襄城凹陷未熟—低熟油的形成条件

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1、第30卷第3期石油学报Vo1．3ONo．32009年5月ACTAPETROLEISINICAMav2009文章编号：0253—2697(2009)03～0354—07襄城凹陷未熟一低熟油的形成条件姚亚明陈建军。乔桂林严永新。何明喜。马万怡(1．河南工程学院环境工程系河南郑州45l191；2．西安石油大学油气资源学院陕西西安710065；3河南石油勘探局地质研究院河南南阳473132)摘要：襄城凹陷下第三系油气显示较为广泛，原油性质呈高密度、高黏度、高含硫、高含蜡的特点，为典型的未熟一低熟油。根据襄城凹陷所处的区域构造背景及烃源岩和原油的有机地球化学特征，采用有机显微纽分分析、生

2、物标志物检测、有机岩石学研究等方法，对源岩的沉积环境、烃源岩特征以及生烃母质来源进行了深入分析，探讨了未熟一低熟油油藏形成的主要地质条件。研究结果表明，核桃园组多为半成水一成水湖相和盐湖相沉积，属于还原一强还原环境；形成未熟一低熟油的主要成烃母质是藻类，陆源有机质中的木栓质体、角质体和各种细菌；应以核二段为主要目的层，以寻找短距离运移、聚集及自生自储油气藏为主。关键词：襄城凹陷；烃源岩地质条件；显微组分；未熟一低熟油；有机地球化学特征中图分类号：TE112．1文献标识码：AFormationconditionforimmaturetolow-matureoilinXiangch

3、engDepressionYAOYarning’CHENJianjunQIAOGuilinYANYongxinHEMingxiMAWanyi(1．DepartmentofEnvironmentandTechnology，HenanTechnologyInstitute，Zhengzhou451191，China；2．SchoolofPetroleumResources，Xi’anShiyouUniversity，Xi’an710065，China；3．ResearchInstituteofGeology，HenanPetroleumExplorationBureau，Nanya

4、ng473132，China)Abstract：ThereexistextensivelyoilandgasdispalyinEogeneofXiangchengDepression．Thecrudeoilischaracterizedbyhighden—sity，highviscosity，highbearing—sulphurandhighbearingwax，whichindicatesthatitisimmaturetolow—mature．Basedonthemaingeologicconditionsofregionaltectonicsetting，organic

5、geochemistrycharacteristicsofsourcerocksandcrudeoil，sedimentenviron—mentandtheabundanceandtypeoforganicmattersinsourcerockswereanalyzedusingtheorganicmaceralanalysis，biomarkersandorganicpetrographyinXiangchengDepression．Themaingeologicalconditionsforformingimmaturetolow-matureoilinHetaoyuanG

6、roupofXiangchengDepressionwerediscussed．TheresultshowedthatsedimentaryenvironmentofHetaoyuanGroupwerebrack—ishtosalinewaterlakefaciesbelongingtodeoxidizetostrongdeoxidize，andthemainhydrocarbon—generatingmaterialwasalga，cot—ticaltissueandcutiniteoforganicmatterfromcontinentandsomekindsofbacte

7、rium．TheresultalsoshowedthatEh2wasthemaintargetsequences，andoilandgasreservoirswiththefeaturesofshortoil—migrationandhandyaccumulation，self-generatingandself-preservingwerethemainexploredtarget．Keywords：XiangchengDepression；geologicalconditionofsou