Paleogene Tectonic Evolution Controls on Sequence Stratigraphic Patterns in the Fushan Sag, Northern South China Sea-中国Betway体育网页登陆

摘要 Tectonismisofextremeimportancetosequencestratigraphicpatternsincontinentalsedimentarybasins,affectingboththearchitecturesandinternalmakeupofsequences.SequencestratigraphicframeworkofthePaleogenesystemintheFushansag,northernSouthChinaSea,wasbuiltusing3Dand2Dseismicdata,complementedbydrillingcoresandwelllogsdata.Onefirst-order,threesecond-orderandseventhird-ordersequenceswereidentified.Analysisofpaleotectonicstressfield,unconformitiesandsubsidencehistoryshowedthatthePaleogenetectonicevolutionpresentedsignificantcharacteristicsofmultistageandepisode,andcanbedividedintothreestages:riftingstageI(initialriftingperiod),riftingstageII(rapidsubsidenceperiod),riftingstageIII(fault-depresseddiversionaryperiod).Partitionofthewestandeastintectonicactivitywasobvious.Thewestareashowedrelativelystrongertectonicactivitythantheeastarea,especiallyduringtheriftingstageII.Episodicriftingandlateralvariationsintectonicactivityresultedinawidevarietyofstructuralslopebreakbelts,whichcontrolledboththesequencearchitecturesandintervalmakeup,andstronglyconstrainedthedevelopmentofspecialfacieszonesorsandbodiesthattendedtoformhydrocarbonaccumulation.ThispaperclassifiesthegenetictypesofslopebreakbeltsandtheirrelevantsequencestratigraphicpatternswithintheFushansag,andfurtherdiscussesthetectonicevolutioncontrolsonsequencestratigraphicpatterns,whichsuggeststhatverticalevolutionpathsofstructuralslopebreakbeltsandrelevantsequencestratigraphicpatternsasaresponsetothePaleogenetectonicevolutionwerestronglycontrolledbysagmargintypesandlateralvariationsoftectonicactivity.

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Paleogene Tectonic Evolution Controls on Sequence Stratigraphic Patterns in the Fushan Sag, Northern South China Sea

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