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1、第37卷第1期石油農(nóng)劈弛屆VoJ_37.No.12015年1月PETRoLEUMGEoL0GY&EXPERIMENTJan.,2015文章編號:1001-6112(2015)叭一0064—07doi:10.11781/yydz2015O1064塔河油田奧陶系原油C26降膽甾烷分布特征及地質(zhì)意義李美俊,王鐵冠,張衛(wèi)彪(1.油氣資源與探測國家重點(diǎn)實(shí)驗(yàn)室中國石油大學(xué)(北京)地球科學(xué)學(xué)院北京102249;2.中國石化石油勘探開發(fā)研究院,北京100083)摘要:塔河油田奧陶系原油中都檢測出豐富的C,降膽甾烷系列。大多數(shù)原油24一降膽甾烷含量相對27一降膽甾烷
2、低,而九區(qū)T904和塔東地區(qū)TD2井原油24一降膽甾烷含量相對較高。以LN46、BD2等井為代表的上奧陶統(tǒng)灰?guī)r、泥灰?guī)r具有類似于塔河油田奧陶系原油的C26降膽甾烷分布特征,而以TD2井、和4井及柯坪露頭為代表的寒武系黑色泥巖和灰色灰?guī)r具有類似于T904和TD2井原油的C降膽甾烷分布特征。該文提出判識寒武系烴源層油氣來源的c。降膽甾烷地球化學(xué)判識標(biāo)準(zhǔn)為:NCR[24/(24+27)一降膽甾烷J>O.50,NDR[24/(24+27)一降重排膽甾烷]>0.35;上奧陶統(tǒng)烴源層油氣來源的C降膽甾烷判識標(biāo)準(zhǔn)為:NCR<0.40,NDR<0.35。結(jié)果表明C
3、降膽甾烷不僅是塔河油田奧陶系油藏進(jìn)行原油族群劃分的特征分子標(biāo)志物,也為研究硅藻、溝鞭藻等藻類的起源和演化以及塔里木盆地古板塊構(gòu)造運(yùn)動(dòng)提供了有力的分子地球化學(xué)證據(jù)。關(guān)鍵詞:降膽甾烷;硅藻;溝鞭藻;寒武系;塔里木盆地中圖分類號:TEl22.1文獻(xiàn)標(biāo)識碼:ADistributionofC26norcholestanesinOrdoviciancrudeoilsfromTaheOiifieldanditsgeologicalsignificanceLiMeijun,WangTieguan,ZhangWeibiao(1_StateKeyLaboratoryo
4、fPetroleumResourcesandProspecting,CollegeofGeosciences,ChinaUniversityofPetroleumBeijing102249,China;2.S1NOPECPetroleumExploration&ProductionResearchInstitute,Beijing100083,China)Abstract:AseriesofC,norcholestaneswasdetectedintheOrdoviciancrudeoilsfromtheTaheOilfield,theTarimB
5、asin.northwestChina.Theabundanceof24.norcholestanesinmostoftheOrdoviciancrudeoilswaslowerthanthat0f27一norcholestanes.TheoilsfromwellI)4intheeasternTahe0ilfieldandwellTD2intheeasternTmBasin.however,werecharacterizedbyrelativelyhigher24.norcholestaneabundance.ThedistributionofC,
6、norcholestaneoftheUpperOrdovieianmarlsfromthewellsU、446andBD2resembledthatofthemostOrdoviciancrudeoilsfromtheT£lheOilfield.ThedistributionofC,norcholestanesintypicalCambrianblackshalesandgravlimestonesfromthewellsTD2.He4andoutcropsfromKepingprofileresembledthatofthecrudeoilsfr
7、omthewellsr904andTD2.CriteriaareproposedrelativetoC,norcholestanesthatcouldbeusedtoclassifyoilfamilieswithintheOrdovicianreservoirs.0ilswithNCR(definedas24/(24+27)一norcholestanes)>0.50andNDR(definedas24/(24+27)一nordia—cholestanes)>0.35werethoughttobederivedfromtheCambriansourc
8、erocks.a(chǎn)ndoilswithNCR<0.40andNDR<0.35werethoughttobederivedfr