4D seismic is a valuable tool for reservoir monitoring and improved reservoir management. With the introduction of intelligent completion systems arizes the opportunity of a continuous monitoring of the near wellbore formations from the well. Future intelligent well completions may include high-frequency downhole source and sensors to be utilized for active and passive seismic reservoir monitoring. The advantage of such a system lies in its excellent repeatability and high resolution, resulting in more sensitive and detailed reservoir observation and formation evaluation. Specific benefits are monitoring of fluid/gas contact zone movements as gas/water coning, improved reservoir characterization, and optimization of reservoir drainage. Finite difference seismic modeling was performed to illustrate the advantages and challenges related to continuous in-well reservoir monitoring. The reservoir model was based on log, core and production data, as well as geological information. Rock physical calculations were performed to relate expected variations of reservoir pore fillings to changes in seismic properties. The time-lapse seismograms reveal important features of high-frequency seismic monitoring. Due to high repeatability even small changes in seismic contrast can be resolved at a small scale, hence in-well seismic data provide detailed reservoir information to be combined with conventional 4D seismic results. Moreover, new processing requirements are identified.
Integrating seismic monitoring and intelligent wells
2000
8 Seiten, 8 Quellen
Aufsatz (Konferenz)
Englisch
Europäisches Patentamt | 2020
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