西非下刚果盆地基于三维地震和测井资料的相分析、TOC预测和烃源岩潜力表征

发布时间：2023-04-25 21:44

　　近年来,关于细粒沉积岩的勘探日益受到重视。本论文基于对西非下刚果盆地A块和S3块200平方公里地区的三维地震资料解释,对该地区烃源岩潜力进行评价与表征研究。其中该地区地层层位自下往上依次为:盐层、Sendji组、Likouala组、Madingo组和Paloukou组。与粗碎屑沉积物相比,烃源岩等细粒沉积物的勘探与研究较为薄弱,优质烃源岩发育的层段较难确定,因此本文拟通过地震相法、沉积相法及速度法等多种技术方法来预测烃源岩的分布。根据三维地震资料,生成各层位的平面厚度图,并对重点层位进行详细研究。Madingo组主要分为上、下两部分,通过古地貌图及海相烃源岩分布特征的研究,可以有效预测优质烃源岩的分布。通过对有机质富集的沉积发育模式、河道走向、沉积样式等的研究,综合认为该区适合有机质的富集和保存。综合利用地质-地球物理等相分析方法对烃源岩的分布规律、发育模式进行研究。有机质具有独特的物理化学性质,使得烃源岩与非烃源岩的测井响应差别明显。已有研究成果表明,对有机质敏感的测井曲线主要由自然伽马、电阻率、声波、密度中子等曲线,这是利用测井资料识别和评价烃源岩的基础。一般情况下,有机碳含量越高...

【文章页数】：195 页

【学位级别】：博士

【文章目录】：
Cover letter (resume)
PUBLUCATIONS
摘要
ABSTRACT
DEDICATION
ACRONYMS AND ABBREVATIONS
Chapter 1 Introduction
    1.1 Introduction
    1.2 Location of the area
    1.3 Exploration and research background of the study area
    1.4 objectives of the Research
    1.5 Generalized workflow
    1.6 STRUCTURE OF THE THESIS
Chapter 2 Regional Geology and Tectonic Evolution
    2.1 Introduction
    2.2 Regional geology of the area
    2.3 Geological and tectonic evolution history of the Basin
        2.3.1 Pre-rift stage (Late Jurassic to Berriasian Epoch of Early cretaceous)
        2.3.2 Syn-rift stage (upto Barremian Epoch Early Cretaceous)
        2.3.3 Post-rift stage and transitional stage (Aptian to Recent)
    2.4 Sequence Stratigraphic frame work
    2.5 Petroleum systems and hydrocarbon occurrences
        2.5.1 Source rock
        2.5.2 Reservoir rocks
        2.5.3 Seal rocks
Chapter 3 Data sets and Methodology
    3.1 Introduction to Source of data
        3.1.1 Seismic Data
        3.1.2 Well Data
        3.1.3 Base Map
        3.1.4 Thin sections
        3.1.5 Geochemical data
    3.2 Significance of the research
    3.3 Research Methodology
Chapter 4 Integrated seismic and well data interpretation
    4.1 Introduction
    4.2 Methodology
    4.3 Seismic interpretation analysis
    4.4 Source Rock development pattern analysis
        4.4.1 Structural maps (Time-depth map)
        4.4.2 Source channel analysis of Madingo group in Congo Basin
    4.5 Isochron maps
    4.6 Conclusions
Chapter 5 Analysis of the facies
    5.1 Introduction
    5.2 Methodology
    5.3 Well logs
        5.3.1 Interpretation of Facies analysis base on GR curve
        5.3.2 Analysis based on the GRP (Gamma Ray Pattern) curve
    5.4 Concept of Seismic facies analysis
        5.4.1 Sendji Formation seismic facies analysis
        5.4.2 Integrated facies analysis in Likouala Formation
        5.4.3 Integrated facies analysis in Madingo Formation
        5.4.4 Integrated facies analysis in Paloukou Formation
    5.5 Sedimentary facies
    5.6 Attributes Analysis
    5.7 Conclusion
Chapter 6 Total Organic Carbon Evaluation by well Logs
    6.1 Introduction
    6.2 Methodology
    6.3 Basic theory and background
    6.4 The Rock-Eval Data of the Mohm-1 well
    6.5 TOC Evaluation Methodologies
        6.5.1 Selection of appropriate inputs/Linear regression analysis
        6.5.2 Multiple variate method
        6.5.3 Schmocker and Hester model
        6.5.4 Passey et al. model ΔlogR Method
    6.6 Comparsion models for different data sets
    6.7 A data base approach (ANN)
        6.7.1 Back propagation network design(ANN) Theory
        6.7.2 Comparison of BP predicted TOC vs Measured TOC
    6.8 Conclusions and discussion
CHAPTER 7 SOURCE ROCK MATURTY ASSESSMENT
    7.1 Introduction
    7.2 Oil and Gas Formation
    7.3 Petroleum System
    7.4 Fundamentals of Source Rock
        7.4.1 Factor controlling source rock formation
    7.5 Thermal Transformation of Kerogene
    7.6 Kerogen Classification
    7.7 Rock Eval-Pyrolysis
    7.8 References for the Result Evaluation
    7.9 Maturity Indicators
    7.10 Source Rock Maturity Evaluation of Lower Congo Basin
        7.10.1 Rock-Eval Pyrolysis at Ma-1 well
        7.10.2 Biomarkers analysis at the Wells
    7.11 Conclusion
Chapter 8 Conclusions and Recommendations
    8.1 Main Results
    8.2 Implication for Future research directions
References



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