Nowadays the most efficient method for quantitative log interpretation calls for an integration of all the information available (logs, cores, well tests) which is then synthesized and homogenized. This allows obtaining more and more reliable and detailed values concerning the lithological, petrophysical parameters and, thence, the internal structure of the reservoir.

As a consequence, it is fundamental to unify all the log and core information into a global data base taking into account both the qualitative (lithology) and quantitative (petrophysical parameters) data.

To reach this target, it is essential to start from a detailed lithological analysis and to have the availability of a number of logs sufficient to discriminate and, thence, quantify all the mineralogical components defined by means of core analysis.

For this purpose a model based on a linear programming algorithm for the quantitative interpretation has been conceived so as to evaluate all the characteristics highlighted by the quantitative analysis.

Applications of this methodology to complex lithologies are shown in several examples. Emphasis is given to a detailed analysis of the advantages of this methodology, that is:

  • unification of all the log and core information into a single interpretative process.

  • Adaptability of the program to all log sets and local conditions.

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