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1、第33卷第2期世界地質(zhì)Vol_33No.22014年6月GLOBALGE0L0GYJun.2014文章編號:1004—5589(2014)02—0439—09海拉爾盆地貝爾凹陷油氣成藏模式與有利勘探方向白雪峰夫慶油田有限責(zé)任公司勘探開發(fā)研究院,黑龍江大慶163712摘要:貝爾凹陷是海拉爾盆地富油凹陷之一,油氣資源豐富,受多期構(gòu)造運動改造,油氣成藏條件復(fù)雜。研究表明,貝爾凹陷經(jīng)歷了“早、中、晚”三期成盆及南屯組末、伊敏組末兩期改造的構(gòu)造演化過程。每期“成盆與改造”對油氣成藏起著關(guān)鍵性作用。有效烴源巖控制了油氣分布范圍;縱向上發(fā)育三套儲蓋組合。南屯組自生自儲型組合為主要勘探層系;發(fā)育緩
2、坡反向斷階帶、復(fù)式箕狀斷陷間的斷裂隆起帶及保存條件好的小深洼槽三種成藏模式。油氣成藏主控因素及富集規(guī)律的認(rèn)識明確了貝西斜坡帶南部、蘇德爾特構(gòu)造帶南部及貝東洼槽群為下步重點勘探方向。關(guān)鍵詞:海拉爾盆地;貝爾凹陷;構(gòu)造改造;富集規(guī)律;勘探方向中圖分類號:P618.130.2文獻標(biāo)識碼:Adoi:10.3969/j.issn.1004-5589.2014.02.021HydrocarbonaccumulationmodelsandfavorableexplorationtargetsinBeierdepression,HailaerBasinBAIXue—fengExploration&
3、DevelopmeritResearchInstituteofDaqingOilfieldCompanyLtd.,Daqing163712,Heilongfiang,ChinaAbstract:Beierdepressionisoneofthemostpromisingoil—bearingareasinHailaerBasinwithabundanceofoilandgasresources.However,thereservoirformingconditionswerecomplicatedduetomulti—periodtectonicstructuraltransfor
4、mation.ResearchessuggestedthatBeierdepressionhadexperiencedthree—phasesinbasinforma-tion,andtwo—periodtectonictransformations(byendoftheNantunFormationandbyendofYiminFormation),whichplayedkeyrolesintheprocessofhydrocarbonaccumulation.Thesourcerockscontrolledthedistributionofoilandgas.Verticall
5、y,therewerethreesetsofreservoir-sealassemblages,whileNantunFormation,withitsinher-enthydrocarbongenerationandaccumulationconditions,wasthemajorformationforexploration.Therewerethreehydrocarbonaccumulationmodels,thegentlyslopingantitheticfaultbench,theupliftzonebetweenduplexhalf-grabenfaultdepr
6、essions,andsmalldeepsub—sagswhichprovidedgoodpreservationconditions.UnderstandingsonthecontrollingfactorsandrulesofhydrocarbonaccumulationprovidedfavorableexplorationtargetsofthesouthofBeixislapebeltthesouthofSudee~estructuralbeltandsagsofBeidongzone.Keywords:HailaerBasin;Beierdepression;struc
7、turaltransformation;accumulationrules;explorationtar—get西緣,是一個典型的晚中生代斷陷盆地群。貝爾凹0引言陷是該盆地南部的一個次級構(gòu)造單元,其東北部與海拉爾盆地位于中國東北大興安嶺巖漿巖帶的烏爾遜凹陷相接,西部以磋崗隆起為界,東南部與收稿日期:2013-09-23;改回日期:2014-02-26基金項目:中國石油天然敢股份有限公司科技重大專項(2014E-050203)世界地質(zhì)第33卷組儲,大磨拐河組蓋,為下生上