鄂尔多斯盆地陕北斜坡中6油组3砂组沉积体系及勘探前景

来源：五一七教育网

・208・

2010年2月　第32卷　第1期石油天然气学报(江汉石油学院学报)　

JournalofOilandGasTechnology(J1JPI)　Feb12010　Vol132　No11

鄂尔多斯盆地陕北斜坡中6油组3砂组

沉积体系及勘探前景

　　吴新伟,王勇刚　(长江大学地球化学系,

湖北荆州434023)

[摘要]通过对鄂尔多斯盆地陕北斜坡中63砂组沉积体系研究,在成岩作用和沉积作用研究的基础

上,对工区长63砂组的储层进行了评价。通过沉积体系研究、储层评价、构造分析及已发现油层平面展布图等4图叠加,结合工区的成藏条件和成藏因素分析,查明了研究区长63砂组的有利勘探区域,认为

621R岩性圈闭和622R岩性圈闭及623背斜构造和624鼻状构造是有利的勘探区。[关键词]沉积微相;勘探潜力;长63砂组;陕北斜坡[中图分类号]TE12113

[文献标识码]A　　[文章编号]100029752(2010)0120208203

长庆油田分公司采油三厂位于鄂尔多斯盆地陕北斜坡中部,是长庆油田分公司油气产量最高的采油厂。随前早期发现的长62砂组以上层位开发程度的加强,目前主要面临着寻找新的有利勘探区块和层位的任务。陕北斜坡采油三厂的勘探开发区长63砂组勘探程度较低,该层位于深湖、半深湖区边缘的三角洲前缘,邻近长7油组主力烃源岩发育层位;近3年来,在吴420区块长63砂组探明储量面积38175km2,探明储量4×104t;因此,陕北斜坡采油三厂范围长63砂组沉积体系描述及勘探前景研究,对挖掘新层位的勘探潜力,对增储上产,具有重要的现实意义。

1　地质概况

根据盆地现今构造形态、基底性质及构造特征,鄂尔多斯盆地可划分为伊盟隆起、渭北隆起、晋西挠褶带、陕北斜坡、天环坳陷及西缘冲断构造带6个一级构造单元[1]。研究区(采油三厂)位陕北斜坡带中部,处于安五油田和靖安油田之间,勘探面积2978km2。

鄂尔多斯盆地延长组沉积期处于内陆盆地阶段;湖盆经历了湖盆初始发育、湖盆扩张、湖盆持续发展、湖盆收缩、湖盆消亡5个主要阶段[2,3]。长7油组达到湖盆扩张的全盛时期,盆地广大范围被湖水淹没,形成大面积的半深水2深水湖泊,沉积厚度愈百米,发育富含有机质的黑色泥质岩及油页岩,生油条件好,为盆地提供了丰富的油源,是盆地最主要的油气来源[4,5];长6油组时期为湖盆持续稳定下沉阶段,此时沉积速率与盆地沉降速率基本持平或前者略大于后者,因此长6油组沉积时期在湖盆周缘形成一系列大型建设性河控湖泊三角洲沉积,三角洲前缘逐渐向湖盆进积[2,3],砂岩发育,范围广、厚度大,物性好,为油气成藏提供了良好的储集条件[6]。从区域背景分析,研究区长63砂组形成于湖盆持续发展期,是志靖2吴旗河三角洲体系物源为主,受安塞河流三角洲体系影响的三角洲前缘沉积[7]。

2　长63砂组沉积展布

通过单井相分析,剖面相分析,在砂岩厚度基础上,编制了研究区长63砂组沉积相平面图(图1)。从沉积相图分析表明,研究区长63砂组沉积期,两大物源体系明显。西部新63井2元35井2元1

　[收稿日期]2009211220

　[作者简介]吴新伟(19752),男,1999年大学毕业,工程师,硕士生,现主要从事油气田勘探与开发工作。

第32卷第1期吴新伟等:鄂尔多斯盆地陕北斜坡中6油组3砂组沉积体系及勘探前景　・209・

井三角洲前缘为吴旗2志靖河流三角洲体系,砂体向南东延伸。东部2个三角洲前缘朵状体:新56井2新29井2塞522井三角洲前缘朵状体和陕128井2高48井2高22井三角洲前缘朵状体为安塞河流三角洲体系,由北东向南西延伸。在两大物源体系之间,发育分流河道间沉积。

