PAGE\*MERGEFORMAT49摘要本文在广泛阅读国内外有关膏盐岩发育对油气成藏影响的研究文献、资料的前提下，分析东营凹陷古近系盐膏岩地层的发育和分布情况，研究盐膏岩层系的成因模式和分布特征，总结膏盐岩地层及其分布特征对油气成藏的影响。东营凹陷孔一段上部、沙四段下部一、二套，沙四段上部共发育4套膏盐层，不同时期膏盐岩的沉积中心及沉积厚度随着盐湖的演化有所变化，具有迁移性特征。由于膏盐岩特殊的热性质，膏膏盐层下部烃源岩热演化趋势减缓，而在膏膏盐层上表面附近烃源岩的各热演化指标均呈现出一个跳跃。盐膏岩地层会使下伏地层中形成异常压力，有利于储层孔隙保存和次生孔隙的形成，其强导热性会造成盐下地层热量散失较快，延缓储层成岩作用的演化。此外，膏盐在深层脱水引起溶蚀作用，有利于次生孔隙形成。一般情况下，膏盐层可作为优质盖层，但也并非绝对。深断层可以切穿强塑性和流动性的膏盐层从而沟通膏盐层上下两个含油气系统，盐下的高压流体沿着泄压通道（断层）上涌，同时由于膏盐层本身具有可塑性特点，可以形成盐拱、底辟等多种构造，因此，这些高压流体可以在上部地层的一系列由盐构造运动形成的圈闭中聚集。关键词：东营凹陷；膏盐岩；油气成藏ABSTRACTThispaperprimarilystudiedthedistributioncharacteristicsandtheevolutionalmodelofsaltandgypsumrocksinDongyingdepression,andthentherelationshipbetweenhydrocarbonaccumulationandthedistributionofsaltandgypsumrockshasbeensummedupafterreadingawiderangeofdocumentsaboutthesaltandgypsumrocklayersandtheresearchonhydrocarbonaccumulation.TherearefoursaltandgypsumrocklayersinDongyingdepression.ThatistheupperpartoftheFiistMemberoftheKongdianFormation,firstandsecondofthelowerforthmemberofShahejieformationandtheupperforthmemberofShahejieformation.depocenterandthicknessofgypsumrockschangewithevolutionofsaltlake,whichindicatedthatitmigratedbreadthwise.Becauseofthespecialthermalpropertiesofgypsumsaltrock,thethermalevolutionsourcerocksinthelowerofgypsum-saltbedissloweddown.However,allthermalevolutionindicesoforganicmatterofsourcerocksneartheupperofgypsum-saltbedpresentedajump.Theexistenceofgypsum-saltbedmakesabnormalhighpressureformationintheunderlyingstrataandgoodthermalconductivityofgypsum-saltbedmakegeothermalofthestratainthelowerofgypsum-saltbedloosewithrapidpace,whichisAdvantageoustothepreservationofthereservoirporesandtheformationofreservoirsecondarypore.Atthesametime,itslowdownreservoirdiagenesis.Inaddition,dehydrationofsaltandgypsumrocksmayleadtodissolutionofreservoir,whichisadvantageoustotheformationofreservoirsecondarypore.Normally,gypsum-saltbedcanbeascaprock,butitisnotabsolute.gypsum-saltbedcanbepiercedthroughbyabyssalfaultsandtwopetroleumsysteml