As a proven technology, 4D seismic has become a key component in oil and gas field surveillance that provides areal monitoring of subsurface changes, such as fluid movement, compaction, undrained fault blocks, and bypassed hydrocarbon. To monitor rapid changes in fields that involve complex recovery schemes (e.g. injection), frequent 4D seismic is highly desirable. In recent years, we made great effort to develop low cost 4D technologies to realize practical frequent reservoir monitoring. The field trial results and deployment examples are shared, and opportunities for further improvement are discussed in this paper.


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