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Seismic-Based Salt Characterisation for Geomechanical Modelling of a Presalt ReservoirNormal access

Authors: L. Teixeira, J.P. Nunes, A. Maul, J. Fonseca, P. Barros and F. Borges
Event name: 80th EAGE Conference and Exhibition 2018
Session: Geopressure
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801331
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.7Mb )
Price: € 20

Summary:
Salt tectonics contribute to create a suitable environment for oil migration and trapping and, consequently, the salt-rich basins are present in many of the most prolific oil and gas provinces in the world. Under high pressures and temperatures, salt can deform and flow during a short period. Hence, the geomechanical characterization of these rocks cannot be neglected during field development studies. Typically, the reservoir pore pressure changes during injection and production. Such changes in the reservoir pressure lead to modifications in the stress state of both the reservoir and its encasing rocks. The building of a geomechanical model requires a multitude of rock mechanical data, such as poisson ratio, Young modulus, density, cohesive strength and so on. Seismic inversions are natural candidates to estimate the elastic property variation of subsurface. We will present a seismic-driven geomechanical characterization of a presalt carbonate reservoir. We propose to assess the elastic property of salt rocks applying rock-physics analysis and seismic inversion. Along with the flow simulation, seismic-derived elastic estimation is coupled to refine the geomechanical simulator.


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