainlycontrolledbypresenttemperature.
tulufanhamibasinisoneofthethreebigbasiinxinjangautonomousregionthepresentgeothermalgradientofitis2.50℃/100mandtheheatflowvalueis44.48mw/m2.thegeothermalgradientofitishighineastandlowinwest.theresumedpaleotemperatureindicatesthatthegeothermalgradientoftulufanhamibasinfromlaterjuraictoearlycretaceousis2.31-3.61℃/100m,themeanofwhichis3.00℃/100m,inearlyandmiddlejuraicthegeothermalgradientislowerthan3.00℃/100m.thestructuralandthermalevolutionofthehamidepreion,taibeidepreionandtuokexundepreioisverydifferent.inhamidepreionandpartsoftuokexundepreionthepaleotemperatureishigherthanthepresentandthestageofoilgenerationisearly.althoughfromlaterjuraictaibeidepreionunderwentashorttimeriseanddenudationbutthetemperaturehavebeenrisingasawhole,whichisbeneficialtooilgenerationandpreservation.badaowanformationandxisanyaoformation,thepresentmainsourcerocks,isatthehighstageofoilgeneration,taibeidepreionisthemostfavorableexplorationarea.theoilandgaspoolsintuloufanhamibasinisformedinmanytimes,whichcanbedividedintothree
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