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| Author(s): |
Rafael Medeiros de Souza
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica |
| Defense date: | 2010-09-15 |
| Examining board members: |
Denis José Schiozer;
Emilson Pereira Leite;
Alvaro Favinha Martini
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| Advisor: | Denis José Schiozer |
| Abstract | |
The use of production data for increasing the reliability of production forecasts of a field is limited, especially in early development, when there are fewer observed data and the uncertainties are greater. An alternative to improve the quality of the model is the use of saturation and pressure maps obtained from time-lapse seismic. The incorporation of this information is not explored in reservoir engineering studies and hás great potential for reducing uncertainties caused by lack of information and complexity of oil fields. Recent work indicates that the best way to use this information to calibrate numerical models of reservoirs is to convert it to saturation and pressure. Thus, the objective of this study is to obtain, from time-lapse seismic data, the distributions of saturation and pressure over oil reservoirs. The presented methodology consists of the definition of two methods. In Method 1, the saturation is implicitly obtained through an inversion process constrained by reservoir engineering data. Thus, the pressure is explicitly obtained with the application of map saturation in the history matching process (SOUZA et al., 2010). This method was applied to a five-spot model with two faults and a high permeability channel. The saturation and pressure maps obtained clearly indicate the reservoir structures that define fluid flow trends in the reservoir. These results indicate that the iterative method was effective to overcome pressure modeling difficulties in the reservoir acoustic response. Furthermore, it's highlighted the use of reservoir simulation information, such as the well liquid rate matching and the iterative approach between the inversion and matching process in order to decouple the contributions of saturation and pressure in the reservoir acoustic response composition. In Method 2, the saturation and pressure maps are obtained simultaneously through the inversion process constrained by engineering data. This method was applied to a modified model of the "Namorado Field" (Campos Basin, Brazil), that hás geological faults and high permeability channels. It was also necessary to apply na empirical modeling of the rock bulk modules as pressure functions (EMERICK, 2007). This improved the reservoir acoustic sensitivity and allowed, together with the engineering data constraints, obtain these maps. It was possible to identify the main structures that can set fluid flow trends in the reservoir.As major contributions of this study are the developments of a methodology able to provide saturation and pressure trends regarding time-lapse data and engineering data constraints to the overall process (AU) | |
| FAPESP's process: | 07/06146-6 - Use of 4D Seismic to Improve Oil Field Development Reliability |
| Grantee: | Rafael Medeiros de Souza |
| Support Opportunities: | Scholarships in Brazil - Master |