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There are some production analysis techniques based on long-term production flowrate and bottomhole pressure data readings which can reveal the size of the actual petroleum reservoir (see for example Multiwell Retrospective Testing)The actual petroleum reservoir is always constrained in volume but in most practical applications the observation time is too short to see the effects of the reservoir boundaries (see ).
See Also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology
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