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Derivative with respect to the natural logarithm of the argument (see Fig. 1):
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\frac{dp}{d(\ln t)} = t \, \frac{dp}{d t} |
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In Well Testing applications the logarithmic derivative is often denoted as
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See
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also
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Formal science / Mathematics / Calculus
[ Logarithmic Derivative @model ]
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing / Pressure Transient Analysis (PTA) / PTA Diagnostic Plot
[ Well & Reservoir Surveillance ] [ Pressure Diffusion ] [ Pressure log-log plot ][ Logarithmic Derivative @model ]