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Case Study: Probabilistic Model Helps Petrobras Decide Rapidly on Crucial Campos Basin Evaluation
“Interactive Petrophysics enabled Petrobras to quickly obtain accurate results of the preliminary petrophysical analysis in one hour compared to one day with the previous workflow. Company time and money was saved in the office and at the rig site.”
Carlos Afonso DeAndre,
Geologist,
Petrobras
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Challenge
Petroleo Brasileiro S.A. (Petrobras) uses volumetric analysis as an integral part of operations in the exploration and evaluation of blocks. Preliminary deterministic estimates must be accurate and fast to obtain the best log interpretation and guide the final probabilistic analysis of the wells.
Solution
For quicker volumetric analysis, Petrobras chose Interactive Petrophysics log analysis software, a practical, user-friendly, and interactive interface for log estimation. Once volumes were defined, the results represented a deterministic analysis of the well. These results went into the GeoFrame integrated reservoir characterization system ELANPlus advanced multimineral log analysis as a basis for the probabilistic model.
Results
Well interpretation turnaround time was reduced from days to around one h per well. This saved time and therefore money at the rig site and the office.
Speedier interpretation workflow
Petrobras uses volumetric analysis as an integral part of operations in both the exploration and evaluation of blocks. These evaluations help the asset team decide whether or not to proceed with further new areas of interest and the acquisition of exploration blocks for Petrobras and joint ventures. The evaluations are also delivered to the National Petroleum Agency (ANP) for review. The preliminary deterministic estimates need to be accurate and fast for the team to obtain the best log interpretation and, if needed, guide the final probabilistic analysis of the wells.
This is especially crucial for the evaluations being performed on the Campos basin that produces up to one million bbl per day, where rapid decisions are required. The Petrobras interpretation workflow was not providing results quickly enough and it lacked automated remodeling and interactive capabilities. As a result, it was necessary to rerun the full workflow to see new results.
Integrated log analysis software
For quicker volumetric analysis, Petrobras chose to use Interactive Petrophysics log analysis software, a practical, user-friendly, and interactive interface for log estimation. The PC-based software accelerates reservoir property evaluation by making the selection of almost all parameters interactive, just by using the mouse. The ability to perform “quick look analysis” is an integral part of the Petrobras interpretation workflow.
Petrophysical analysis is easier and more precise with software providing the integration of cross plots, histograms, and log charts. Petrobras uses Interactive Petrophysics software to better understand zones of interest in the initial analysis of the well data.
While changing the parameter selections interactively, models can be interpreted instantly, and all plots can be recalculated and updated, including composites, cross plots, histograms, and report screens. Results are instantaneous and the team saves valuable time.
Petrobras chose Interactive Petrophysics because of its speed, easy-to-use interface, and integrated workflow. All the analysis can be performed, from editing to the summation of the volumetric calculation model, using one module.
Once volumes are defined, the results represent a deterministic analysis of the well. These results can then be taken into the GeoFrame integrated reservoir characterization system ELANPlus advanced multimineral log analysis as a basis for the probabilistic model.
Substantial time saved
Petrobras chose Interactive Petrophysics to produce accurate results fast. Its ease of use and portability took the interpretation workflow to a new level. Well interpretation turnaround time was reduced from days to around one h per well. This, in turn, saved time and therefore money at the rig site and in the office.
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