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塔中10井区上奥陶统良里塔格组开阔台地沉积特征摘要:本次论文的研究对象为塔中10井区上奥陶统良里塔格组的开阔台地。充分利用沉积学、地层学等方面的知识，并以国内外相关研究的新理论、新方法为指导，通过综合运用岩心、岩屑、薄片、测井等资料，分析地层特征。并在地层划分与对比的基础上，利用沉积相识别的古生物相标志、测井相标志及岩石学标志对研究区的沉积相类型进行精细识别和划分。然后结合地层的岩性、测井等资料，综合分析沉积相纵横向发育特征。最终建立研究区的沉积相模式，对不同层段的沉积相平面分布进行预测和分析，明确有利沉积相带分布区。按着自上而下的顺序，研究区良里塔格组地层分为5段，地层厚度特征为两边薄中间厚，局部厚度差异受沉积微地貌控制明显。塔中10井区良里塔格组开阔台地内的岩石种类比较多，岩石岩性主要是灰岩类，主要类型为颗粒灰岩类、泥晶灰岩类和生物灰岩类三大类研究区域内的沉积相为开阔台地相，该沉积相可划分为台内滩、滩间海等亚相及礁核、丘核等沉积微相。台内滩较为发育，连续性较好，呈带状展布；在台内滩上发育有台内点礁，呈点状分布；从沉积相模式图上可以看出，研究区良里塔格组总体表现为开阔台地-台地边缘-斜坡-盆地的沉积体系。关键词：碳酸盐台地；开阔台地；沉积特征；良里塔格组；上奥陶统；塔中10井区AbstractTheresearchobjectofthispaperistheopenplatformofUpperOrdovicianLiangligeaFormationinTazhong10wellarea.Makefulluseofsedimentology,stratigraphyandotheraspectsofknowledge,andrelatedresearchathomeandabroadtothenewtheoryandnewmethodsasaguide,throughthecomprehensiveuseofcore,cuttings,thinslices,loggingandotherinformationtoanalyzetheformationcharacteristics.Basedonthestratigraphicdivisionandcontrast,thesedimentaryfaciestypesofthestudyareaarefinelyidentifiedanddividedbythepaleontologicalmarkers,loggingsignsandpetrologicalsignsidentifiedbythesedimentaryfacies.Then,combinedwiththelithologyandloggingofthestrata,theverticalandhorizontaldevelopmentalcharacteristicsofsedimentaryfaciesareanalyzedsynthetically.Finally,thesedimentaryfaciesmodelofthestudyareaisestablished,andthedistributionofthesedimentaryfaciesdistributionsindifferentintervalsispredictedandanalyzed,andthefavorabledistributionzoneisclearlyfavorable.Accordingtotheorderoftop-down,thestudyareaisdividedintofivesections,thethicknessoftheformationisthinonbothsidesofthethicknessofthin,localthicknessdifferencebythedepositionofmicro-topographycontrolsignificantly.TherearemanytypesofrocksintheopenplatformoftheLianglitaiFormationintheTazhong10wellarea.Themainlithologyislimestone,suchasbio-limestone.TheopenfaciesintheLianglitaiFormationofthestudyareaaredividedintosub-phaseandsandybeach,plummudandothersedimentarymicrofacies.TaiwanandInnerMongoliaaremoredeveloped,withgoodcontinuity,showingastripofcloth;intheTaiwanRiveronthedevelopmentoftheTaiwanReef,wasdotteddistribution;Taiwanbetweenthebeachismainlywithinthegentleslopesub-phaseandTaiwanDepressionsubfamilydevelopment.ItcanbeseenfromthesedimentaryfaciesmodelthattheLianglitaiFormationinthestudyareaisthesedimentarysystemoftheopenplatform-platformmargin-slope-basin.Keywords:Carbonateplatform;Openplatform;sedimentaryfacies;Lianglitagegroup;UpperOrdovician;TheTazhong10thwellarea.目录1绪论............................................................................................................................41.1研究的目的及意义........................................................................................41.2国内外研究现状............................................................................................41.2.1开阔台地的定义................................................................................51.2.2开阔台地的沉积特征........................................................................51.2.3开阔台地的勘探进展........................................................................51.3研究思路及技术路线....................................................................................61.4研究内容及工作量........................................................................................61.4.1研究内容............................................................................................61.4.2论文工作量........................................................................................82区域地质背景............................................................................................................93地层划分及对比......................................................................................................113.1地层划分......................................................................................................113.2地层对比......................................................................................................133.3地层平面分布..............................................................................................134沉积相特征..............................................................................................................164.1沉积相标志..................................................................................................164.1.1岩石学标志......................................................................................164.1.2测井相标志.....................................................................................204.1.3古生物相标志..................................................................................224.2沉积亚相划分及特征分析..........................................................................224.2.1台内滩亚相......................................................................................234.2.2台内洼地亚相..................................................................................234.2.3台内点礁..........................................................................................254.2.4台坪亚相..........................................................................................26