饶阳凹陷留西油田北部馆陶组沉积微相研究

发布时间：2018-01-13 19:07

本文关键词：饶阳凹陷留西油田北部馆陶组沉积微相研究　出处：《中国石油大学(华东)》2015年硕士论文　论文类型：学位论文

【摘要】：以高分辨率层序地层学、沉积学、油气田地下地质学理论为指导,根据钻录井、测井、地震、室内测试分析等资料,对研究区馆陶组进行地层划分与对比,识别出3个油层组、7个砂层组,其中Ng_2油层组和Ng_3油层组中分别划分出7和13个小层;在精细地层格架内,以重点取心井岩心观察与描述为基础,结合室内分析化验资料、测井曲线特征分析,共识别出了曲流河、辫状河两种沉积相类型,其中辫状河可进一步划分出4种微相:心滩、河道充填、道间滩地、道间洼地;曲流河可进一步划分出6种微相:边滩、河道充填、天然堤、决口扇、废弃河道、河漫滩,并系统总结了研究区各亚相、微相识别标志。在沉积微相类型识别基础上,对馆陶组沉积微相平面分布特征进行了系统分析。研究结果认为Ng_33沉积时期发育典型的辫状河沉积,河道全区广泛发育,砂体厚度大且叠置成片;向上演化为辫状河-低弯度曲流河沉积(Ng_32、Ng_31沉积时期),河道规模相对减小;Ng_2沉积时期以曲流河沉积为主,泥质沉积分布广泛,砂体厚度小且多呈孤立状分布;进入Ng1沉积时期,又以辫状河-低弯度曲流河沉积为主,砂体及河道规模有所增大。受构造背景控制,馆陶组各沉积时期西部砂体及河道大多呈北东向展布,东部则多呈北西向或近东西向延伸。最后以砂体及沉积微展布特征为基础,结合研究区成藏条件的分析以及目前试油试采结果,开展有利目标预测,共预测出Ng_32和Ng_31两个重点层位中6个有利目标。
[Abstract]:Guided by the theory of high-resolution sequence stratigraphy, sedimentology and underground geology of oil and gas fields, the formation of Guantao formation in the study area is divided and contrasted according to the data of drilling logging, logging, earthquake and laboratory test and analysis. Three reservoirs and seven sand formations were identified, among which 7 and 13 layers were divided into Ng_2 reservoir and Ng_3 reservoir, respectively. On the basis of core observation and description in fine stratigraphic framework, combined with laboratory analysis data and logging curve characteristic analysis, two sedimentary facies types, meandering river and braided river, were identified. The braided river can be further divided into four microfacies: Xintan, channel filling, inter-channel beach, inter-channel depression; The meandering river can be further divided into 6 kinds of microfacies: beach, river filling, natural embankment, crevasse fan, abandoned channel, flood beach, and the subfacies of the study area are summarized systematically. Based on the identification of sedimentary microfacies, the distribution characteristics of sedimentary microfacies in Guantao formation were systematically analyzed. The results showed that typical braided river deposits were developed in the Ng_33 sedimentary period. The channel area is widely developed, and the sand body is thick and overlaid. It evolved upward into braided river and low curvature meandering river deposition, and the river channel scale is relatively small. In the Ng_2 sedimentary period, meandering river was the main deposit, mud deposits were widely distributed, and the thickness of sand bodies was small and most of them were isolated. In the period of Ng1 deposition, braided river and low curvature meandering river are the main deposits, and the scale of sand body and channel is enlarged, which is controlled by tectonic background. Most of the sandbodies and rivers in the west of Guantao formation were distributed in the north to east direction, but in the eastern part they were mostly extended in the north to west direction or near east to west direction. Finally, the sand bodies and sedimentary microdistribution characteristics were taken as the foundation. Combined with the analysis of reservoir forming conditions and the results of oil test and production test in the study area, the favorable target prediction was carried out, and six favorable targets in the two key layers of Ng_32 and Ng_31 were predicted.
【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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