3　长63砂组构造特征

　　研究区长63砂组处于伊陕斜坡带上,断裂和褶皱不发育,主要发育的是鼻状构造和岩性圈闭。

研究区发育7个局部构造(图2)。1号构造发育于吴420断层上盘,为断背斜构造(图2中621);2号构造发育于吴420断层下盘,为断背斜构造(图2中622);3号构造发育于

　　图1　研究区长63砂组沉积相展布图虎狼峁区块,是一个继承性背

斜构造(图2中623);4号构造发育于虎狼峁塞234井2塞324井2塞235井区域,为鼻状构造(图2中624);5号构造发育于新92高222高48区域,为鼻状构造(图2中625);6号构造发育于新562陕92井区域,为鼻状构造(图2中626);7号构造发育于新582新272塞3332塞388井区域,为鼻状构造(图2中627)。

　　图2　研究区长63砂组构造图

4　长63砂组有利勘探区分析

通过构造图、沉积相图、储层评价平面图、已发现油层平面分布图等4图叠加,查明了研究区有利

区块的平面分布(图3)。

621R岩性圈闭包括1号构造,该区储层是水下分流河道或河道侧缘席状砂,为好至中等储层;紧临主力烃源岩,且有断层与烃源岩勾通;目前在构造高部位发现油层或差油层,但由于砂层叠置,储层非均质性强,导至油水关系复杂化,在构造低部位可展开勘探。

622R岩性圈闭储层是水下分流河道或河道侧缘席状砂,为好至中等储层;紧临主力烃源岩,且有

・210・　石油天然气学报(江汉石油学院学报)2010年2月

断层与烃源岩勾通;目前在构造高部位发现油层或差油层,在构造低部位可展开勘探。

长623背斜构造发育水下分流河道2前缘席状砂岩,是好到中等储层;紧临主力烃源岩,位于高44断层附近;目前在构造低部位发现油层或差油层;由于该区处于相变区,砂岩交互叠置和尖灭,导至油水关系复杂,在构造高部位可展开勘探。

长624鼻状构造发育水下分

流河道2前缘席状砂岩,是好到

　　图3　研究区长63砂组有利区块分布平面图中等储层;紧临主力烃源岩;

目前在鼻状构造高部位发现油

层或差油层,可向鼻状构造高部位展开勘探。

5　结　　论

1)分析表明研究区的物源主要来自吴旗2志靖河流三角洲体系和安塞河流三角洲体系。

2)研究区位于伊陕斜坡带上,断裂和褶皱不发育,发育7个小型局部构造,主要发育鼻状构造和

岩性圈闭。

3)通过对沉积展布研究,在成岩和沉积研究的基础上,对储层进行了评价,通过沉积、储层评价、构造图、已发现油层平面展布图的叠加,查明了研究区的有利勘探区域,综合表明621R岩性圈闭和622R岩性圈闭及623背斜构造和624鼻状构造为工区的有利的勘探区。

[参考文献]

[1]长庆油田石油地质志编写组1中国石油地质志(卷十二)・长庆油田[M]1北京:石油工业出版社,19921

[2]邓秀芹,蔺晓,刘显阳,等1鄂尔多斯盆地三叠系延长组沉积演化及其与早印支运动关系的探讨[J]1古地理学报,2008,10

(2):159～1661

[3]付金华,郭正权,邓秀芹1鄂尔多斯盆地西南地区上三叠统延长组沉积相及石油地质意义[J]1古地理学报,2005,7(1):34～

441

[4]杨华,张文正1论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用:地质地球化学特征[J]1地球化学,

2005,34(2):147～1541

[5]张文正,杨华,李剑锋,等1论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用———强生排烃特征[J]1石油

勘探与开发,2006,33(3):2～2931

[6]谢正温,谢渊,王剑,等1鄂尔多斯盆地富县地区延长组主要油层组储层特征[J]1石油实验地质,2005,27(6):575～5821[7]蔺宏斌,姚泾利1鄂尔多斯盆地南部延长组沉积特性与物源探讨[J]1西安石油学院学报(自然科学版),2000,15(5):7～91

[编辑]　宋换新

192GenesisofHighDensityandHighViscosityOilofBlockTianX90inWesternChajiang

SlopeofJinghuSag

FENGWu2jun　(GeologicalResearchInstitute,JiangsuOilfieldCompany,SINOPEC,Yangzhou

225012,Jiangsu,China)

Abstract:SaturatedhydrocarbonchromatographicalanalysisindicatedthattherewasnobiodegradationoroxidationattheearlystageofthehighdensityandviscosityoilinBlockTianX90inEf31Thehighdensityandviscosityweretheprimarycausesoflowmature2sourcerockforalongterm1Itwaspointedoutthattheoilandgasexplorationshouldbecarriedoutinthecenterofhydrocarbongenerationinthesubdepression1OilgenesisisspecialinWellTianX90ofEf3,lowmatureisnottheonlyreason,thereex2istsinfluenceofgaswashingandcarbondioxideelution,thusPalaeozoichydrocarbonreservoirandinorganiccarbondioxidegasreservoirformationshouldbeconcernedaswellasTertiaryoilreservoirs1

Keywords:JinghuSag;highviscosity;biodegradation;maturity;JiangsuOilfield197TheDiscontinuityofEasternQintongDepressionandOriginAnalysis

ChinaUniversityofGeosciences,Wuhan430074,Hubei,China)

XIAOWei2de,TANGXian2jun,YUWen2hui,SHANRui　(CollegeofEnergyResourcesandGeophysics,

Abstract:ThemajorboundaryfaultsalwaysexperiencedacomplicatedgrowthhistoryandcausedregionalsegmentationofextendedzoneintheCenozoicextensionalbasinofeasternChina1Basedontheanalysisandsummarizationoftheresultsof32DstructuralinterpretationineasternQintongDepression,thediscontinuitypropertyalongNEstrikewasdiscovered12structuralunitsI,IIaredividedfromNEtoSW,theunitIIcouldbesubdividedintoⅡ1andⅡ2,Theearlysubsectiongrowthandlaterlinkageofmajorboundaryfaultsresultinnon2equilibriumofstrainalongstrike1TheweakNWstrikeisoneoftheinfluentialfactors1Keywords:structuraldiscontinuityproperty;Transferzone;softlinkage;hard2link2age;QintongDepression1205Yan8210ReservoirFlowUnitsofYananFormationinJiyuanOilfield

na)

FANGGuo2qing,XUYa　(SchoolofGraduates,YangtzeUniversity,Jingzhou434023,Hubei,Chi2

Abstract:InconsiderationofpercolationcharacteristicsofreservoirsinJiyuanOilfield,thepercolationparameterssuitablefortheareawerechosen,amethodofclusteringwasusedforthecorrelationofpercolationparametersoftherepresentativewellstode2terminetypesofflowunits,theunknownsandbodiesinthewholeareawerepredictedbasedonjudgingandregressionanalysesandeventuallythespatialdistributionoftheflowunitsweredeterminedinthestudiedarea1Yan8210reservoirsinthestudiedareaofJiyuanOilfieldaredividedinto3typesofflowunits(typeA,B,C),ofwhichAandBaretheareasforfurthertappingthepotential,Cistheareaforstabilizingtheoilpro2duction1

Keywords:JiyuanOilfield;YananFormation;flowunit;flowindex;clusteringanaly2sis

208DepositionalSystemandExplorationProspectsofChang63SandGroupintheMiddleof

NorthShaanxiSlopeinOrdosBasin

WUXin2wei,WANGYong2gang　(Departmentof

Geochemistry,YangtzeUniversity,Jingzhou

434023,Hubei,China)

Abstract:BystudyingthedepositionalsysteminChang3SandGroup,thereservoirsinChang63SandGroupwereevaluatedonthebasisofdiagnosisanddepositionalstudy1ThroughthestudyofthedepositionalsystemevaluatingthereservoirqualityoftheChang63SandGroup,andcongruence,themapsofdepositionalsystemarediscovered,incombinationwiththeanalysesofreservoirformingconditionandthereservoirform2ingfactors,thefavorableoilexplorationareainsandgroupisclarified,itisconsideredthatthe621R,622Rlithologicaltraps,623anticlinestructureand624nosestructurearethefavorableexplorationplots1

Keywords:depositionalmicrofacies;explorationpotential;Chang63SandGroup;

Ⅺ

NorthShaanxiSlope;

223AnalysisandApplicationofDifferentStaticCorrectionMethodsinComplexSurfaceArea

GeophysicsandGeomatics,ChinaUniversityofGeosciences,Wuhan

430074,Hubei,China;GeophysicalResearchInstitute,ShengliOilfieldCompany,Dongying257022,Shandong,China)

