台北凹陷侏罗系含铁碳酸盐胶结物特征及对致密砂岩储层的影响
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Characteristics of Iron-bearing Carbonate Cements and Its Impact on Tight Sandstone Reservoirs in the Jurassic of the Taibei Sag
LINTong1*，ZHAO Zhenyu1，WUChao²，ZHANGHua²
1.Research InstituteofPetroleum ExplorationandDevelopment，PetroChina，Haidian，BeijingOoo83，China 2.Research InstituteofExploration&Development，TuhaOilfieldCompany，PetroChina，Hami，Xinjiang 39009，China
Abstract：TheclasticrocksintheMiddle-LowerJurassiccoalstratameasuresare importanttargetforoilandgas exploration anddevelopmentinTaibeiSag，Turpan-HamiBasin.Iron-bearingcarbonate mineralsarewildlydistributedandthereservoir heterogeneityisstrong.Inaddition，therearesignificant diferencesofoilandgasaccumulationindifferentareas.Using variousanalysis testing.Wemakeasystematicstudyonthecarbonate mineralsand parageneticmineral inthereservoirsand clarifythemaincausesofreservoirheterogeneity.Thestudyshows thattheporsarefilledbycarbonateminerals todifrent extent，leading tothedecreaseofreservoirporosityandtheenhancementofheterogeneityreservoir.Themineralasemblage anddistributionareaffectedbythethickne，grainsizeandcompositionofsandstonerelatedtosdimentation.Thesandstone grainsizeofunderwaterdistributarychannelofbraidedriver inQiudong Depresion is thick，coarse withcomplexdebrisand matrixcontentispoor.Thesandstoneofunderwaterdistributarychannelofbraidedriverin Shengbei Depressionisof thinthickness，offine grains withhighcontentofplasticdebrisand matrix.Complexclasticcomponentsand highmatrixcontent insandstonelaythematerialfoundation forthe formationofiron-bearingcarbonate minerals.Therock textureandquantityof organicmaterinsedimentsdeterminethediageneticevolutionarypathofreservoirsindiferentintervals，andfurtherleadto the spatial and temporal disparities of the mineral assemblage associated with iron carbonates.
vords：TaibeiSag;Jurassic;iron-bearingcarbonate;tightsandstonereservoir;SangongheFormation;XishanyaoForm 网络出版地址：http：//link.cnki.net/urlid/51.1718.TE.20240625.1417.004
引言
碎屑岩中含铁碳酸盐矿物主要以孔隙充填物和胶结物的方式出现，其次为“加大”胶结发育在白云岩碎屑周边或者共轴生长于棘皮类等生物碎片上，亦可作为结核、脉体等产出于页岩、粉砂岩及粉砂质页岩中，其形成及发育环境复杂[1-3]。（剩余23758字）