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1、第36卷第1期石油寥豁似屆Vol_36.No.12014年1月PETRoLEUMGEOL0GY&EXPERIMENTJan.,2014文章編號(hào):1001-6112(2014)O1—0083—06doi:10.11781/sysydz201401083塔河油田奧陶系油藏成藏期次研究饒丹,秦建中,許錦,施偉軍,張志‘榮,席斌斌,陶國亮,蔣宏(1.中國石油化212股份有限公司石油勘探開發(fā)研究院無錫石油地質(zhì)研究所,江蘇無錫214126;2.中國石油化工集團(tuán)公司油氣成藏重點(diǎn)實(shí)驗(yàn)室,江蘇無錫214151)摘要:
2、塔河油田奧陶系油藏的成藏期次長(zhǎng)期以來爭(zhēng)議較大,有兩期、三期、多期之爭(zhēng),對(duì)成藏期次認(rèn)識(shí)上的差異必然導(dǎo)致對(duì)其烴源巖層位認(rèn)識(shí)上的不同,從而給油氣勘探帶來一定程度的不確定性。經(jīng)過多年的多學(xué)科聯(lián)合攻關(guān),采用國際上最先進(jìn)的單體包裹體成分分析技術(shù),從不同期次單個(gè)油包裹體中提取出其地球化學(xué)特征信息,直接獲得了塔河油田東南部?jī)善诔渥⒃偷挠袡C(jī)成分信息,研究表明塔河油田東南部奧陶系油藏主要為兩期成藏。第一期油包裹體以發(fā)黃色一褐色熒光、芳烴組分相對(duì)飽和烴含量高、正構(gòu)烷烴分布完整(nc一nC)、輕烴缺失等為特點(diǎn),成熟度較低
3、,為早期運(yùn)移產(chǎn)物;第二期油包裹體以發(fā)藍(lán)色一藍(lán)白色熒光、飽和烴組分相對(duì)芳烴含量高、正構(gòu)烷烴分布較窄(nc一nC)、輕烴完整等為特點(diǎn),成熟度較高,為晚期輕質(zhì)原油充注的特征。結(jié)合古溫度、古壓力模擬,混源油比例判識(shí)研究.對(duì)不同期次原油充注的時(shí)間以及貢獻(xiàn)作了初步探討,這對(duì)塔河油田主力烴源巖的再認(rèn)識(shí)以及進(jìn)一步的勘探具有重要指導(dǎo)意義。關(guān)鍵詞:?jiǎn)误w包裹體;混源比例:成藏期次;奧陶系油藏;塔河油田中圖分類號(hào):TE122.3文獻(xiàn)標(biāo)識(shí)碼:AAccumulationperiodsofOrdovicianreservoirs
4、inTaheOilFieldRaoDan一,QinJianzhong,XuJin一,ShiWeijun,ZhangZhirong一,XiBinbin,TaoGuoliang一,JiangHong'(1.WuxiResearchInstituteofPetroleumGeology,SINOPEC,Wuxi,Jiangsu214126,China;2.SINOPECKeyLaboratoryofPetroleumAccumulationMechanisms,Wuxi,Jiangsu214151,Chi
5、na)Abstract:HowmanystagesofaccumulationhavetheOrdovicianreservoirsexperiencedintheTaheOilField,2,3orevenmore?Thedebatecausesdifferentunderstandingsofsourcerocklocation,henceleadstouncertaintyinoilandgasexploration.Afteryearsofmuhidisciplinaryjointresea
6、rch,usingthemostadvancedtechniqueofmono—metinclusioncomponentanalysis,thegeochemicalfeaturesofsingleoilinclusionduringdifferentstageshavebeenidentified.Thegeochemicalcomponentsofcrudeoilschargedduring2stagesinthesoutheastoftheTaheOilFieldhavebeenmadecl
7、ear.IthasbeenconcludedthattheOrdovicianreservoirsinthesoutheastoftheTaheOilFieldhaveexperienced2stagesofaccumulation.Theoilinclusionsofthe1ststagearefeaturedbyyellow—brownfluores—cence,higheraromaticcomponentcontentthansaturatedhydrocarboncontent,compl
8、etedistributionofn—alkanes(nC11一nC3o),andlighthydrocarbonmissing.Theyhavelowermaturityandmainlygeneratefromearlymigration.Theoi1inclusionsofthe2ndstagearefeaturedbyblue—lightbluefluorescence.highersaturatedhydrocarboncon—tentthanaromati