臺北凹陷侏羅系含鐵碳酸鹽膠結(jié)物特征及對致密砂巖儲層的影響

打開文本圖片集

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 網(wǎng)絡(luò)出版地址：http：//link.cnki.net/urlid/51.1718.TE.20240625.1417.004

引言

碎屑巖中含鐵碳酸鹽礦物主要以孔隙充填物和膠結(jié)物的方式出現(xiàn)，其次為“加大”膠結(jié)發(fā)育在白云巖碎屑周邊或者共軸生長于棘皮類等生物碎片上，亦可作為結(jié)核、脈體等產(chǎn)出于頁巖、粉砂巖及粉砂質(zhì)頁巖中，其形成及發(fā)育環(huán)境復(fù)雜[1-3]。（剩余23758字）