The SPE Textbook Series #8 reservoir book (Towler) uses different MBE terminology. No matter what you use personally, be familiar with Expansion (Et) and Withdrawal (Fo) terms (included in the GB on 13 RES 3 below):
These terms are often used for MBE line plots. There are lots of possible plot types.
For example, F/Et vs We/Et creates a straight line. Note Et is in both denominators; therefore Et measurement error would still produce a line.
Not so regarding We (influx) or F (withdrawal). When these are in error, the line would curve. If We is low, the line turns up; if We is high, it turns down (follow the math). It's opposite for withdrawal (low, the line turns down, high, it turns up).
Most questions, however, revolve around the reservoir (e.g. influx) since we can't measure it directly.
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