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1、第36卷第3期石油窈劈沾屆Vo1.36.No.32014年5月PETRoLEUMGEoLoGY&EXPERIMENTMay,2014文章編號:1001—6112(2014)03-0291-08doi:10.11781/sysydz201403291蘇里格氣田蘇77區(qū)塊特低滲儲層成巖相識別及分布規(guī)律研究宮雪,沈武顯,李文厚,王若谷(1.西北大學(xué)地質(zhì)學(xué)系大陸動力學(xué)國家重點(diǎn)實(shí)驗(yàn)室,西安710069;2.西安石油大學(xué)地球科學(xué)與工程學(xué)院,西安710065)摘要:蘇里格氣田蘇77區(qū)塊中二疊統(tǒng)石盒子組盒_F亞段沉積時期辮狀河道發(fā)育,儲層巖性以巖屑石英砂巖、巖屑砂巖為主。儲層經(jīng)歷了壓實(shí)、壓溶、
2、自生礦物膠結(jié)以及后期溶蝕作用,大部分已進(jìn)入中成巖B期,達(dá)到低孑L一特低滲儲層級別。根據(jù)主要的成巖礦物、填隙物、成巖作用及孑L隙組合,將盒。下亞段儲層按照儲集性能的優(yōu)劣劃分為石英加大溶孔相(I)、黏土礦物充填晶間孑L相(Ⅱ)、碳酸鹽礦物膠結(jié)相(Ⅲ)和壓實(shí)壓溶致密相(Ⅳ)4類成巖相帶。其中I類成巖相為有利儲集相,Ⅱ類成巖相儲集性能次之,Ⅲ、Ⅳ類成巖相屬于較差儲集巖相。根據(jù)不同成巖相的測井響應(yīng)特征可以識別出成巖相的同心、側(cè)變和互層三類組合模式。關(guān)鍵詞:伊利石化;成巖相;特低滲儲層;組合模式;蘇77區(qū)塊;蘇里格氣田中圖分類號:TEl22.2文獻(xiàn)標(biāo)識碼:ADiageneticfacies
3、identificationanddistributionstudyofultra—lowpermeabilityreservoirinSu77blockofSuligeGasFieldGongXue,ShenWuxian,LiWenhou,WangRuogu(1
4、StateKeyLaboratoryofContinentalDynamics,DepartmentofGeology,NorthwestUniversity,Xi’an,Shaanxi710069,China;2.SchoolofEarthSciencesandEngineering,Xi"anShiyouUniv
5、ersity,Xi’an,Shaanxi710065,China)Abstract:Braidedchannelsdevelopedwellinthelowerpart0{the8thmemberofmiddlePermianShiheziFor—marioninSu77blockofSuligeGasField.Lithicquartzsandstoneandlithicsandstonearethemainlithologyofreservoir.Aftercompaction,pressuresolution,authigenicmineralcementationand
6、laterdissolution,mostofre—servoirsthatarelowporosityandultra—lowpermeabilityoneshaveenteredmiddlediageneticstageB.Accordingtothemaindiageneticminerals,fillings,diagenesisandporecombination,reservoirsofthelowerpartofthe8thmemberofmiddlePermianShiheziFormationaredividedinto4diageneticfaciesasf
7、ollowed:I.quartzover-growthanddissolvedporefacies;Ⅱ.claymineralsfillingandintergranularporefacies;11.carbonatemineralscementationfacies:1V.compactionandpressuredissolutiondensefacies.FaciesIarethebestreservoirsandfaciesIIaresecond—bestones.Facies111andIVarepoorreservoirs.Accordingtologgingfa
8、cies,diageneticfaci—esarecombinedasconcentricpattern.1ateralvariationpatternandcross.1ayerpattern.Keywords:illitization;diageneticfacies;ultra—lowpermeabilityreservoir;combinationpattern;Su77block;SuligeGasField蘇77區(qū)塊上古生界盒段儲層巖性致密,具呈Ⅱ期加大,起到了很好的抗壓實(shí)作用: