鄂尔多斯盆地上三叠统延长组长6油层组沉积构型分析

发布时间：2018-03-03 08:49

本文选题：长6油层组　切入点：沉积相　出处：《长江大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以沉积学理论为指导,基于野外露头资料、古生物资料和地球化学资料等,识别长6油层组沉积相类型,并刻画其剖面和平面展布特征。在沉积相研究的基础上,对不同成因单元的构型界面、组合样式及构型参数进行了精细刻画,建立了研究区三角洲构型模式。最终以沉积相和构型分析为指导,分析了研究区东缘储层宏观非均质性特征。综合分析各类资料后,认为研究区长6油层组主要发育曲流河相、曲流河三角洲相、辫状河三角洲相及湖泊相。此次野外露头剖面分布区沉积相以曲流河三角洲及辫状河三角洲为主,是储集砂体主要的分布相带,故三角洲是本次研究的重点。通过对研究区长6油层组构型界面的识别及构型实体的刻画,本文共识别出六种成因单元,即三角洲平原亚相分流河道、天然堤、废弃河道,三角洲前缘亚相水下分流河道、河口坝、支流间湾。本文以分流河道、水下分流河道及河口坝为重点进行构型分析,提出四种构型垂向组合模式:分流河道与分流河道叠置、水下分流河道与水下分流河道叠置、河口坝与河口坝叠置、水下分流河道与河口坝叠置。前三种组合均可分为离散式、侧向叠置、垂向叠置、复合叠置;最后一种组合可分为上叠型、下叠型和并列型。进而总结出两种构型模式:“缓坡型模式”和“陡坡型模式”。在沉积相和构型研究基础上,进而对研究区东缘长6油层组三角洲平原储层宏观非均质性特征进行了初步分析,认为层内非均质性较强,层间非均质性中等。
[Abstract]:Under the guidance of sedimentology theory, based on outcrop data, paleontological data and geochemical data, the sedimentary facies types of Chang 6 oil formation are identified, and their profile and plane distribution characteristics are described. The configuration interface, combination style and configuration parameters of different genetic units are described in detail, and the deltaic configuration model of the study area is established. Finally, the sedimentary facies and configuration analysis are used as the guidance. The macroscopic heterogeneity characteristics of reservoirs in the eastern margin of the study area are analyzed. After comprehensive analysis of various kinds of data, it is considered that meandering river facies and meandering river delta facies are mainly developed in Chang 6 reservoir formation in the study area. Braided river delta facies and lacustrine facies. The sedimentary facies in the outcrop profile of this field are mainly meandering river delta and braided river delta, which is the main distributive facies zone of reservoir sand body. Therefore, delta is the focal point of this study. Through the identification of the tectonic interface and the description of the configuration entities of Chang 6 oil formation in the study area, six genetic units are identified in this paper, that is, delta plain subfacies distributary channel, natural embankment, abandoned channel, etc. Deltaic front subfacies subfacies underwater distributary channel, estuarine dam, intertributary bay. This paper analyzes the configuration of distributary channel, underwater distributary channel and estuarine dam, and puts forward four types of vertical combination models: distributary channel and distributary channel superposition. The first three combinations can be divided into discrete type, lateral superposition, vertical overlay and composite overlay. The last combination can be divided into upper type, lower type and juxtaposition type. Then, two types of configuration models are summarized: "gentle slope model" and "steep slope model". Based on the study of sedimentary facies and configuration, Furthermore, the macroscopic heterogeneity characteristics of delta plain reservoirs of Chang 6 reservoir formation in the eastern margin of the study area are preliminarily analyzed. It is concluded that the heterogeneity is stronger in the inner layer and middle in the interlayer heterogeneity.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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