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1、FormationMechanismandDistributionofPaleogene-NeogeneStratigraphicReservoirsinJiyangDepressionFormationMechanismandDistributionofPaleogene-NeogeneStratigraphicReservoirsinJiyangDepressionAbstractDuringPaleogene-Neogeneperiod,multiplescaleunconformitieshadbeenformedinJiyangdepression,whic
2、hprovidedfavorableconditionsforstratigraphicreservoirs.Inrecentyears,variousPaleogene-NeogenestratigraphicreservoirsinJiyangdepressionhavebeenfound,andprovedreserveswererisingsignificantly,whichfullyshowedagreatexplorationpotentialforthiskindofreservoirs.Butthepracticeofexplorationinrec
3、entyearsindicatedthattheunconformitiescarriersystemanditsabilityofsealing,petroleummigrationanditsaccumulationmodel,distributionofstratigraphicreservoirsareuncertain,whichdeeplyrestricttheexplorationdegreeofstratigraphicreservoirsinJiyangdepression.Basedontheanalysisofalargenumberofexpl
4、orationwellsandseismicdataforTypicalreservoirs,thepaperanalysesunconformitiesconstructanditseffecttogenerationinthePaleogene—Neogene,andsummarizethedistributionpatternofstratigraphicreservoirsbasedonpetroleummechanismandaccumulationmodel.Finally,ahighlyquantitativepredictionmodclofheigh
5、tofpoolsinstratigraphicreservoirswasestablished,theresearchresultseffectivelyguidedtheexplorationPra-cticeofstratigraphicreservoir.TherearefourmacrounconformitytypesofPaleogene—Neogeneformationwhichincludingtruncation-overlap,truncation·parallel,parallel—overlapandparalelunconformityinJ
6、iyangdepression.Besidestruncation-overlapunconformityliesinslopesofdepression,andparallelunconformitydevelopedinsideofdepression,anothertwotypeslieinlocalareas.Unconformitycanbedevelopedverticallythree-layerstructurewhichincludingunconformityroofrock,weatheredclaylayerandsemi-weatheredr
7、ock.ItalsoCanbetwo—layerstructureifwithoutweatheredclaylayer.Andpartofsemi—weatherrockCanbeformahardshellaccuseofitsfillingprocessduringthelaterstage.Geologicalcharacteristicofthestructurelayerofunconformityisdifferentinlithology,mineralogy,elementgeochemistryandweatherdegreein