第48卷第2期2023年2月Vol.48No.2Feb.2023地球科学EarthSciencehttp://www.earth‐science.nethttps://doi.org/10.3799/dqkx.2022.497渤海海域莱州湾凹陷沙三段水道型湖底扇发育特征与沉积模式官大勇，杜晓峰，王启明，王志萍中海石油（中国）有限公司天津分公司，天津300459摘要：基于已钻井、测井和三维地震资料，分析了莱州湾凹陷沙三段水道型湖底扇砂体的沉积特征，并探讨其成因及发育模式.研究区沙三中亚段早期砂体成因为湖底扇沉积，并表现出水道型特征，可划分为叠覆型水道及其侧翼、复合型水道及其侧翼和单一水道及水道间等沉积微相类型.顺源条带状展布的叠覆型水道和复合型水道构成湖底扇骨架砂体.湖底扇水道类型和规模受控于物源富砂程度、同沉积断裂坡折带类型和古地貌变化.其中，物源富砂程度决定了湖底扇外部形态，同沉积断裂坡折带类型和古地貌变化进一步控制湖底扇发育位置和水道规模及其类型.水道型湖底扇具有近油源、储盖组合良好和油气运聚条件优越等特点，是岩性油气藏勘探的重要目标.关键词：湖底扇；水道；沉积特征；发育模式；沙三段；莱州湾凹陷；渤海海域；石油地质.中图分类号：P631文章编号：1000-2383(2023)02-503-14收稿日期：2022-11-26DevelopmentCharacteristicsandSedimentaryModelofSublacustrineFanofChannelTypeintheThirdMemberofShahejieFormationintheNorthernLaizhouBayDepression,BohaiSeaAreaGuanDayong，DuXiaofeng，WangQiming，WangZhipingTianjinBranch，CNOOC（China）Co.，Ltd.，Tianjin300459，ChinaAbstract:Basedonthewell‐drilled,wellloggingand3Dseismicdata,thesedimentarycharacteristicsofsandbodiesinthethirdmemberofShahejieformationinLaizhouwansagwereanalyzed,andthegenesisanddevelopmentmodelwerediscussed.TheresultsshowthatthesandbodiesintheearlymiddlememberofthethirdmemberofShahejieformationinthestudyareaareformedbysublacustrinefandeposits,whichshowchanneltypecharacteristics.Thesublacustrinefandepositscanbesubdividedintosedimentarymicrofaciestypessuchassuperimposedchannelanditsflanks,compoundchannelanditsflanks,singlechannelandinterchannel.Sublacustrinefanframeworksandbodyiscomposedofsuperimposedchannelandcompoundchannel.Thetypeandscaleofthewaterwayfromsouthtonortharecontrolledbythedegreeofprovenanceandsandenrichment,thetypeo...
