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1、2015年10月大慶石油地質(zhì)與開發(fā)0ct..2015第34卷第5期PetroleumGeologyandOilfieldDevelopmentinDaqingVo1.34No.5DoI:10.3969/J.ISSN.1000—3754.2015.05.005塔木察格盆地塔南凹陷下白堊統(tǒng)烴源巖評價王金奎嚴(yán)萌(1.大慶油田有限責(zé)任公司勘探開發(fā)研究院,黑龍江大慶163712;2.大慶油田有限責(zé)任公司鉆探工程公司,黑龍江大慶163412)摘要:塔南凹陷位于塔木察格盆地南部,是最富油的凹陷之一,發(fā)育下白堊統(tǒng)的銅缽廟組、南屯組、大磨
2、拐河組等3套烴源巖。運(yùn)用鉆井巖心的分析化驗(yàn)資料,對凹陷烴源巖的有機(jī)碳含量、氯仿瀝青“A”、生烴潛量、飽和烴色譜、有機(jī)質(zhì)成熟度等地球化學(xué)特征進(jìn)行研究。結(jié)果表明:南屯組烴源巖有機(jī)質(zhì)豐度高,達(dá)到優(yōu)質(zhì)烴源巖標(biāo)準(zhǔn),是塔南凹陷最好的烴源巖發(fā)育層段;南屯組有機(jī)質(zhì)類型以II型為主,含油部分為I型,反映了低等水生生物為基本生源構(gòu)成,主要分布在凹陷的中西部;烴源巖熱演化具明顯的分區(qū)性和階段性,不同的構(gòu)造單元具有不同的生油門限深度,南屯組和大磨拐河組下部烴源巖大多處于成熟階段;塔南凹陷中西部南屯組烴源巖有機(jī)質(zhì)類型好、厚度大、成熟度較高,具有大
3、量形成大規(guī)模油藏的物質(zhì)基礎(chǔ)。關(guān)鍵詞:塔木察格盆地;塔南凹陷;烴源巖;有機(jī)質(zhì)類型;成熟階段中圖分類號:TEl21.3文獻(xiàn)標(biāo)識碼:A文章編號:1000—3754(2015)05一o025—07APPRAISALoFLoWERCRETACEoUSSoURCERoCKINTANANSAGoFTAMUTSAGBASINWANGJinkui,YANMeng(1.ExplorationandDevelopmentResearchInstituteofDaqingOilfieldCo.Ltd.,163712,China;2.Drilli
4、ngandExplorationCo.ofDaqingOilfieldCo.Ltd.,163412,China)Abstract:TananSagislocatedinthesouthofTamutsagBasin.ItSoneoftheoil—richsagsinthebasin.Therearethreesetsofthewell—developedsourcerocks:TongbomiaoFormation,NantunFormationandDamoguaiheForma—tion.Withthehelpoft
5、heanalyzingdataofthedrillingandcoring,thegeochemicalcharacteristicsarestudiedforthesourcerockssuchasorganiccarboncontent,chloroformasphalt“A”,hydrocarbongeneratingpotential,satu—ratedhydrocarbonchromatograph,organicmattermaturityetc.Especiallytheorganicmatterabun
6、danceinNantunsourcerocksisconsideredtoreachahighlevelandmeetthestandardsofthehigh—qualityhydrocarbonsourcerockandcanberegardedasthebestwell-developedintervalsinthesag.TypeIIorganicmatteristhemainforminNan—tunFormation,theoil-bearingTypeIkerogenrespectsthebasiccom
7、positionsofthelow—levelaquaticlifeandisgenerallydistributedinthemiddleandwestofthesag.Thethermalevolutionofthesourcerocksintheregionhastheobviouscharacteristicsofdistrictandgradualness.Threearedifferenthydrocarbongeneratingthresholdsindif-ferenttectonicelementsof
8、thewholearea.MostofthesourcerocksinNantunFormationandLowerDamoguaihe收稿日期:2015。07.08改回日期:2015—07—23基金項(xiàng)目:中石油股份公司科技攻關(guān)項(xiàng)目“大慶探區(qū)第四次油氣資源評價”(2014E一050203)。作者簡介:王金奎,男,19