简介:Basedonthermalsimulationexperiment,interactionsbetweenvolcanicfluidsandsourcerockswerestudied.Gasgenerationsinthedrysystemandfluidsystemunderdifferenttemperatureswereanalyzed.Theresultsshowedthatthevarioustypesofsourcerocksaresimilarincomposition,containinggaseousC1-C5hydrocarbons,H2andCO2whosegasyieldsincreasewithincreasingtemperature.ThegasyieldofsourcerocksoftypeisⅠthehighest,followedbytypeⅡ,andthatofsourcerocksoftypeisⅢthelowest,indicatingthattheyieldofhydrocarbongasesisrelatedtotheirhydrocarbongeneratingpotential.AlthoughthegeneratingpotentialoftypeisⅢthelowest,itcanstillberegardedasausefulgassourcewhenitisburieddeeplyenough.Thebasicvolcanicfluidrestrainsthegenerationofgaseoushydrocarbonsindifferenttypesofsourcerocks,butpromotesthegenerationofinorganicgases.
简介:Thispaperderivesthephysicalmeaningsofpeakposition,peakwidthandheightofanX-raydiffractionpeakfromtheanalysesoftheBragg'sequation,theScherrer'sformulaandtheprincipleofpeakintensitycalculation.Thegeometriccharacteristicsofanasymmetricpeakareclarifiedbymeansofexperiment.Therelationshipsbetweenneakshapeanddomainsize/latticestrainhavebeenverifiedbygeologicalevents.Thereforethispaperintegratesthephysicalmeaningsofall5basicparametersforanX-raydiffractionpeak.Applicationsofthese5parame-tersareexemplified.
简介:ThegeochemistryofthebasicvolcanicrocksatthesouthmarginoftheQinlingorogenicbelt(SMQOB)suggeststhattheywereformedinanintraplatetectonicsetting.TheREEdistributionpatternsshowtheserocksarestronglyenrichedinLREEwithhigh∑REE,andtheirtraceelementsgeochemistryissimilartothatofcontimentalfloodbasalt.AlltheaboveevidencesuggeststhattheCaledonianbasicvolcanicrocksintheSMQOBweretholeiiticbasaltsformedinanintraplatespreading-initialrifttectonicsetting.Thecharacteristicsofregionalgeologyandgeochemistryindicatethattherewasanintraplatespreading-rifttectonicsettingbetweentheSouthQinglingblockandtheYangtzeblockintheCaledonianepoch.ThedynamicspreadinginthisdistrictbeganintheEarlyCaledonianandthentheintraplatespreadinginitialriftswereformedintheLateCaledonian.AsaresultofspreadingoftheTethysandgeodynamicprocessesindeepmantle,theMianlue-HuashanoceanicbasinwasformedbetweentheQinlingblockandtheYangtzeblockinDevonian,andtheQinlingmicroplatewasseparatedfromthenorthernpartoftheYangtzeplate.