--> Abstract: High Resolution Petroleum Systems Modeling in the Northern Campos Basin, Brazil: Prediction of Hydrocarbon Composition and Phase Behavior, by Robert G. Tscherny, Juliano M. Macedo, B. Wygrala, and M. R. Mello; #90039 (2005)

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High Resolution Petroleum Systems Modeling in the Northern Campos Basin, Brazil: Prediction of Hydrocarbon Composition and Phase Behavior

Robert G. Tscherny1, Juliano M. Macedo2, B. Wygrala3, and M. R. Mello4
1 IES Integrated Exploration Systems, Aachen, Germany
2 Petroinsight, Rio de Janeiro, Brazil
3 Integrated Exploration Systems, Aachen, Germany
4 HRT & Petroleum, Rio de Janeiro, Brazil

Petroleum Systems Modeling (PSM) tools can predict hydrocarbon composition, phase behavior and properties (e.g. API gravities and GOR's). The economic risk related to these predictions is a key aspect of PSM and therefore of great importance during the decision-making process. 3-phase, n-component petroleum migration modeling methods - in which phase and property calculations are made using flash calculations - are an essential requirement for improved predictions of petroleum phases and properties. Simple phase/component models, e.g. black-oil models cannot accurately handle the wide range of temperature-, pressure- and component mixture ratios that occur in Petroleum Systems. Recent advances in the development of kinetic parameters comprehend the Petroleum Type Organofacies Concept in which the organofacies are directly related to major petroleum types. This new concept is an extension of the Organic Facies Concept where the kinetic description (abundance and composition) is solely related to the depositional setting. Therefore, the implementation of the Petroleum Type Organofacies Concept facilitates modern PSM-tools to predict hydrocarbon composition and phase behavior more precisely. A 3D Exploration model of the northern Campos (including geological, geochemical and geophysical data) is used to illustrate, on the one hand, data requirements and, on the other hand, the applied workflow for hydrocarbon composition prediction and phase behavior related quality assessment. The Campos Basin provides the ideal framework for this integrative approach since numerous sets of geochemical data allow insights into the degree of maturation, mixture, source type. This will provide useful calibration with compositional models and “quality” refers to the degree of confidence of the actual data.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005