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1、第36卷第4期石油褒爵他屆Vo1.36.No.42014年7月PETR0LEUMGEoLOGY&EXPERIMENTJu1.,2014文章編號(hào):1001-6112(2014)04—0450—09doi:10.11781/yydz201404450費(fèi)爾干納盆地超深層油氣成藏系統(tǒng)徐洪,楊玉峰(中國(guó)石油天然氣勘探開(kāi)發(fā)公司,北京100034)摘要:費(fèi)爾干納盆地中央地塹帶新生界中普遍發(fā)育超高壓異常。其與構(gòu)造擠壓環(huán)境、快速沉降不均衡壓實(shí)以及持續(xù)的生烴作用有關(guān)。這種超高壓環(huán)境對(duì)深層油氣的生成、聚集成藏產(chǎn)生了重要的影響。主要目的層新近系埋深超過(guò)5000
2、m,仍以液態(tài)烴產(chǎn)出,深層高孔高滲類砂巖儲(chǔ)層是河道砂巖在超高壓環(huán)境下未經(jīng)正常壓實(shí)形成的,表現(xiàn)為取心收獲率低、生產(chǎn)過(guò)程中易出砂的特征;而低孑L高滲類儲(chǔ)層與高壓形成的水力破裂裂縫有關(guān)。古近系碳酸鹽巖儲(chǔ)層中高含硫化氫氣體來(lái)源于TSR反應(yīng),TSR作用使含石膏碳酸鹽巖儲(chǔ)層物性得到了顯著的改善.其油層組壓力系數(shù)稍低于新近系油層組是重?zé)N類氣體損耗、儲(chǔ)集空間增大兩方面因素疊加的結(jié)果。中央地塹帶主要目的層成藏系統(tǒng)劃分為上部E—EN系統(tǒng)和下部JK—E系統(tǒng);上部高產(chǎn)儲(chǔ)層主要受河道砂巖和超高壓控制,下部高產(chǎn)層主要受溺湖相的含石膏碳酸鹽巖儲(chǔ)層控制,2個(gè)含油氣系統(tǒng)的
3、壓力、流體性質(zhì)均有較大的差別,適宜于分層開(kāi)采。關(guān)鍵詞:異常高壓;深層;油氣成藏系統(tǒng);費(fèi)爾干納盆地中圖分類號(hào):TE122.3文獻(xiàn)標(biāo)識(shí)碼:AUltra—-deeppetroleumaccumulationsystemsinFerganaBasinXuHong,YangYufeng(ChinaNationalOil—GasExploration&DevelopmentCorporation,Beijing100034,China)Abstract:InthecentralgrabenzoneoftheFerganaBasin,overpres
4、sureswerewidespreadduringCenozoic,whichmightberelatedtotectoniccompressionenvironment,disequilibriumcompactioncausedbyquicksedi—mentationandcontinuoushydrocarbongeneration.Theultra—highpressureenvironmenthadimportanteffectsondeepoilandgasgeneration,migrationandaccumulati
5、on.Themainreservoirswereburiedover5000mdeepinNeogene,andmainlygavebirthtoliquidhydrocarbons.Thehigh—porosityandhigh—permeabilitysandstonereser-voirsindeepformationscamefromfluvialsandstonesunderultra—highpressure,andwerefeaturedbylowcoringrecoveryrateandhighsandproductio
6、n.Thelow—porosityandhigh—permeabilityreservoirswererelatedtohydrau—licfracturescausedbyhighpressure.InthecarbonatereservoirsinPaleogene,H2Swasinhighcontent,mainlygeneratingfromthermochemiealsulfatereduction(TSR),whichobviouslyimprovedthephysicalpropertyofgYP—sumcarbonate
7、reservoirs.TheformationpressurecoeficientwasslightlylowerthanthatofNeogene,whichcouldbeexplainedbyheavyhydrocarbongaslossandreservoirspaceincrease.Themainpetroleumsystemsinthecen-tralgrabenzonecanbedividedintotheupperE—E3NsystemandthelowerJK—E卜2system.High—productionrese
8、rvoirsoftheupperE—E3Npetroleumsystemarecontrolledbychannelsandstonesandoverpressure,whilethoseofthelowe