資源描述:
《塔木察格盆地塔南凹陷熱演化史與油氣成藏期次》由會員上傳分享,免費在線閱讀,更多相關內(nèi)容在行業(yè)資料-天天文庫。
1、2013年2月大慶石油地質(zhì)與開發(fā)Feb..2O13第32卷第1期PetroleumGeologyandOilfieldDevelopmentinDaqingV01.32No.1DOI:i0.3969/J.ISSN.1000—3754.2013.01.012塔木察格盆地塔南凹陷熱演化史與油氣成藏期次馬新海(大慶油田有限責任公司勘探開發(fā)研究院,黑龍汀大慶163712)摘要:塔南凹陷是塔木察格盆地油氣勘探的重要凹陷,但一直以來缺乏對盆地熱演化史和油氣成藏期次的系統(tǒng)研究。為此,采用多種方法對塔南凹陷近百個地層測溫數(shù)據(jù)和330個有機質(zhì)鏡質(zhì)體反射率數(shù)據(jù)進行統(tǒng)計分析,認為塔南凹陷地層溫度隨
2、著深度的增加呈線性增加,為典型的傳導型地溫場特征;早白堊世各組地層沉積時期地溫梯度為4.48℃/hm一5.37℃/hm,均大于現(xiàn)今地溫梯度;早白堊世至今,塔南凹陷地溫場處在一個降溫的過程。同時開展單井熱演化史和生排烴史模擬,認為塔南凹陷地層熱演化程度定型于伊敏組末期;塔南凹陷主力烴源巖在早白堊世末伊敏組時期開始排烴,但該時期排烴量很小,晚白世青元崗組時期(95~70Ma)開始大量排烴,約占烴源巖總排烴量的85%。結合構造、沉積演化分析,厘定晚白世青元崗組為油氣排出烴源巖運移至圈閉聚集成藏的關鍵時期,是塔南凹陷主要油氣成藏期次。關鍵詞:地溫場;熱演化史;生排烴史;成藏期次;塔南
3、凹陷;塔木察格盆地中圖分類號:TEl21.1文獻標識碼:A文章編號:1000-3754(2013)01-0059-06THERMALEVoLUTIoNHISToRYANDSTAGE.TIMEoFPETROLEUMRESERVOIRFoRMATIoNINS0UTHSAGoFTUMTSAGBASINMAXinhai(ExplorationandDevelopmentResearchInstituteofDaqingOilfieldCompanyLtd.,Daqing163712,China)Abstract:SouthTumtsagSagisaveryimportantsagfo
4、roil&gasexplorationinTumtsagBasin.Forquitealongtime,thesystematcresearchesonthegeothermalevolutionhistoryandstage·timeofpetroleumreservoirformationhavenotbeenengaged.Thereforemanymethodsareadoptedtostatisticallyanalyzealmosthundredoftestedgeo—thermaldataand330R。dataoftheorganicmatters.Thest
5、udiesshowthatthegeothemsriselinearlywiththein—creaseofthedepth-thetypicalcharacteristicsoftransmitting—typegeothermalfield;thegeothermalgradientsineachsedimentaryformationofEarlyCretaceoussystemrangedfrom4.48~C/hmto5.37~C/hm,whicharegreaterthanthepresent.FromEarlyCretaceousperiodtonow,thefi
6、eldinSouthTumtsagSaghasexperiencedtheprocessoftemperaturereduction.Atthemeantime,thestimulationsofthehistoriesoftheindividualwellggeothermalevo—lutionandhydrocarbongeneration&expulsionareconducted.TheachievementsprovethatthegeothermalevolutiondegreewasfinishedinthestageofLateYiminFormation;
7、theprimarypetroleumsourcerockinSouthTumtsagSagbegantoexpelhydrocarbonatthestageofYiminFormation(theendofEarlyCretaceousperiod),buttheamount收稿日期:2012-07-24改回日期:2012—10-28基金項目:中同石油天然氣集團公司重點項目(2008ZX05001—001)資助。作者簡介:馬新海,男,1979年生,工程師,碩士,從事井位部署設計和石油地質(zhì)綜合評價工作。