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时间:2020-03-28
《塔里木盆地东北部中上奥陶统致密砂岩储集性能与成因.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第5期石油褒鲐弛届V01.34.No.52012年9月PETROLEUMGEoLoGY&EXPERⅡENTSep.,2012文章编号:1001—6112(2012)05—0466—08塔里木盆地东北部中上奥陶统致密砂岩储集性能与成因赵欣,陈强路,孙渊,史政,陈跃(1.长安大学,西安710064;2.中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所,江苏无锡214126)摘要:塔里木盆地东北部中上奥陶统发育了一套巨厚的砂岩、粉砂岩与泥(页)岩互层的浊积岩,其勘探前景目益引起人们的关注。通过对库鲁克塔格露头系统采样,详细研究了中上奥陶统却尔却克组砂岩的储集性和
2、成因。却尔却克组砂岩主要为细粒长石砂岩、岩屑砂岩、岩屑长石砂岩和长石岩屑砂岩;长石颗粒、方解石胶结物的溶蚀孔隙是主要的孔隙空间,孑L隙结构以微小孑L一微细喉道组合类型为主;平均孔隙度1.72%,平均渗透率4.584x10txm,属于特低孔低渗的储层。近物源快速沉积作用导致的低成分成熟度和中等一差结构成熟度,是却尔却克组致密砂岩形成的内在原因;较高的塑性颗粒含量和超补偿沉积导致的强烈压实作用和晚期较强的胶结作用是储层物性差的重要因素;较弱的溶蚀作用及破裂作用未能明显地改善储层的物性条件,也是形成本组低孔低渗的砂岩储层的重要原因。关键词:成因;储集性;致密砂岩;中上奥陶统;塔里木
3、盆地中图分类号:TEl22.23文献标识码: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
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