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Table of contents
I. INTRODUCTION
I.1 Geopressure: Problematics and open questions
I.2 The Amazon Margin as a study area
I.3 Objectives of the thesis
II. OVERPRESSURE PROCESSES AND PRODUCTS
II.1 Overpressure mechanims
II.1.1 Desequilibrium compaction
II.1.2 Tectonic stress
II.1.3 Clay Diagenesis
II.1.4 Hydrocarbon generation
II.2 Gravity Tectonics
III. GEOLOGICAL SETTING
III.1 The Foz do Amazonas Basin
III.2 The Amazon Fan gravity tectonics
III.3 Thermal History and Hydrocarbon Potential
III.4 Summary
IV. DATA AND METHODS
IV.1 Dataset
IV.2 Methods
V. Controls on overpressure evolution during the gravitacional collapse of the Amazon deepsea fan
V.1 Introduction
V.2 Geological Setting
V.3 Data and Methods
V.3.1 Well data
V.3.2 Composite seismic reflection profile
V.3.3 Time-depth conversion of interpreted section
V.3.4 2D Structural Restoration
V.3.5 Pore pressure estimation from 1D geomechanical models
V.3.6 2D basin modeling of pore pressure and temperature
V.3.7 2D mechanical modeling
V.4 Model set-up and calibration from well data
V.4.1 2D seismic interpretation (TWTT)
V.4.2 2D lithofacies distribution in depth..
V.4.3 2D Basin modeling set-up
V.4.3.1 Porosity-permebaility relation
V.4.3.2 Boundary conditions
V.4.4 2D mechanical model set-up
V.5 Modeling results along profile A-B
V.5.1 2D restoration of SE Amazon Fan growth and deformation
V.5.2 2D basin modeling of pressure and temperature evolution
V.5.2.1 Present-day pore pressure
V.5.3 Temperature-driven fluid expasion mechanisms
V.5.3.1 Clay mineral transformation
V.5.3.2 Hydrocarbon gas genertaion
V.5.3.3 Present-day fluid expansion (unloading)
V.5.4 Evolution of deformation along the detachment and faults
V.6 Discussion
V.6.1 Pore pressure evolution in the southeast Amazon Fan
V.6.2 Overpressure mechanisms in the Amazon Fan
V.6.3 Implications for other deep-sea fans
V.7 Conclusions
