| Popis: |
Offshore Pre-salt carbonates are the most relevant assets in Brazil. Since they have only been in production for the last two decades, their petrophysical characterization is of utmost importance to build reservoir models that can effectively estimate reserves and forecast production. The rock and fluid complexity of these carbonates increase the timeline and uncertainty of special core analysis programs. In this context, innovative technologies, such as digital rock analysis, can support and strengthen the petrophysical characterization of this challenging carbonates. In this work, we propose a methodology based on petrophysical trends to improve the definition of representative digital volumes of a reworked carbonate sample from the Pre-salt. In addition, digital static and dynamic properties were simulated at the pore scale and then upscaled for the whole plug. The porosity, permeability, formation factor and capillary pressure results showed a positive match with laboratory mercury injection capillary pressure and routine core analysis. The upscaling procedure was key to capture the dominant features at both the micro (pore) and macro (plug) scales commonly found in complex carbonate rocks. This workflow optimized the use of rock and fluid samples, reduced the timeline of the special core analysis program to 60% and supported minimizing the uncertainty of the traditional laboratory programs by improving quality control. |
