| Popis: |
In reservoir management, accurately measuring remaining oil saturation and monitoring its change with time are conducted with time-lapse reservoir monitoring, including production logs and reservoir saturation logs.Interpreting these reservoir-monitoring logs requires advanced knowledge of multi-disciplines in petroleum engineering.Formation evaluation is dynamic, and data integration is a critical step of the evaluation.Dynamic petrophysics provides the basis for engineers to make critical reservoir-management decisions, such as water shut-off.In this paper, examples of time-lapse reservoir monitoring are shown to demonstrate the concept of dynamic petrophysics for a well, from initial openhole formation evaluation to intermittent and late-stage, time-lapse reservoir monitoring.All reservoir-monitoring logs were run through production tubing and logged across openhole or casedhole reservoir intervals. Formation water salinity, mixed with different injected waters, was characterized with bottomhole and surface samples.Resistivity logs were interpreted considering both drainage and imbibition petrophysics.Resistivity and carbon-oxygen logs were integrated to provide final oil saturation. Results of this study show that residual oil in water-swept intervals is very low, indicating excellent sweep.In summary, dynamic petrophysics, based on time-lapse reservoir monitoring, is the basis of reservoir management. Integration of petrophysical, geological, reservoir, and production data is the key to successful dynamic reservoir diagnostics. |
