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1、中图分类号:TE122单位代码:11414学号:2014210604题目鄂尔多斯盆地延长油田致密油储层精细评价学科专业地质工程研究方向油气勘探地质工程硕士生朱蓄指导教师罗群副教授现场导师杨昌俊高级工程师二○一七年五月1摘要摘要鄂尔多斯盆地区油气储量十分丰富,现有的勘探数据表明,该地区具有特殊的地质条件,对致密油成藏以及富集形成具有十分有利的条件。延长油田致密油勘探开发尚处于初期阶段并且日益受到重视,但是在致密油储层特征方面的研究还相对薄弱。致密油储层研究的目的层主要是长6、长7、长8段储层,具有低孔隙度低渗透率的特征。综合岩性、
2、岩性组合、测井曲线特征等因素对延长西部探区目的层段进行沉积微相划分。沉积相研究表明:主要发育三角洲前缘亚相、滨浅湖亚相、半深湖亚相和深湖亚相的沉积相类型。该地区具有有效厚度的储集砂体,包括水下分流河道砂体、前缘席状砂、滩坝、浊积砂体等储集体。采用包括岩心分析、铸体薄片、扫描电镜、压汞实验等实验分析手段研究储层宏观岩石学特征及微观物性特征。结合现代计算机定量计算和数值模拟,包括Surfer、Grapher、双狐等专业技术软件勾绘等值线图、数字模拟平面展布图等,建立岩性、物性(孔、渗)、孔隙类型和孔隙结构等参数对目的层段进行分级并且
3、评价,得到认识:长6段储层总体最好,长8段储层次之,长7储层最差。关键词:延长油田;致密储层;精细评价;物性特征2ABSTRACTFineEvaluationofDenseOilReservoirinYanchangOrdosBasinABSTRACTTheOrdosBasinhasabundantoilandgasreserve,andtheexistingexplorationdatashowsthatthisareahasspecialgeologicalcondition,whichhasveryfavorablecon
4、ditionfortheformationofdenseoilandenrichment.Thoughthedevelopmentofdenseoilreservoirsisstillintheearlystagenowadays,itisveryimportanttostudythedevelopment,andmoreandmoreattentionbepaid.ThetargetlayersofthestudyofdenseoilreservoirsaremainlyChang6,Chang7,Chang8,whichha
5、velowporosityandlowpermeability.Comprehensivelithology,lithologyassemblage,loggingcurveandotherfactorstoextendthesedimentarymicrofaciesinthewesternexplorationarea.Sedimentaryfaciesstudieshaveshownthatthemaindevelopmentalsedimentaryfaciesaredeltafrontsubfacies,shoresh
6、allowlakesubfacies,semi-deeplakesubfaciesanddeeplakesubfacies.Thesandbodyintheareahasaneffectivethickness,includingunderwaterdistributarychannelsandbody,frontedgesand,beachdam,turbiditesandbodyandotherreservoirs.Studyingbymanymeans,concludingcoreanalysis,castsheet,sc
7、anningelectronmicroscopyandmercuryintrusionexperiments,macroscopicpetrologicalcharacteristicsandmicro-physicalpropertiesofthereservoircanbeknowned.Combinedwithmoderncomputerquantitativecalculationandnumericalsimulation,includingSurfer,Grapher,DoubleFoxandotherprofess
8、ionalandtechnicalsoftwares,wecandrawcontourmapsanddigitalsimulationplanemaps,andtheestablishmentoflithology,physicalproperties(poro