赞比亚南部Maamba盆地上石炭统—二叠系下Karoo群地质特征与含油气系统

发布时间：2021-07-24 15:29

　　Maamba盆地位于赞比亚南部，临近与津巴布韦的边界。此盆地与NNE-SSW向Karoo断裂带缝合线走向一致，形成受中生代冈瓦纳造山带分解形成的泛非洲移动带（Pan African mobile belts）控制。盆地的形成与沿MSZ左旋运动引起的WNW-ESE向张应力的活化相关，后期被晚石炭世-二叠纪陆相沉积地层充填。这项研究计划旨在丰富Maamba盆地以及其它类似的陆相Karoo裂谷盆地的地质和油气系统下Karoo群数据库。6个主要的岩相（混杂岩，砾岩，砂岩/粉砂岩，煤和泥岩）代表了下Karoo群向上变细的沉积序列。4个泥岩岩芯样品被制作成薄片用于岩相分析。6个砂岩样品被制作成铸体薄片以识别孔隙。另外利用扫描电子显微镜（SEM）进行了岩石成分和孔隙类型的识别。此外共有35个泥岩和煤的岩心样品用于岩石热解/总有机碳（TOC）分析。根据分析结果，共发现3个沉积环境，其中包括冲积平原相，河漫滩/河湖相以及湖泊相。漫滩/河湖沉积以泥岩、煤源岩和河道砂岩储层为主。泥岩和煤源岩的总有机碳（TOC）含量普遍高于0.5%的下限值。然而，氢指数（HI）却低于200mgCH/g，表明均为III型有机质... 

【文章来源】：吉林大学吉林省 211工程院校 985工程院校 教育部直属院校

【文章页数】：83 页

【学位级别】：硕士

【文章目录】：
摘要
Abstract
CHAPTER 1 Introduction
    1.1 Location of the study area
    1.2 Geology and petroleum systems background
    1.3 Purpose and significance of the study
CHAPTER 2 Tectonic, structural and stratigraphic framework
    2.1 Tectonic framework
    2.2 Structural framework
    2.3 Stratigraphic framework
CHAPTER 3 Material and methods
    3.1 Geological reconnaisance
    3.2 Petrography of mudstones and sandstone
    3.3 Scan Electron microscopy (SEM)
    3.4 Total Organic Carbon (TOC wt %)
    3.5 Rock-Eval pyrolysis
CHAPTER 4 Results
    4.1 Lithofacies
    4.2 Alluvial floodplain deposits
    4.3 Floodplain/fluvial-lacustrine deposits
        4.3.1 Lower Gwembe
        4.3.2 UpperGwembe
    4.4 Lacustrine deposits
    4.5 Basin structure and geometry
CHAPTER 5 Laboratory analyses of lithofacies
    5.1 Conglomerate petrography
    5.2 Sandstone petrography
        5.2.1 Quartz
        5.2.2 Feldspar
        5.2.3 Lithic fragments
        5.2.4 Micas
        5.2.5 Matrix
    5.3 Sandstone classification
    5.4 Sandstone provenance
    5.5 Mudstone petrography
        5.5.1 Carbonaceous mudstones
        5.5.2 Silty mudstone
    5.6 Coal maceral analyses
        5.6.1 Liptinite Group
        5.6.2 Vitrinite Group
        5.6.3 Inertinite Group
    5.7 Diagenetic and reservoir characteristics
        5.7.1 Compaction
        5.7.2 Dissolution
        5.7.3 Kaolinite precipitation
        5.7.4 Cementation
        5.7.5 Fracturing
    5.8 Porosity characteristics
CHAPTER 6 Petroleum systems
    6.1 Source rock parameters
        6.1.1 Quantity
        6.1.2 Quality
        6.1.3 Maturity
    6.2 Reservoir Quality
    6.3 Seals
    6.4 Traps
CHAPTER 7 Discussion
    7.1 Deposition sediment source
    7.2 Basin evolution
    7.3 Diagenesis and paragenetic sequence in channel sandstone
    7.4 Effects of Rock-Eval pyrolysis
    7.5 Basin uplift and exhumations
    7.6 Effects of reservoir quality
    7.7 Petroleum potential
    7.8 Hydrocarbon play concept model
Conclusion
References
Papers published during the master’s degree
Acknowledgements



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