乐安油田草4块沙四段储层沉积特征与非均质性研究.pdf

2007年第31卷中国石油大学学报(自然科学版)Vol.31No.3
第3期JournalofChinaUniversityofPetroleumJun.2007

文章编号:167325005(2007)0320007206

乐安油田草4块沙四段储层沉积特征与非均质性研究

王友净,林承焰,董春梅,薛玖火

(中国石油大学地球资源与信息学院,山东东营257061)

摘要:储层沉积特征和非均质性已成为制约边际稠油油藏开发生产的瓶颈。利用地震、钻井、测井、岩心资料,对乐
安油田草4块沙四段储层的沉积特征与非均质性及其对稠油开发的影响进行了研究。结果表明,研究区草4块沙四
段发育两个三级层序,其岩石矿物学特征不同,沉积特征明显不同,含油性也不同;沙四上亚段为滨浅湖滩坝相沉
积,而沙四下亚段为近岸水下扇沉积,其控制着95%的储量。储层渗透率变异系数为0161～1143,突进系数为2121
～5141,渗透率级差大,层内、层间非均质性强,平面上非均质性相对较弱。综合评价出了有利的开发层段,其中沙四
段4砂层组的3,4小层为有利开发层段,油层分布稳定,连通性好,可采用小井距强化注水面积井网或蒸汽吞吐热采
开发,并采取适当的防砂措施。
关键词:乐安油田;草4块;沙四段;沉积特征;非均质性
中图分类号:TE122.23文献标识码:A

Reservoirsedimentarycharacteristicsandheterogeneityofblock
Cao4,member4ofShahejieformationinLeanOilfield

WANGYou2jing,LINCheng2yan,DONGChun2mei,XUEJiu2huo

(FacultyofGeo2ResourceandInformationinChinaUniversityofPetroleum,Dongying257061,ShandongProvince,China)

Abstract:Reservoirsedimentarycharacteristicsandheterogeneitybecomethebottleneckrestrictingtheproductionofmar2
ginalheavyoilreservoir———blockCao4inLeanOilfield.Thesedimentarycharateristicsandheteyogeneityandtheireffects
onthedevelopmentofheavyoilreservoirwereanalyzedbythedataofseismic,drilling,loggingandcore.Theresultsshow
thatmember4ofShahejieformationinblockCao4ofLeanOilfielddevelopstwosequences,whichhavedifferentlithology
minerals,sedimentcharactersandoilpotentials.Theupperpartofmember4ofShahejieformationdevelopsbeachandbar
facies,butthelowerpartdevelopssubmarinefan.Thereservesofthelowerpartaccountsfor95%.Thereservoirpermeabili2
tyvariationcoefficientis0.61-1.43;theonrushcoefficientis2.21-5.41;thepermeabilityratioislarge.Theheterogene2
ityofinternallayerandbetweenlayersishigh,butinhorizonitisrelativelyweak.The3thand4thlayerofthe4thsandstone
grouparethepreferablelayers,whichdistributestablyandhavegoodconnectivity.Thoselayerscanadoptenhancedlittle
well2spacingwaterfloodingareawell2patternorsteamingsoakingtodevelopandapplyappropriatesandcontrolmeasure.
Keywords:LeanOilfield;blockCao4;member4ofShahejieformation;sedimentarycharacteristics;heterogeneit