LIJi2guang　(Collegeof

Abstract:Withthedevelopmentofoilandgasexploration,thetargetareaofexplora2tionwastransferredfromplaintotheareawithcomplexsurfacecondition1Inthoseare2asseverechangesofnearsurfacestructureinducedinhomogeneousdelay2timeofseismicwavetraveltimeandthedistortionofreflectionhorizononseismicprofile,whichaffect2edtheimagingqualityofseismicprofilegreatly1Onthebasisofanalyzingdifferenttypesofcomplexearthsurfacecharacters,thesummarized1Theprinciple,applicationrequirements,limitationandapplicationeffectofthosemethodswerealsointroduced1Two2dimensionalsurveylinesofmountainousandfoothillbeltareaweretakenforex2ample1Bycomparisonofrefractioncorrectionandtomographyinversion,theapprovedapplicationeffectoftomographyinversionmethodcanbefoundforsolvingthenearsur2facecorrectionproblemofmountainousandfoothillbeltarea1

Keywords:complexearthsurface;modelmethod;dunecurve;refraction,tomographyinversion

228ApplicationofSeismicAttributeAnalysisofReservoirPredictioninQianjiangDepression

na;ResearchInstituteofPetroleumExplorationandDevelopment,JianghanOilfieldCompany,SINOPEC,Qianjiang433124,Hubei,China)

LENGJun　(ResearchInstituteofPetroleumExplorationandDevelopment,JianghanOilfieldCompany,SINOPEC,Qianjiang433124,Hubei,China)

LUOZhong2hui　(CollegeofResources,ChinaUniversityofGeosciences,Wuhan430074,Hubei,Chi2

Abstract:Withthecontinuousdevelopmentofseismicattributemethod,theseismicat2tributeanalysistechniqueplayedamoreandmoreimportantroleinreservoirpredic2tion1Thetechniqueincludedseismicattributeextraction,seismicattributeoptimizationandanalysis,etc1ThepracticalgeologicalconditionsofBangdong2XinnongAreainQianjiangDepressionofJianghanBasinwerecombinedinthestudy,theseismicattrib2uteofEq341sandformationiscalculatedandoptimizedwiththetechniqueofseismicat2tribute,thedistributionregulationofEq341sandformationisstudiedbyusingthetech2niqueandgoodeffectisobtained1

Keywords:JianghanBasin;Bangdong2XinnongArea;seismicattribute;reservoirpredic2tion

232ANewMethodforDenoisingSeismicDataBasedonWaveletTransformandSingularVal2

ueDecomposition

WANGXiao2pin,HEZhen2hua　(StateKeyLaboratoryofOilandGasReservoirGeologyandExploi2

tation,ChengduUniversityofTechnology,Chengdu610059,Sichuan,China)

XIONGXiao2jun　(KeyLaboratoryofEarthExplorationandInformationTechnologyofMinistryofEducation,ChengduUniversityofTechnology,Chengdu610059,Sichuan,China)

Abstract:Inordertoeffectivelyremovetherandomnoiseinseismicdata,anewdenois2ingmethodwasproposedbyfullyusingwavelettransform(WT)andsingularvaluede2composition(SVD)1Inthismethod,first“waveletsoft2thresholddenoising”couldef2fectivelyreducethenoisevariance,second,SVDbasedondipscancouldidentifynoisepoints,trackeventautomatically,correctthedirectionofhorizontalevent,theadvan2tageofSVDeffectivenesswasfullyusedforremovingthenoiseofhorizontalevent1Theresultsoftheoreticalmodelandrealdatashowthattheproposeddenoisingmethodiseasyandfeasible,caneffectivelyeliminatetherandomnoiseandsignificantlyimprovethesignaltonoiseratioofseismicdata1

Keywords:wavelettransform;SVD;dipscan;seismicdatadenoising

253ResearchandApplicationoftheSecondLogInterpretationMethodforHubuzhaiGasField

tion,Puyang457061,Henan,China)

DUYuan2zong　(NaturalGasProductionandMarketingCompany,ZhongyuanOilfieldCorpora2

Ⅻ

因篇幅问题不能全部显示，请点此查看更多更全内容

查看全文

全部频道

鄂尔多斯盆地陕北斜坡中6油组3砂组沉积体系及勘探前景