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1、SEDIMENTARYGEOLOGYELSEVIERSedimentaryGeology102(1996)23-32AseismostratigraphicanalysisofLowerCretaceousdepositsinthenorthernpartoftheWestSiberianBasinN.Ya.Kunin,I.E.SegalovichInstituteofPhysicsoftheEarth,Acad.Sci.ofRussia,10B.Gruzinskaya,Moscow123810,Russ
2、iaReceived14July1993;revisedversionaccepted7March1994AbstractResultsofaseismostratigraphicanalysisofthenorthernpartoftheWestSiberianBasinarepresented.Athree-dimensionalsedimentologicalandstratigraphicmodelhasbeenconstructed.Themodeldescribestheaccumu-lati
3、onofLowerCretaceousclinoforms.LowerCretaceousclinoformsintheGydanareaareseparatefromtheclinoformgroupstothesouth.Thestratigraphicrelationshipbetweenthisclinoformgroupandthoseofmoresouthernareasarediscussed.NorthernareasoftheWestSiberianBasinweresedimentst
4、arvedfromtheLateJurassictilltheBarremianandduringthistimeacondensedsectionwasdeposited(BazhenovShales).TheseareoverlainbyprogradingterrigenousdepositsinclinoformfaciesandofBarremianage.I.IntroductionCretaceousdepositsoftheWestSiberianBasin(PetersonandClar
5、ke,1991).MostoilfieldshaveTheGydanPeninsulaandtheareabetweenbeendiscoveredinthemiddleObarea(Fig.1).theYeniseyandPyasinariversinthenorthernProspectingandexplorationduringthelastpartoftheWestSiberianBasin(Fig.1)havedecadehaveshownthepresenceofimportantoilgr
6、eatpotentialforhydrocarbondiscoveries.Base-accumulationsintheLowerCretaceousdepositsmentisatgreatdepthandthepresenceofthickoftheUrengoyupliftandothermoresouthernsuccessionsofJurassicandCretaceousdepositsregions(Fig.1).IntheGydanPeninsulaandinhavebeenshown
7、bydrillingatLodochnaya,theareabetweentheYeniseyandPyasinarivers,Suzunskaya,Tampeyskaya,Dolganskaya,Semio-mainlygashasbeenfoundinLowerCretaceousnovskaya,Noskovskaya,Oziornaya,Deriabin-strata.skaya,Khabeyskayaandotherareas(Fig.2).HereDuringthelastdecadeweha
8、vebeencarryingaconsiderableamountofregionalandresearchoutaseismostratigraphicanalysisofCDPdataCDPseismicreflectionstudieshavebeenob-overWestSiberiaandadjacentareas,aimedattained,mainlybytheexplorationorganizationscr
