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1、學(xué)兔兔www.xuetutu.com-6天然氣地第33卷第6期OIL&GASGEOLOGY2012年l2月文章編號:0253—9985(2012)06—0828—08塔中I號坡折帶順西區(qū)塊順7井油氣地球化學(xué)特征及來源馬安來,金之鈞,李婧婧,朱秀香(1.中國石化石油勘探開發(fā)研究院,北京100083;2.中國石化西北油田分公司石油勘探開發(fā)研究院,新疆烏魯木齊830011)摘要:在塔中I號坡折帶順西區(qū)塊順7井的中、下奧陶統(tǒng)鷹山組獲得了凝析油與天然氣。凝析油具有飽和烴含量高、芳烴含量低、非烴瀝青質(zhì)含量低的特點(diǎn),飽芳比和非瀝比分別為13.5
2、1和18.50。凝析油Pr/Ph比為1.16,庚烷值和異庚烷值分別為33%和3.8,為高成熟凝析油。在生物標(biāo)志物組成上,由于成熟度較高,藿烷系列基本消失,三環(huán)萜烷以C。Z-環(huán)萜烷為主峰。凝析油具有較重的碳同位素,全油碳同位素值為一29.6%0,與公認(rèn)的寒武系生源的塔東2井原油具有相近的碳同位素值,因而凝析油可能來源于寒武系烴源巖。順7井天然氣為濕氣,天然氣甲烷碳同位素值僅為一51.7%0,與TZ45井奧陶系天然氣甲烷碳同位素值相近;天然氣組分同位素值分布呈現(xiàn)正碳同位素序列。該天然氣的來源可能為上奧陶統(tǒng)烴源巖。關(guān)鍵詞:成熟度;碳同位
3、素;生物標(biāo)志物;順7井;奧陶系;寒武系;塔里木盆地中圖分類號:TEl32.4文獻(xiàn)標(biāo)識碼:AGeochemicalcharacteristicsandoriginofhydrocarbonsintheWellShun-7ofwesternShuntuoguoleBlock,TarimBasinMaAnlai,JinZh~un,LiJingjingandZhuXiuxiang(1.Exploration&ProductionResearchInstitute,SINOPEC,Beijing100083,China;2.Petroleu
4、mExplorationandProductionResearchInstitute,NorthwestOilfieldBranchCorporation,SINOPEC,Urumqi,Xinjiang830011,China)Abstract:CondensateoilandnaturalgasweretestedintheYingshanFormationoftheLower.MidOrdovicianinwellShun-7ofwesternShuntuoguoleBlockinTazhong.Ifaulted.slope—
5、breakzone.TarimBasin.Theconden-sateoilfeaturesinhighcontentofsaturatehydrocarbonandlowcontentofaromatichydrocarbonandnon—hydro—carb0nasphahene.Theratioofsaturatehydrocarbontoaromatichydrocarbonandnon—hydrocarbontoasphaheneare13.51and18.50.respectively.ThePr/PhvalueiSa
6、bout1.16andtheheptaneandisoheptanevaluesare33%and3.8respectively。indicatinghighmaturityofthecondensateoil.Asthematurityishigh,hopanesseriesbasicallydisappearandtricyclicterpanesisdominatedbyC19"tricyclieterpanes.Thecarbonisotopeofthecon—densateoi1fromwellShun.7iS一29.6
7、%oandiSsimilartothatoftheCambrian—sourcedoilfromwellTD-2.indi—catingthecondensateoilofwellShun-7mightoriginatedfromtheCambriansourcerocks.ThewetgasofthewellShun-7hasamethanecarbonisotopevalueof一51.7%o.whichiSsimilartothatofthegasfromtheOrdovicianinwellTZ45.Thedistribu
8、tionofcarbonisotopesofthegascomponentsshowsanormalcarbonisotopesequence(ie,6”C1<813C2<813C3)indicatingthegasmaycomefromtheUp