--> ABSTRACT: Integrated Rock, Log and Seismic Studies Applied to Carbonate Reservoir Characterization, a Brazilian Experience, by Dillon, Lucia D.; Schwedersky Neto, Guenther; Nunes, Cassiane; Abreu, Elita; #90135 (2011)

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Integrated Rock, Log and Seismic Studies Applied to Carbonate Reservoir Characterization, a Brazilian Experience

Dillon, Lucia D.1; Schwedersky Neto, Guenther 1; Nunes, Cassiane 1; Abreu, Elita 1
(1)EXPLORATION, PETROBRAS, Rio de JANEIRO, Brazil.

For the last years, as a result of the new discoveries of Albian and pre-salt Aptian carbonates, an exceptional programme of systematic and integrated Rock-Log-Seismic studies has been developed within PETROBRAS. These studies involve interdisciplinary technical teams, bringing together specialists from petrology, sedimentology, petrophysics and rock physics as well as geophysicists and geologists from the target fields.

In this context, the focus of this work will be what we call "Petroseismic - Petrophysical Integrated Work". We propose to discuss some of the most relevant aspects of our efforts to interpret seismic attributes to improve reservoir characterisation, translating the attributes into probabilities of occurrence of reservoir petrophysical properties such as porosity, reservoir quality (facies), and fluids.

An extensive rock coring programme to sample the new carbonate reservoirs is being developed by PETROBRAS. Several experiments and integrated lab analyses focusing on the rock scale are being held to calibrate our rock physics empirical and theoretical modelling correlations, as well as for comparison with other information already available in literature. Due to the important role played by diagenesis, experiments focusing on rock - fluid interactions are also being performed.

A data bank integrating the Rock scale and Log information and correlating and calibrating the petroseismic information is being developed for the new carbonate reservoirs. The calibrated models and correlations of the reservoir petrophysical properties are the basis for the interpretation of elastic seismic attributes. For those plays, however, the processing of elastic seismic attributes is a big challenge by itself, and efforts are being made to acquire state of art data preconditioning and inversion technologies.

Integrated studies and a data bank for the new carbonate reservoirs are being developed by PETROBRAS. For all scales of geophysical observation: lab experiments, well logs and seismic attributes, we confirmed that elastic seismic attributes can be successfully employed to improve reservoir characterisation. However, due to the big challenges related to the very complex intrinsic aspects of the carbonate reservoirs, we believe that a lot of further studies and experiments must take place. There still a lot to be understood, generating a huge open field for research.

 

AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.