济阳坳陷上古生界煤成气储层沉积及储盖组合特征-矿产普查与勘探专业论文.docx

摘要在系统收集和整理研究区石炭—二叠系沉积特点、沉积序列资料的基础上，分析了 济阳坳陷石炭—二叠系沉积体系特征，识别出了四大沉积体系：潮坪沉积体系、障壁— 泻湖沉积体系、浅水三角洲沉积体系和河流—湖泊沉积体系，并研究了各沉积体系的构 成，即沉积相类型及其特征。充分利用测井、岩心、录井等资料，对研究区进行高分辨率层序地层划分，建立了 石炭—二叠系层序地层学格架。以4、5、6三个层序为核心，重建了沉积体系域，特别 是对各体系域的相构成、砂岩储层进行了详细地研究。研究了上石盒子组的奎山段、万山段砂岩储层的物性特征、成岩作用及成岩期次， 结果表明：奎山段、万山段砂岩的成岩阶段为晚成岩A期；二叠系砂岩属于特低孔低渗 储层；研究区内储层非均质性可分为三种类型：平面非均质性、层内非均质性和层间非 均质性。分析了济阳坳陷奎山段、万山段砂岩储层总体分布趋势，并以孤北区块为例分 析了重点层序6 的不同体系域砂体空间展布特征和规律。初步探讨了济阳坳陷区内的泥岩盖层特征和分布规律，对储盖组合进行分区评价， 认为研究区内有三类储盖组合：Ⅰ类、Ⅱ类和Ⅲ类。关键词：济阳坳陷；煤成气；层序地层学；成岩作用；储盖组合ABSTRACTBasingoncollectingmaterials,thesedimentaryevolutionandsedimenatrysystemof CarboniferousandPermianinJiyangDepressionareanalyzed.Inthispaper,foursedimentarysystemsaredescribed,includingthesedimentarysystemsoftidalflat,barrier-lagoon,shallowwaterdeltaandcompoundriver-lake.Thetypesoffaciesanddepositenvironmentsofeverysedimentarysystemareexplained.Basingonmaterialsofwell-logging,seismicexplorationanddrillcore,theresearchareaarestudiedbythehighresolutionsequencestratigraphy.Thesequenceframeworkof Carboniferous–Permianareconstructed.Thesystemtractofsequence4th,5thand6thareespeciallyanalyzed.Bythisway,thesandstonereservoircharacteristicsarestudied.ThematerialcharacteristicsanddiagensisofKuishanMemberandWanshanmemberarespeciallyanalyzed.Accordingtotheanalysis,thediagensisperiodisthoughttobeLateDiagensisA;thesandstonereservoirofPermianbelongstotheleastporeandthelowestpermeablematerial;TheheterogeneitiesofReservoirarestudied.Threekindsof heterogeneitiesareconcluded:intraformationalheterogeneity,interformationalHeterogeneityandflatHeterogeneity.ThesandstonereservoirdistributioninKuishanMemberandWanshan Memberarestudied.IntheexampleofGubeiarea,theregulationofsandstonedistributioncanbestudiedin6thsequence.Themudstonecharacteristicsandthedistributionregulationarepreliminarystudied.Bytheevaluationofassociationofreservoirrockandmudstonerock,threekinds associationsaredivided.KeyWords:JiyangDepression;coalgas;sequencestratastratigraphy;diagensis;associationofreservoirrockandraprock目录1