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1、第34卷第5期石油褒鮐弛屆V01.34.No.52012年9月PETROLEUMGEoLoGY&EXPERⅡENTSep.,2012文章編號:1001—6112(2012)05—0466—08塔里木盆地東北部中上奧陶統(tǒng)致密砂巖儲集性能與成因趙欣,陳強路,孫淵,史政,陳躍(1.長安大學(xué),西安710064;2.中國石油化工股份有限公司石油勘探開發(fā)研究院無錫石油地質(zhì)研究所,江蘇無錫214126)摘要:塔里木盆地東北部中上奧陶統(tǒng)發(fā)育了一套巨厚的砂巖、粉砂巖與泥(頁)巖互層的濁積巖,其勘探前景目益引起人們的關(guān)注。通過對庫魯克塔格露頭系統(tǒng)采樣,詳細研究了中上奧陶統(tǒng)卻爾卻克組砂巖的儲集性和
2、成因。卻爾卻克組砂巖主要為細粒長石砂巖、巖屑砂巖、巖屑長石砂巖和長石巖屑砂巖;長石顆粒、方解石膠結(jié)物的溶蝕孔隙是主要的孔隙空間,孑L隙結(jié)構(gòu)以微小孑L一微細喉道組合類型為主;平均孔隙度1.72%,平均滲透率4.584x10txm,屬于特低孔低滲的儲層。近物源快速沉積作用導(dǎo)致的低成分成熟度和中等一差結(jié)構(gòu)成熟度,是卻爾卻克組致密砂巖形成的內(nèi)在原因;較高的塑性顆粒含量和超補償沉積導(dǎo)致的強烈壓實作用和晚期較強的膠結(jié)作用是儲層物性差的重要因素;較弱的溶蝕作用及破裂作用未能明顯地改善儲層的物性條件,也是形成本組低孔低滲的砂巖儲層的重要原因。關(guān)鍵詞:成因;儲集性;致密砂巖;中上奧陶統(tǒng);塔里木
3、盆地中圖分類號:TEl22.23文獻標(biāo)識碼:APropertyandoriginoftightsandstonesinMiddle-UpperOrdovician,northeasternTarimBasinZhaoXin,ChenQianglu,SunYuan,ShiZheng,ChenYue(1.Chang’anUniversity,Xi’an,Shaanxi710064,China;2.WuxiResearchInstituteofPetroleumGeology,SINOPEC,Wuxi,Jiangsu214151,China)Abstract:Inthenorthe
4、asternTafimBasin,athickset0±turbiditecomposedofsandstone,sihstoneandmud—stone(shale)wasfoundintheMiddleandUpperOrdovician,attractingmoreandmoreattentionsforexplora-tion.ThereservoirpropertyandoriginofsandstonesfromtheQuerquekFormationwerestudiedindetailthroughsystematicsamplingofKuruktagout
5、crops.ThesandstonesfromtheQuerquekFormationmainlyincludedfine-grainedarkose,lithicsandstone,debrisfeldsparandfeldspathielithicsandstone.Thedissolvedporesoffeldsparparticleandcalcitecementworkedasthemainporespace,andtheporestructurewasmainlymicroporeandthroat.Theaverageporositywas1.72%,andth
6、eaveragepermeabilitywas4.584x10~m,indicatingextra.1owporosityandextra-lowpermeabilityreservoir.Thelowcompositionalandmid—poortexturalmaturitiesofsandstoneresultedfromnearsourceandrapiddepositionweretheinherentreasonsfortheformationofQuerquektightsandstone.Theseverecompactionresultedfromultr
7、a-compensation,thehighcontentofplasticparticleandthelateweakdissolutionweretheimportantfactorsforpoorphysicalpropertyreservoir.Theweakdissolutionandfracturingdidnotimprovethephysicalpropertyofreservoirobviously,andweretheimportantreasonsforpoorreservoirw