This paper presents a novel graphical enhancement technique that can be easily practiced to interpret reservoir fluid gradients with formation pressure-test data. The method has various applications including mapping reservoir fluid nature and trends, identifying formation pressure changes because of facies changes, or the presence of baffles or barriers, and compartmentalization; diagnosing fluid-contact levels and transition-zone intervals; quality control of data; and judging the reliability of gradient interpretation. The scatter-plotting technique is very useful, not only for real-time decision making at the well site during both wireline- and drillpipe-conveyed formation-tester operations, but also in routine data interpretation and reservoir studies with petrophysical logs, pressure, and fluid data.

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