临南斜坡曲9-111断块沙四上亚段沉积微相研究

发布时间：2018-04-09 02:11

本文选题：曲9-111断块　切入点：沙四上亚段　出处：《中国石油大学(华东)》2015年硕士论文

【摘要】：本次研究主要以高分辨率层序地层学、沉积学及油气田地下地质学等基础理论为指导,参照研究区的沉积背景与地层发育特征,通过岩心、测井、地震等资料的综合分析认为:研究区沙四上亚段(准层序组)可以划分为4个短期旋回(准层序)、24个超短期旋回(小层);在岩心观察、室内分析化验资料及电性资料综合分析的基础上,依据岩石学、结构、沉积构造、测井曲线特征及韵律性等主要沉积相特征,识别出沙四上亚段主要发育滨浅湖背景下的扇三角洲前缘沉积亚相,并可进一步细分为水下分流河道、水下溢岸砂体、河口坝、前缘席状砂及分流间湾等5种主要微相类型,详细总结了各种沉积微相的主要特征;在此基础上,以砂岩厚度、砂岩百分含量、测井曲线特征等参数为基础,按照单因素作图法,分析各砂层组及重点小层的砂体与沉积相平面展布特征,在纵向演化过程中多次出现基准面的升降及分流河道的摆动,使得沉积相平面分布特征发生相应的变化,依据沉积微相展布特征及纵向演化规律,总结研究区的沉积相模式。在以上研究的基础上,结合不同沉积微相的物性特征,认为:水下分流河道及河口坝微相为优势储集相带;在沉积演化过程中,处于活动期的断层是重要的油气运移通道,并在封闭性断层及不整合面之下形成油气聚集;隔层厚度一般介于2.0~5.5m,具有良好的封闭性。综合以上各成藏要素并按照多因素叠加分析,对重点小层开展有利目标预测,认为:研究区主要形成与断层相关的断块圈闭,在各有利目标中,以三砂组2小层和二砂组6小层最为有利。
[Abstract]:Guided by the basic theories of high-resolution sequence stratigraphy, sedimentology and underground geology of oil and gas fields, and referring to the sedimentary background and stratigraphic development characteristics of the study area, this study is carried out through core, logging, and so on.The comprehensive analysis of seismic data shows that the upper submember of Sha 4 (quasi sequence formation) in the study area can be divided into 4 short term cycles (quasi sequence, 24 ultrashort cycles (small layer); observed in the core,On the basis of comprehensive analysis of laboratory data and electrical data, the main sedimentary facies characteristics, such as petrology, structure, sedimentary structure, logging curve characteristics and rhythm, etc.The main sedimentary subfacies of fan delta front in the background of shallow lake are identified, and can be further subdivided into five main microfacies types: underwater distributary channel, underwater overflow sand body, estuarine dam, front matting sand and interdistributary bay, etc.The main characteristics of various sedimentary microfacies are summarized in detail, and based on the parameters such as sandstone thickness, sandstone percentage content, logging curve characteristics and so on, the single factor mapping method is used.The distribution characteristics of sand bodies and sedimentary facies in various sand formations and key substrata are analyzed. During the longitudinal evolution process, the elevation of base level and the swinging of distributary channel occur many times, which make the distribution characteristics of sedimentary facies plane change correspondingly.According to the distribution characteristics of sedimentary microfacies and the law of longitudinal evolution, the sedimentary facies model in the study area is summarized.On the basis of the above research, combined with the physical characteristics of different sedimentary microfacies, it is considered that the underwater distributary channel and the estuarine dam microfacies are the dominant reservoir facies zones, and that the faults in active stage are important hydrocarbon migration channels during the sedimentary evolution.Oil and gas accumulation is formed under the sealing faults and unconformities, and the thickness of the interlayer is generally between 2.0 ~ 5.5 m, which has good sealing ability.According to the above factors of reservoir formation and multi-factor superposition analysis, the favorable target prediction is carried out for the key layers. It is considered that the main fault block traps related to faults are formed in the study area, and among the favorable targets,3 sand formation 2 and 2 sand 6 are the most favorable.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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