This report presents the petroleum system analysis and 3D basin modeling integration of the Southern Espírito Santo area, which will allow better knowledge of associated petroleum exploration risks in this complex offshore Southeastern Brazilian Margin area. It provides to all geoscientists a rich 3D model based on geological and geophysical interpretations, combined with high resolution molecular geochemistry of reservoir oils and source rocks. The work is based on a set of 20 crude oils and 17 control wells, used for modeling and source rocks/oil correlations and of course in depth geochemical characterization of the organic matter.

In an area with an important structural trend that subdivides the Espírito Santo Basin into compartments, the southern area is unusually complicated and yet this 3D modeling has provided a unique view of the geological history of the active petroleum systems. The data unravel the presence of both lacustrine and marine organic rich sediments that have generated hydrocarbons in the basin. The study traces the reconstruction and fill/spill history of traps, provides mass balance to estimate hydrocarbon volumes and prediction of oil type, and foreseeable mixing of marine and lacustrine oil types. Molecular geochemistry brings clear evidences that mixed pulses of varying thermal maturities of hydrocarbons have filled reservoirs in successive time events. As a complement to the geochemical characterization, the study provides explanations for the depth/temperature related issues that have complicated the preservation of the oil quality in specific areas.

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1. Introduction
2. Geologic Assessment of the Study Area
   1. Regional Context: the Great Campos Basin
   2. Tectonic-Stratigraphic Appraisal and Mapping
   3. Exploration History
3. Source rocks, Oils and Condensates
   1. Introduction
   2. Source Rocks Characterization
   3. Hydrocarbons characterization
4. Accumulation Models and Leads Characterization
5. 3D Petroleum System Modelling
   1. Introductory information
   2. Building the Model (INPUT)
   3. Maturity and Pressure Modeling Results
   4. Petroleum Migration
   5. Play Analyses
6. Conclusions
7. References