CAJ | 학술논문

根据大量的钻井、测井及分析化验资料,运用沉积学方法综合研究该区的沉积相及其演化特征,并认为:长2油层组早、中期(长2_3、长2_2)主要发育曲流河沉积,表现为垂向上河道砂体相互叠加,砂地比值高,平面上河道沉积广泛分布,泛滥平原沉积保存较少;晚期(长2_1)过渡为网状河沉积,河道砂体厚度变薄,地层砂地比变小.平面上河道呈网状分布,广泛发育河漫沼泽沉积.在沉积单元划分、对比的基础上,分析了4个单元沉积微相的平面展布规律.
근거대량적찬정、측정급분석화험자료,운용침적학방법종합연구해구적침적상급기연화특정,병인위:장2유층조조、중기(장2_3、장2_2)주요발육곡류하침적,표현위수향상하도사체상호첩가,사지비치고,평면상하도침적엄범분포,범람평원침적보존교소;만기(장2_1)과도위망상하침적,하도사체후도변박,지층사지비변소.평면상하도정망상분포,엄범발육하만소택침적.재침적단원화분、대비적기출상,분석료4개단원침적미상적평면전포규률.
Based on drilling cores and logging data,the sedimentary facies and its evolution characteristics of Chang 2 oil-bearing member in Yanchi-Dingbian area,Ordos Basin are studied.The result shows that fluvial system developed in Chang 2 depositional stage in this region.During the depositional period,there is a systematic change in channel types from meandering stream to anastomosing fiver.The meandering stream deposition developed at the bottom and middle sections (Chang 2_3,Chang 2_2) of Chang 2 member with thicker superposed channel sand body,higher sand-stone/ stratum ration,less floodplain and more channel deposits.While the anastomosing river deposition developed at the top section (Chang 2_1) of Chang 2 member with thinner channel sandstone-body,lower sandstone/stratum ration,less channel and more floodplain,swamp deposits.On the basis of sedimentary units division and correlation,the microfacies plane distributions of the 4 units are analyzed.