Author(s)

M. Stundner, G. Zangl & F. Komlosi

Abstract

A thorough analysis of hydrologic pumping tests requires the knowledge about the flow regimes in order to employ the right analysis method. A two step approach to the analysis process is recommended that offers the possibility of a precise definition of each flow regime. A qualitative surveying should precede the quantitative analysis of a pumping test using conventional straight line and type-curve matching techniques. This diagnostic step is based on the representation of the drawdown together with the derivative of the drawdown with respect to the natural logarithm of time. Within the petroleum sciences the practical use of this technique was mainly pioneered by D. Bourdet. The theoretical principles and application of the derivative plot, its inherent advantages and practical considerations concerning its proper use will be d

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