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1、第36卷第4期新疆石油地質(zhì)Vol_36.No.42015年8月XINJIANGPETR0LEUMGE0LOGYAug.2015文章編號(hào):1001—3873(2015)04—0379—06DOI:10.7657/XJPG20150401準(zhǔn)噶爾盆地瑪湖凹陷高成熟油氣成因與分布阿布力米提,曹劍27陳靜,楊海波1,陳岡0強(qiáng)17陶柯宇(1.中國(guó)石油新疆油田分公司勘探開發(fā)研究院,新疆克拉瑪依834000;2.南京大學(xué)地球科學(xué)與工程學(xué)院,南京210023)摘要:致密儲(chǔ)集層中的油氣是否高熟輕質(zhì),對(duì)于油氣的富集與高產(chǎn)至關(guān)重要。對(duì)準(zhǔn)噶爾盆地瑪湖凹陷高熟輕質(zhì)油氣的基本特征、成因與分布規(guī)律的研究
2、結(jié)果表明,研究區(qū)高熟輕質(zhì)油氣具有原油密度較輕、成熟度較高、與天然氣共生等特征,屬于以下二疊統(tǒng)風(fēng)城組優(yōu)質(zhì)烴源巖為主的多套烴源巖接近高成熟演化階段的產(chǎn)物。在成藏過(guò)程中,高熟輕質(zhì)油氣藏的油氣連續(xù)充注、保存好,未受降解破壞;高成熟油氣的分布具有“源控”特征,垂向上因斷裂溝通可以跨層運(yùn)聚,分布區(qū)域廣,是瑪湖大油氣區(qū)得以形成的重要條件。關(guān)鍵詞:準(zhǔn)噶爾盆地;瑪湖凹陷;百口泉組;風(fēng)城組;優(yōu)質(zhì)烴源巖;連續(xù)型油氣藏;高成熟油氣;輕質(zhì)油中圖分類號(hào):TEl12.422文獻(xiàn)標(biāo)識(shí)碼:AOriginandOccurrenceofHighlyMaturedOilandGasinMahuSag,Jungg
3、arBasinAbulimiti,CAOJian,CHENJing。,YANGHaibo,CHENGangqiang,TAOKeyu(1.ResearchInstituteofExplorationandDevelopment,XinjiangOilfieldCompany,PetroChina,Karamay,Xinjiang834000,China;2.SchoolofEarthSciencesandEngineering,NanjingUniversity,Nanjing,Jiangsu210023,China)Abstract:Whethertheoilandga
4、sarehighlymaturedandlightiscriticaltohydrocarbonenrichmentandhighyieldindensereservoirs.Thispaperinvestigatesthebasiccharacteristics,originandoccurrencerulesofhighlymaturedandlightoilandgasinMahusag,northwest—ernJunggarbasin.Resuhsshowthatthehighlymaturedandlightoilandgasinthestudyareaare
5、characterizedbylowdensity,highmatu-rityandcoexistencewithnaturalgas,whichbelongtotheproductsofmulti—setsourcerocksdominatedbytheLowerPermianFengchenghigh—qualitysourcerockundernearly—highmaturationstage.Duringthehydrocarbongeneration,migrationandaccumulation,thehighlymaturedandlightoiland
6、gasreservoirgotcontinuousoil·gaschargingandgoodpreservationwithoutorwithlittlebiodegradation;theoccur-renceofthemischaracterizedbysourcecontrolling,andtheycanmigrateandaccumulateincross—zoneandbroadareasverticallybyfaultsandfractures,whichmightbeimportantconditionsforformingMahugiantpetro
7、leumprovinceinJunggarbasin.KeyWords:Junggarbasin;Mahusag;Baikouquanformation;Fengchengformation;high-·qualitysourcerock;continuouslychargingreser·-voir;highlymaturedhydrocarbon;lightoil油氣成藏與富集是油氣流體與巖石固體格架相互面積的源外“連續(xù)型”油藏[11-121(圖1)。分析資料表耦合作用的結(jié)果,因此,若油氣密度較輕,甚至是以氣明,這一帶有相