--> Abstract: The Integration of Tectonics and Earth System Modeling to Reduce Risk in Frontier Exploration in the South Atlantic—the Fundamental Importance of the Tectonic Model? by John M. Jacques and Paul J. Markwick; #90039 (2005)

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The Integration of Tectonics and Earth System Modeling to Reduce Risk in Frontier Exploration in the South Atlantic—the Fundamental Importance of the Tectonic Model?

John M. Jacques and Paul J. Markwick
Getech, Leeds, United Kingdom

This paper focuses on the fundamental importance of using high-quality potential field data (gravity and magnetics) for developing a plate tectonic model for South Atlantic opening that can be used to gain an invaluable insight into the most fundamental issues surrounding the petroleum systems of its passive margin basins, particularly for frontier areas with limited seismic and well data. By integrating numerous geological disciplines with GIS technology, we can identify new and extend existing play fairways in these frontier areas and, when combined with GIS-based state-of-the-art techniques, such as ‘Earth System Modelling' (palaeoclimate-ocean modelling, and drainage analysis), a powerful exploration tool is created for predicting the contemporary distribution of play elements (source, reservoir and seal). However, the reliability of such modelling is greatly dependant on a thorough understanding of the tectonic evolution of the region, especially its influence on the dynamics of each basin (subsidence and uplift) and its associated landscape evolution (hinterland uplift, palaeodrainage, and sediment input). This, in turn, defines palaeogeography, which provides an essential constraint for understanding source rock, reservoir and seal distribution and quality at all scales.

We highlight the importance of evaluating alternative geological models, and integrating high-quality gravity and magnetic data with other geological datasets (e.g., seismic, well and outcrop) to thoroughly constrain tectonic and structural interpretations; thus ensuring that the resultant plate tectonic model is as robust as the data we have will dictate, and the ensuing modelling techniques employed will take us closer to reducing uncertainty and exploration risk in frontier areas.

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